ĐỒ ÁN BTCT 2

GVHD: HONG THIN TON SVTH: NGUYN HNG TM

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H KIN TRC TP. H CH MINH THUYT MINH N B TNG CT THP 2

1

PHN 1: THUYT MINH TNH TON ............................................................................................. 6

I. GII THIU CHUNG ........................................................................................................... 6

1. S lc v cng trnh ............................................................................................................... 6

2. S liu n ............................................................................................................................ 6

II. LA CHN GII PHP KT CU .................................................................................... 7

1. Gii php vt liu ..................................................................................................................... 7

1.1. B tng ............................................................................................................................. 7

1.2. Ct thp............................................................................................................................ 7

2. Ni ct thp ............................................................................................................................. 7

3. Gii php kt cu cho sn, mi ................................................................................................. 8

3.1. Gii php kt cu sn ........................................................................................................ 8

3.2. Gii php kt cu mi ......................................................................................................... 10

3.3. Chn kch thc cc cu kin ca sn, mi ......................................................................... 10

3.3.1. S b kch thc sn ................................................................................................... 10

3.4. La chn gii php khung ............................................................................................... 13

3.5. La chn s b kch thc tit din cc cu kin ............................................................ 14

3.5.1. Tit din dm khung ............................................................................................... 14

a. Dm BC (dm trong phng) ........................................................................................ 14

b. Dm AB,CD (dm ngoi hnh lang) ........................................................................... 15

c. Dm dc nh .............................................................................................................. 15

3.5.2. S b tit din ct ................................................................................................... 15

a. Ct trc B,C ............................................................................................................... 17

b. Ct trc A,D ............................................................................................................... 18

3.6. Mt bng kt cu sn tng in hnh, sn mi .................................................................. 19

3.6.1. Mt bng kt cu sn tng in hnh ........................................................................ 19

III. S KT CU KHUNG PHNG .................................................................................. 21

1. S hnh hc (s kt cu thc) ........................................................................................ 21

2. S kt cu.......................................................................................................................... 22

2.1. Nhp tnh ton ca dm ................................................................................................... 22

2.2. S kt cu khung ....................................................................................................... 24

IV. XC NH TI TRNG N V ...................................................................................... 25

1. Xc nh ti trng phn b trn sn, mi ................................................................................. 25

1.1 Sn tng in hnh. ......................................................................................................... 25

1.2 Vi sn trong phng ....................................................................................................... 26

1.3. Vi sn hnh lang ........................................................................................................... 27


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1.4. Vi sn v sinh, nh bp .............................................................................................. 27

1.5. Sn mi .......................................................................................................................... 28

2. Tnh ti n v ........................................................................................................................ 28

3. Hot ti n v ....................................................................................................................... 29

4. H s quy i ti trng ........................................................................................................... 29

V. XC NH TI TRNG TNH TC DNG VO KHUNG ............................................ 29

1. Tnh ti tng in hnh: 2,3,4 .................................................................................................. 29

1.1. Ti trng phn b ........................................................................................................... 29

1.1.1. Ti trng tnh truyn t bn sn ln dm khung ....................................................... 29

1.1.2. Trng lng bn thn dm khung ............................................................................ 31

1.1.3. Ti trng tng ngn xy trn dm khung ............................................................... 31

1.2. Ti trng tp trung .......................................................................................................... 31

1.2.1. Ti trng tp trung do sn truyn vo dm ............................................................... 31

1.2.2. Trng lng tng xy trn dm dc ...................................................................... 32

2. Tnh ti tng mi .................................................................................................................... 35

2.1. Phn mi bng AB .......................................................................................................... 35

2.2. Phn mi dc BCD ......................................................................................................... 36

3. S tnh ti tc dng ln khung ............................................................................................ 39

VI. XC NH HOT TI TC DNG LN KHUNG ......................................................... 40

1. Hot ti cht y .................................................................................................................... 40

1.1. Tng in hnh (tng 2,3,4) ................................................................................................. 40

1.2. Hot ti cht y tng mi .............................................................................................. 42

1.2.1. Phn mi bng ........................................................................................................ 42

1.2.2. Mi dc .................................................................................................................. 43

2. Trng hp hot ti 1 ............................................................................................................. 45

1.1. Tng 2,4 ......................................................................................................................... 45

1.2. Tng 3 ............................................................................................................................ 47

1.3. Tng mi ........................................................................................................................ 48

2. Trng hp hot ti 2 ............................................................................................................. 50

2.1. Tng 2,4 ......................................................................................................................... 50

2.2. Tng 3 ............................................................................................................................ 51

2.3. Tng mi ........................................................................................................................ 53

2.3.1. Mi bng ................................................................................................................ 53

2.3.2. Phn mi dc .......................................................................................................... 54

3. S hot ti tc dng vo khung .......................................................................................... 55


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VII. XC NH TI TRNG GI TC DNG LN KHUNG ............................................... 58

1. Phn b gi dc theo chiu cao khung. ................................................................................... 58

2. Phn ti trng gi tc dng ln mi ......................................................................................... 59

3. S gi tc dng ln khung ................................................................................................. 60

VIII. T HP TI TRNG ......................................................................................................... 62

1. nh ngha cc trng hp ti trng ....................................................................................... 62

2. Cc t hp c bn .................................................................................................................. 62

2.1. T hp c bn 1 .............................................................................................................. 62

2.2. T hp c bn 2 .............................................................................................................. 62

2.3. T hp c bit .............................................................................................................. 63

3. Biu bao momen khung trc 3 ........................................................................................... 63

4. Biu bao lc ct khung trc 3 ............................................................................................ 64

5. Biu lc dc trong ct ....................................................................................................... 65

6. nh s cc cu kin trong khung .......................................................................................... 66

7. Bng kt qu ni lc trong khung ........................................................................................... 67

7.1. Ni lc trong dm D200x450, phn t s 14 ................................................................... 67

7.2. Ni lc ct C200x450, phn t s 9 ................................................................................ 68

IX. TNH TON CT THP CHO DM KHUNG ................................................................. 69

1. Tnh ton v chn ct dc cho dm......................................................................................... 69

1.1. Tnh ton ct thp dc cho dm tng 2, nhp BC, phn t 14 (bxh=200x450 mm) ........... 69

1.1.1. Tnh ct thp cho gi B v C (momen m) .............................................................. 69

1.1.2. Tnh ct thp cho nhp BC (momen dng) ............................................................. 70

1.2. Tnh ton ct thp dc cho dm tng 2, nhp AB, phn t 5 (bxh=200x350 mm) ............. 71

1.2.1. Tnh thp cho gi B (momen m) ............................................................................ 71

1.2.2. Tnh thp cho gi A (momen m):........................................................................... 72

1.2.3. Tnh ct thp chu momen dng ............................................................................ 72

2. Tnh ton v b tr ct ai cho dm ......................................................................................... 76

2.1. Tnh ton ct ai cho phn t 14, tng 2 nhp BC (bxh=200x450mm) ............................. 76

2.2. Tnh ton ct ai cho dm 15,16, nhp BC (bxh=200x450) .............................................. 78

2.3. Tnh ton v b tr ct ai cho dm 5, nhp AB (bxh=200x350) ...................................... 78

2.4. Tnh ton v b tr ct ai cho phn t dm 6,7,8,22,23,24 (bxh=200x350mm) ............... 81

2.5. i vi dm mi, phn t dm 17,25,30 (bxh=200x350) ................................................. 81

3. Tnh ton v chn ct treo ...................................................................................................... 81

3.1. Tnh ct treo ti nt k (giao dm dc v dm khung phn t 10)...................................... 81

X. TNH TON V B TR THP CT ............................................................................... 82


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1. Vt liu s dng ..................................................................................................................... 82

2. Tnh ton ct thp cho phn t ct 9 (bxh=200x450mm) ........................................................ 82

2.1. S liu tnh ton ................................................................................................................. 82

2.2. Tnh thp i xng cho cp ni lc 1 .............................................................................. 83

2.3. Tnh thp cho cp ni lc 2 ............................................................................................. 84

2.4. Tnh thp cho cp t hp ni lc 3 .................................................................................. 85

3. Tnh ton ct thp cho phn t ct 11 (bxh=200x350mm) ...................................................... 85

3.1. S liu tnh ton ................................................................................................................. 85



3.4. Tnh thp cho cp t hp ni lc 3 ................................................................................. 88

4. Tnh ton ct thp cho phn t ct 1 (bxh=200x350mm) ........................................................ 88

4.1. S liu tnh ton ............................................................................................................. 88



4.4. Tnh thp cho cp t hp ni lc 3 .................................................................................. 95

5. Tnh ton ct ai cho ct ........................................................................................................ 96

XI. KIM TRA CHUYN V CA DM KHUNG ................................................................. 98

1. Kim tra iu kin chuyn v ngang ca khung ....................................................................... 98

2. Tnh chuyn v ti v tr gia nhp cc dm khung, .................................................................. 99

2,1, c trng vt liu ........................................................................................................... 99

2.2. Kim tra iu kin hnh thnh khe nt .......................................................................... 100

2.3. Xc nh vng ca dm ............................................................................................ 101

2.4. Kim tra chuyn v ca u console .............................................................................. 107

XII. TNH TON V CU TO CC NT ........................................................................... 109

1. Nt lin kt ct bin vi dm mi ......................................................................................... 110

1.1. Nt lin kt ct bin vi dm mi nt A ..................................................................... 110

1.2. Nt lin kt ct bin v dm mi nt E ....................................................................... 111

2. Cu to nt lin kt ct gia v dm mi .............................................................................. 112

3. Cu to nt lin kt gia ct gia v dm tng in hnh ...................................................... 113

3.1. i vi nt c tit din ct khng i, dm c tit din thay i ................................... 113

3.2. i vi nt c tit din dm, v ct u thay i ........................................................... 114

4. Cu to nt lin kt gia ct bin v dm tng in hnh ....................................................... 115

5. Cu to nt lin kt chn ct vi mng ................................................................................. 116

XIII. XC NH CC CH TIU KT CU ........................................................................... 117


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1. Thng k ct thp khung ...................................................................................................... 117

2. Ch tiu v ti trng .............................................................................................................. 118

3. Ch tiu v vt liu ............................................................................................................... 119

PHN 2: NI DUNG NNG CAO................................................................................................... 120

I. t vn ........................................................................................................................... 120

II. TNG QUAN V BNH V TUI TH CA CNG TRNH ..................................... 120

1. Sa cha, ci to, nng cp cng trnh .................................................................................. 120

2. S lm vic ca cng trnh ................................................................................................... 121

3. nh gi tnh trng, tui th ca nh .................................................................................... 123

4. Trnh t bo tr, sa cha cng trnh xy dng ...................................................................... 124

III. KHO ST, SA CHA KT CU B TNG CT THP ......................................... 124

1. Cng tc kho st ti hin trng.......................................................................................... 124

2. Cc loi vt nt v nguyn nhn ........................................................................................... 125

3. Phn tch nh gi c ch xung cp, h hng cng trnh ..................................................... 127

4. Cc h hng thng gp trong kt cu khung b tng ct thp .............................................. 129

5. Mt s phng php sa cha vt nt trong b tng ............................................................. 133

IV. CC BIN PHP GIA CNG KT CU KHUNG B TNG CT THP (DM & CT) ............................................................................................................................................ 134

1. Gia cng tit dm bng cch m rng tit din vng chu ko ............................................. 135

2. Gia cng ct chu nn lch tm bng cch tng tit din v mt pha .................................. 138

3. Gia cng dm bng thanh cng ng sut trc .................................................................... 142

V. TNH TON THC HNH .............................................................................................. 145

1. Gia cng dm bng cch tng tit din vng chu ko. ........................................................ 145

2. Gia cng ct chu nn lch tm bng tng tit din v mt pha .......................................... 148

3. Gia cng dm bng thanh cng ng sut trc .................................................................... 153

VI. KT LUN ........................................................................................................................ 158

VII. TI LIU THAM KHO .................................................................................................. 159


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PHN 1: THUYT MINH TNH TON

I. GII THIU CHUNG

1. S lc v cng trnh

Cng trnh l nh x hi (nh cho thu) vi chc nng: tng 1 l cc phng a

nng (cu lc b,phng lm vic, phng sinh hot cng ng,), t tng 2 n tng 4 l

nh cho gia nh nh hoc cn h c thn.

2. S liu n

M

s

Nhp

1( )L m

Nhp

2 ( )L m

Nhp

( )cL m

Chiu

cao

1( )h m

Chiu

cao

( )th m

Chiu

cao

( )h m

Bc

khung

( )B m

S

tng

( )N

a

im

XD

Ghi

ch

46 1.8 6.0 1.0 3.9 3.3 0.5 3.9 4.0 H

Ni


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II. LA CHN GII PHP KT CU

1. Gii php vt liu

1.1. B tng

B tng cp bn 20B : 11,5bR MPa 0,9btR MPa 327.10bE MPa

1.2. Ct thp

STT Loi thp c tnh/ kt cu s dng

1 Thp ( 10)AI 225 s scR R MPa 6175 ; 2.1.10sw sR MPa E MPa .

Ct thp c 10 mm

2 Thp 10) (AII 280 s scR R MPa 6225 ; 2.1.10sw sR MPa E MPa .

Ct thp dc kt cu cc loi c

10mm

2. Ni ct thp

Khi chiu di thanh thp khng hoc qu di gy tr ngi cho thi cng, ta s

dng bin php ni ct thp. S dng si thp 1 ni chng (ni buc) hai ct thp li

vi nhau. Hai u thanh ct thp chp vo nhau mt on anl .

Hnh: Cch buc ct thp

Chiu di on ni buc anl c xc nh bng cng thc:

( )san an anb

Rl

R .

Cc gi tr ,an an tra bng ty vo iu kin lm vic ca ct thp.

lan

1

2


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3. Gii php kt cu cho sn, mi

3.1. Gii php kt cu sn

Vic la chn gii php kt cu sn hp l l vic lm rt quan trng, quyt nh

tnh kinh t ca cng trnh.

Theo thng k th khi lng b tng sn c th chim 30% 40% khi lng b tng ca cng trnh.

Trng lng ca b tng sn tr thnh mt loi ti trng tnh chnh. Cng trnh cng cao th p lc xung ct v mng cng ln, lm tng chi ph mng

ct.

Tng ti trng ngang do ng t. la chn gii php kt cu sn ta so snh mt s u nhc im ca mt vi gii php.

Gii php kt cu sn u im Nhc im

Sn panen lp ghp

(mt bng n gin, bc

ct u v >4m)

Sn xut cng nghip, chi

ph thp, khng tn

coppha, thi cng nhanh

chng.

Khng dng cho mt bng

a dng, cng tng th

nh, chi tit cu to phc

tp

Sn khng dm (sn

nm)

Gim c chiu cao kt

cu, thi cng coppha n

gin, b tr ct thp d

dng, khng gian kin trc,

ni tht a nng, p hn

Khi chu ti trng ng, bn

sn c th b ph hoi theo

iu kin chc thng, do

sn phi c chiu dy ln

hoc thit k m ct m

bo iu kin chng xuyn

thng. Trong phng n

ny, cc ct khng c lin

kt vi nhau to thnh h

khung nn cng tng th

s nh hn so vi phng


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sn sn dm, kh nng chu

ti ngang cng km hn so

vi sn c dm.

Hm lng ct thp trong

sn nm thng ln hn sn

c dm, v vy phi tnh

ton k nu mun m bo

kinh t.

Kh thay i kt cu khi

cn, v d nh mun lm

cu thang cn phi c l v

tnh ton cn thn,.

vng ln

Sn sn ton khi (sn

dm)

**Loi khng c dm ph

(b tr dm qua ct, khng

c cc dm ph)

Thi cng thun tin, c th

khng cn trn hoc ng

trn d dng

Vi khng gian kin trc

ln, li ct t 6, 0 6,0m m

cho n 9,0 9,0m m th

chiu dy sn ln, tng chi

ph b tng, thp, thng t

kinh t, phi khng ch iu

kin vng

Sn sn ton khi (sn

dm)

**Loi c dm ph

Chiu dy sn c th nh

li, d m bo iu kin

vng, chi ph vt liu

gim

Thi cng kh khn hn,

tng chi ph coppha, khi cn

thit th phi ng trn

p ng yu cu kin trc


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Kt lun:

Chn gii php sn sn ton khi, c b tr h dm ph, dm khung (dm chnh, dm ph gc ln dm chnh cng vi kt cu (kt cu ng) to thnh h khung.

Ta b tr mt dm ph trong on t trc B n trc C.

Bin php thi cng: Ct, dm, bn sn, bn mi, u thi cng bng bin php ton khi.

3.2. Gii php kt cu mi

Kt cu mi: dng h mi l lp gch gi ngi lp ln lp b tng bn mi. Mi trong s gm hai b phn, mt phn mi bng v h mi chnh l mi

nghing.

dc ca mi: 2 1

2 10 1 1

6 1,8 39 4 8mhi

L L

. Vy mi c xem l mi dc.

V cu to ca mi gm: bn mi, dm ph (dm dc), dm mi chnh (dm khung). B tr mt dm ph trong on t trc B n trc C. Ti trc B c hai dm ph bn

mi, mt phn mi bng v mt dm ph bn mi nghing, on tng t mi bng

n mi nghing kt cu khi xy bng gch dy 200mm .

3.3. Chn kch thc cc cu kin ca sn, mi

3.3.1. S b kch thc sn

Chiu dy sn phi tha mn iu kin v bn, cng v kinh t. Chn s b chiu dy sn bng cng thc:

1 min

Dh L h

m

Tr s minh quy nh i vi tng loi sn:

min 4h cm i vi mi.

min 5h cm i vi sn nh dn dng.

min 6h cm i vi sn nh cng nghip.


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Tr s 0,8 1,4D ph thuc vo ti trng. y nh quy m 4 tng, ti trng tng i b, ta chn 1, 2D .

30 35m i vi bn loi dm. 40 45m i vi bn k 4 cnh.

Lp bng tnh chiu dy cho tng sn.


Hnh: S chia bn sn, sn tng in hnh

1 2 3 4 5 6 7 8

A

B

C

D

3900 3900 3900 39003000 3900

1800

3900

6000

26400

9600

1800

CAU THANG

S1 S1 S1 S1 S1 S1

S1 S1 S1 S1 S1 S1S2

S3 S3 S3 S3 S3 S3

S3 S3 S3 S3 S3 S3


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Bng 1: Bng gi tr s b chiu dy tng sn, sn tng in hnh

STT sn D m L1 hs hs chn

mm mm mm

1 S1 1,2 30 1800 72 90

2 S2 1,2 40 1800 45 90

3 S3 1,2 40 3000 75 90

Vi sn tng in hnh: chn s b chiu dy cho ton b sn l 90mm

Vi sn mi: do ti trng trn mi nh nn ta chn chiu dy sn b hn sn tng

in hnh. Chn s b 80sh mm .

3.4. La chn gii php khung

Ti trng ng gy ra chuyn v ngang b nn s cng lm vic ca cc khung

khng ng k, c th b qua tnh ton nh h gm cc khung c lp

Ti trng gi theo phng ngang nh gy ra p lc tnh, phn b u theo chiu

dc nh v ging nhau v quy lut phn b theo phng ng. Nu b qua nh hng

ca khung bin th c th coi chuyn v ca cc khung l ging nhau, c th tch khung

c lp, chu ti trng gi tc dng phn b ti cho khung.

S lng khung theo chiu dc nh kh ln, khung dc l khung kh cng nn momen do

ti trng ng, ti trng ngang theo phng dc b, c th b qua.

cng theo cc phng

3 34

3 34

26,4 9,61946,4( )

12 12 7,69,6 26,4

14719,8( )12 12

x

y x

y

LBI m

I IBL

I m

Do vy ta la chn gii php khung phng tnh ton


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3.5. La chn s b kch thc tit din cc cu kin

La chn s b kch thc tit din cc cu kin l iu kin cn t c hm

lng ct thp trong khung mt cch hp l, v khung l h kt cu siu tnh, ni lc ca

n ph thuc vo kch thc tit din.

3.5.1. Tit din dm khung

S dng cng thc: L

h km

Trong : :L nhp dm

m: h s 8 15m

:k h s ti trng, 1,0 1,3k

Kim tra iu kin thng thy theo yu cu kin trc:

Chiu cao dm ti a cho php: d T o oh h H , trong

:Th chiu cao ca tng 3,3Th m .

:oH chiu cao thng thy ti thiu theo yu cu kin trc 2,8oH m .

:o Khong thng b tr cc ni dung khc (thng gi, trn thch cao,),

0,05o m

Vy chiu cao dm ti a cho php: max 3,3 2,8 0,05 0,45d T o oh h H m .

a. Dm BC (dm trong phng)

Nhp dm: 2 6,0L L m . Chn s b chiu cao, b rng dm:

60001,1 440

15dh mm .


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m bo thng thy ta chn 450dh mm .

T ta chn b rng dm 200db mm .

Ta c maxd dh h tho yu cu thng thy theo kin trc.

Vi dm trn mi, do t trng nh nn ta chn chiu cao nh hn 400sh mm .

b. Dm AB,CD (dm ngoi hnh lang)

Nhp dm 1 1,8L L m .

Tnh s b chiu cao dm 1800

1, 2 21610d

h mm , nhng vic thay i chiu

cao dm trong phng v dm ngoi hnh lang khng xy ra t ngt, ta chn 400dh mm

vi 450 350

0, 22 22%450

h .

Chn s b b rng dm 200db mm .

c. Dm dc nh

Nhp dm 3,9L B m . S b chiu cao v b rng dm:

3900

1.1 30614d

Lh k mm

m . Chn 350dh mm .

B rng dm 200db mm .

3.5.2. S b tit din ct

Ct chu nn do ti trng ng v chu momen, ch yu do ti trng ngang, khi s

b tit din ct ta c nh b qua kh nng chu nn ca ct thp m ch xt n b tng.

Tit din ct A c s b nh sau:


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b

NA k

R

Trong : :N lc dc trong ct do ti trng ng, xc nh n gin bng tng

ti trng ng tc dng ln phm vi truyn ti vo ct.

k: h s, k n nh hng ca momen, 1,1 1,5k .

Hnh: Phm vi truyn ti ca ct

Ct trc B,C

Pham vi truyen tailen cot truc 2Pham vi truyen tailen cot truc 1

1 2 3

3900 3900


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Chn s b tit din ct b

NA k

R

Khng xt s phn bit ct bin, ct gia, ta ly 1, 2k cho tt c ct trc B,C.

i vi chung c thp tng, ta s b chn tng ti s b trn mt 2m sn:

2 21,2(T/ m ) 12( / )q kN m .

bR : cng chu nn ca b tng, i vi b tng 20B

3 211,5 11,5 10 ( / )bR MPa kN m .

Lc dc truyn ln ct: BN q S

a. Ct trc B,C

Ct Din truyn ti 2( )m Lc dc

truyn vo ct

( )BN q S kN

S b tit

din ct

2( )b

NA k cm

R

Tit din

ct

b h( )mm

Tit

din

ct

chn

2( )cm

1C 21 0,9 1,95 3 1,95 7,605S m 365,04 380,9 200x350 700

2C 22 0,9 3,9 3 3,9 15,21S m 547,56 571,4 200x450 900

3C 23 0,9 3,9 3 3,9 15, 21S m 547,56 571,4 200x450 900

4C 24 0,9 1,95 3 1,95 7,605S m 365,04 380,9 200x400 700

5C 25 0,9 1,95 3 1,95 7,605S m 365,04 380,9 200x400 700

6C 26 0,9 3,9 3 3,9 15,21S m 547,56 571,4 200x450 900

7C 27 0,9 3,9 3 3,9 15,21S m 547,56 571,4 200x450 900

8C 28 0,9 1,95 3 1,95 7,605S m 365,04 380,9 200x400 700


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Vi nhng ct c tit din 2571,4A cm ta chn ct c kch thc:

220 45 900b h cm .

Tng 1,2 tit din ct l 200 450( )b h mm .

Tng 3,4 thay i tit din ct: 200 350( )b h mm .

b. Ct trc A,D

Ch c ct gc, ct bin, ta chn h s 1,1k cho ct trc A,D.

Ct Din truyn ti 2( )m Lc dc

truyn vo ct

( )BN q S kN

S b tit

din ct

2( )b

NA k cm

R

Tit din

ct

b h( )mm

Tit

din ct

chn

2( )cm

1C 21 0,9 1,95 1,755S m 84,24 80,58 200x350 700

2C 22 0,9 3,9 3,51S m 168,48 161,15 200x350 700

3C 23 0,9 3,9 3,51S m 168,48 161,15 200x350 700

4C 24 0,9 1,95 1,755S m 84,24 80,58 200x350 700

5C 25 0,9 1,95 1,755S m 84,24 80,58 200x350 700

6C 26 0,9 3,9 3,51S m 168,48 161,15 200x350 700

7C 27 0,9 3,9 3,51S m 168,48 161,15 200x350 700

8C 28 0,9 1,95 1,755S m 84,24 80,58 200x350 700

Vi nhng ct c tit din 280,58A cm ta chn ct c kch thc:

220 35 700b h cm


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Vi nhng ct c tit din 2161,15A cm , ta chn ct c kch thc:

220 35 700b h cm .

Ct trc A,D tit din t tng 1,2 l 200 350( )b h mm n tng 3,4 l

200 250( )b h mm

3.6. Mt bng kt cu sn tng in hnh, sn mi

3.6.1. Mt bng kt cu sn tng in hnh


1 2 3 4 5 6 7 8

A

B

C

D

3900 3900 3900 39003000 3900

1800

3900

6000

26400

9600

1800

CAU THANG

DDA-200x350 DDA-200x350 DDA-200x350 DDA-200x350 DDA-200x350 DDA-200x350

DDB-200x350 DDB-200x350 DDB-200x350 DDB-200x350 DDB-200x350 DDB-200x350

DD-200x350 DD-200x350 DD-200x350 DD-200x350 DD-200x350 DD-200x350

DDC-200x350 DDC-200x350 DDC-200x350 DDC-200x350 DDC-200x350 DDC-200x350

DDD-200x350 DDD-200x350 DDD-200x350 DDD-200x350 DDD-200x350 DDD-200x350

DN1-2

00x350

DN1-2

00x450

DN1-2

00x450

DN1-2

00x350

DN2-2

00x350

DN2-2

00x450

DN2-2

00x450

DN2-2

00x300

DN3-2

00x350

DN3-2

00x450

DN3-2

00x450

DN3-2

00x300

DN4-2

00x350

DN4-2

00x450

DN4-2

00x450

DN4-2

00x300

DN5-2

00x350

DN5-2

00x450

DN5-2

00x450

DN5-2

00x300

DN6-2

00x350

DN6-2

00x450

DN6-2

00x450

DN6-2

00x300

DN7-2

00x350

DN7-2

00x450

DN7-2

00x450

DN7-2

00x300

DN8-2

00x350

DN8-2

00x450

DN8-2

00x450

DN8-2

00x400

C200x450

C200x350

C200x350

C200x450

S O KET CAU DAM SAN - SAN TANG IEN HNH

C200x450 C200x450 C200x450 C200x450 C200x450 C200x450 C200x450

C200x350 C200x350 C200x350 C200x350 C200x350 C200x350 C200x350

C200x350 C200x350 C200x350 C200x350 C200x350 C200x350 C200x350

C200x450 C200x450 C200x450 C200x450 C200x450 C200x450 C200x450


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III. S KT CU KHUNG PHNG

1. S hnh hc (s kt cu thc)

+0.000

-0.500

500

500

390

03

300

3300

330

0

+3.900

+7.200

+10.500

+13.800

A B C D

1800 6000 1800

C200x350

C200x350

C200x250

C200x250 C200x350

C200x350

C200x450

C200x450 C200x350

C200x350

C200x250

C200x250C200x350

C200x350

C200x450

C200x450

D200x350

D200x350

D200x350

D200x350D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x300

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x350

D200x450

D200x450

D200x450

D200x350

D200x350

100

S O HNH HOC KHUNG TRUC 3

D200x350

D200x350

100

1725


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2. S kt cu

M hnh ha kt cu khung thnh cc thanh ng (ct) v cc thanh ngang (dm)

vi trc ca h kt cu c tnh n trng tm ca tit din cc thanh.

2.1. Nhp tnh ton ca dm

Nhp tnh ton ca d ly bng khong cch gia cc trc ct.

Xc nh nhp tnh ton ca dm AB: 250 350

1800 100 1750( )2 2AB

l mm

(do ct c tit din khng i nn trc ct l trc c nh)

Nhp tnh ton ca dm BC: 350 350

6000 100 100 5850( )2 2BC

l mm

( y ly trc ct l trc ct tng 3,4)

Nhp tnh ton ca dm CD: 250 350

1800 100 1750( )2 2CD

l mm

Tnh ton sai lch gia nhp tnh ton v khong cch trc ca cng trnh: 1800 1750

2, 78% 5%1800AB

l

C th chn nhp tnh ton AB l 1800( )

1750( )AB

AB

l mm

l mm

.

Ta chn nhp tnh ton AB l 1800( )ABl mm .

6000 58502,5% 5%

6000BCl

.C th chn nhp tnh ton 5850

6000BC

BC

l mm

l mm

.

Ta chn nhp tnh ton dm BC 6000( )BCl mm . 1800 1750

2, 78% 5%1800CD

l


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23


Chn nhp tnh ton ca dm CD l 1800( )CDl mm .

Xc nh chiu cao ca ct Chiu cao ca ct ly bng khong cch gia cc trc dm. Do dm khung c tit

din thay i nn ta s xc nh chiu cao ct theo trc dm hnh lang do c tit din dm

nh hn (thin v an ton).

Chiu cao ca ct tng 1:

Khong cch ct 0,000m n mt trn ca bn mng 500 0, 5 mh mm .

1 1

3503900 500 500 4725( )

2 2d

t

hh h h h mm

Vy chiu cao tnh ton ca ct tng 1 1

4725th mm

Chiu cao ct tng 2,3,4:

2 3 43300t t t th h h h mm

Vy chiu cao tnh ton ca ct tng 2,3,4 2,3,4

3300th mm .


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2.2. S kt cu khung

A B C D

1800 6000 1800

C200x350

C200x350

C200x250

C200x250 C200x350

C200x350

C200x450

C200x450 C200x350

C200x350

C200x250

C200x250C200x350

C200x350

C200x450

C200x450

D200x350

D200x350

D200x350

D200x350

D200x450

D200x450

D200x450

D200x350

D200x350

D200x350200

033

0033

0033

0047

25

S O KET CAU KHUNG TRUC 3

D200x350 D200x350


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IV. XC NH TI TRNG N V

1. Xc nh ti trng phn b trn sn, mi

1.1 Sn tng in hnh.

Vi sn trong phng:

Gi tr hot ti tiu chun c quy nh trong mc 4.3.1. Tiu chun TCVN

2737-1995: Ti trng v tc ng.

Ly 2. 200 1,2 240( / )csp p n daN m

Tnh ti tnh ton:

1. Lp gch ceramic v va m XM#50.

2. Lp BTCT sn.

3. Va XM#50 trt trn.

Hnh: Cu to cc lp sn, sn tng in hnh

Bng 1: Bng gi tr tnh ti tnh ton ca sn tng in hnh

Lp cu to Chiu dy

( )cmd Trng lng

ring

3(da / )i N m

Gi tr tiu

chun ca

tnh ti

2( / m )daN

H s tin

cy

n

Gi tr tnh

ton ca

tnh ti

2( / m )daN

Gch lt 1,5 2000 30,0 1,1 33

Va lt 1,5 1800 27,0 1,3 35,1

Lp BTCT 9 2500 225,0 1,1 247,5

Va trt 1,5 1800 27,00 1,3 35,1

TNG CNG 309 -- 350,7

3090

10

1

3

2


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26


Bng 2: Bng gi tr tnh ti tnh ton ca tng 100

Lp cu to Chiu

dy

( )cmd

Trng

lng ring

3(da / )i N m

Gi tr tiu

chun ca

tnh ti

2( / m )daN

H s tin

cy

n

Gi tr tnh

ton ca

tnh ti

2( / m )daN

Gch 100mm 10,0 1500 150 1,1 165

Va trt 2 lp

dy trung bnh

30mm

3,0 2000 60 1,3 78

TNG CNG 210 -- 243

Bng 4: Bng gi tr tnh ti tnh ton ca tng 200

Lp cu to Chiu

dy

( )cmd

Trng

lng ring

3(da / )i N m

Gi tr tiu

chun ca

tnh ti

2( / m )daN

H s tin

cy

n

Gi tr tnh

ton ca

tnh ti

2( / m )daN

Gch 200 mm 20,0 1500 300 1,1 330

Va trt 2 lp

30mm

3,0 2000 60 1,3 78,0

TNG CNG 360 -- 408

1.2 Vi sn trong phng

Tng tnh ti cu to lp sn: 2350,7 /og daN m .

Tng ti trng phn b tnh ton trn sn: 2240 350,7 590,7( / )o s oq p g daN m


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27


1.3. Vi sn hnh lang

Hot ti tnh ton: 2300 1,2 360( / )chlp p n daN m .

Tng ti trng phn b tnh ton trn sn: 2360 350,7 710,7( / )o hl oq p g daN m

1.4. Vi sn v sinh, nh bp

Xem nh chiu dy sn v sinh khng thay i so vi sn trong phng. Tng tnh

ti cc lp cu to sn 2350,7 /og daN m .

sn c tng xy trc tip ln sn, xem tng hon ton c, khng xt n l

ca (thin v an ton). Tnh ti tnh ton ca tng xy trn sn quy v phn b u trn

sn:

211

1,5.(3,3 0,09).0,1.1500.1,1.1,2 136( / )

1,8.3,9i i i

t t

L hg n k daN m

L B

Vi: tn : h s vt ti ca tng xy trn sn

:tk H s xt n v tr ca tng trn dm. 1, 2k i vi tng xy khu

vc gia sn.

Tng ti trng phn b tnh ton trn sn:

21 240 350,7 136 726,7( / )o s oq p g g daN m


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28


1.5. Sn mi

Bng: Bng gi tr tnh ti tnh ton ca sn mi

Lp cu to Chiu

dy

( )cmd

Trng

lng

ring

(da / )i N m

Gi tr tiu

chun ca

tnh ti

2( / m )daN

H s tin

cy

n

Gi tr tnh

ton ca

tnh ti

2( / m )daN

Gch gi ngi 60 1,3 78

Va m XM #75 1,5 2000 30 1,3 39

Lp BTCT 8 2500 200,0 1,1 220,0

Trn thch cao 50 1,3 65

TNG CNG 340 -- 402

Hot ti ch xt hot ti sa cha, theo TCVN 2737-1995 Ti trng v tc ng-

Tiu chun thit k, ly hot ti tiu chun 275( / )tcmp daN m . i vi hot ti c gi tr

b hn 200 ta ly h s an ton 1, 3n .

Hot ti tnh ton: 21,3 75 97,5( / )ttmp daN m .

Tng ti trng phn b tnh ton trn sn mi:

297,5 402 499,5( / )tto m oq p g daN m

2. Tnh ti n v

Tnh ti sn tng in hnh: 2350,7( / )sg daN m

Tnh ti sn mi: 2402( / )mg daN m

Tnh ti tng xy 200: 2200 408( / )g daN m


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29


Tnh ti tng xy 100: 2100 243( / )g daN m

3. Hot ti n v

Hot ti phng ng,WC: 2240( / )np daN m . Hot ti sn hnh lang 2360( / )hlp daN m .

Hot ti sn mi (ch xt n hot ti sa cha) 297,5( / )mp daN m .

4. H s quy i ti trng

Ti trng phn b tc dng ln khung c dng tam gic, quy i sang dng ti

phn b u hnh ch nht, ta c k s 5 0, 6258

k .

V. XC NH TI TRNG TNH TC DNG VO KHUNG

1. Tnh ti tng in hnh: 2,3,4

1.1. Ti trng phn b

1.1.1. Ti trng tnh truyn t bn sn ln dm khung

Tung ln nht ca ti trng (hnh thang hay tam gic) do mt sn truyn ln

dm: 1 2

ns

Lg g . Ta c s truyn ti ca sn nh sau:


MSSV:12520801026-LP: XD12A1


30

1 2 3 4 5 6 7 8

A

B

C

D

3900 3900 3900 39003000 3900

1800

3900

6000

26400

9600

1800

CAU THANG

S O TRUYEN TAI CUA SAN VAO DAM KHUNG


MSSV:12520801026-LP: XD12A1


31 31

1.1.2. Trng lng bn thn dm khung

Trng lng bn thn ct, dm khung c tnh trc tip bng phn mm trn

my tnh: SAP2000 version 16.

1.1.3. Ti trng tng ngn xy trn dm khung

Quan nim thit k: coi tng ngn khng chu lc, ch l tng bao che, trng

lng tng truyn ln dm l phn b u. Quan nim ny lm n gin vic tnh ton

nhng khng kinh t.

Tr s ti phn b u do trng lng tng 3k t t c

g g H k .

Trong :

tg : ti trng trn 21m tng tnh trong phn xc nh ti trng n v.

tH : chiu cao tng, tnh bng m, bng chiu cao tng tr i chiu cao dm trn

nh tng.

:ck h s gim ti trng do l ca, bng din tch ca chia cho din tch tng trong

phm vi nhp dm.

i vi tng xy trn dm ph c xc nh tng t cng thc trn, tuy nhin

ti trng t dm ph truyn ln dm chnh thng qua lc tp trung.

i vi nh bp, WC, tng xy trc tip ln sn, quy i ti trng tng thnh ti

trng phn b u ln sn tnh ton phn ti trng n v. Phn ti trng ca tng

xy trn sn cng trc tip vi sg nh l phn ph thm ti trng tnh tuyn ln dm

khung, dng tnh ti trng phn b.

1.2. Ti trng tp trung

1.2.1. Ti trng tp trung do sn truyn vo dm


MSSV:12520801026-LP: XD12A1


32 32

( ) / 2sti sti spi spiG g S g S Trong :

, :st spg g ln lt l ti trng n v trn tng sn pha tri v pha phi ca

dm khung.

,t pS S : ln lt l din tch truyn ti ln dm dc ca tng sn pha tri v pha

phi ca dm khung.

1.2.2. Trng lng tng xy trn dm dc

/ 2t t cG g H k L

Trong , ,t t cg H k : ln lt l tnh ti phn b ca sn, chiu cao tng, h s

gim l ca ca tng.

Khi c hai pha ca dm khung u c dm dc tc dng ln cng 1 v tr 2 gi tr

lc tp trung 1 2,G G th G l tng ca lc tp trung bn phi v tri.

2 3 4

3900 3900

180

060

0018

00

A

B

C

D

GB

A

B

C

D

GA

G1

GC

GD

3

S O PHAN TNH TAI TANG 2,3,4


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33 33

TNH TI PHN B - daN/m

STT Loi ti trng v cch tnh Kt qu

(daN/m)

1

Do trng lng tng xy trn dm:

Sn phng ng: 1 243 (3,3 0,45) 692,6( / )tg daN m

Sn bp, WC: 2 243 (3,3 0,35) 716,9( / )tg daN m

692,6

716,9

2

Do ti trng t sn truyn vo dm khung di dng ti hnh tam

gic vi tung ln nht:

Vi sn trong phng: 350,7 (3,0 0,2) 982,0( / )tgg daN m

Vi sn hnh lang, WC: 350,7 (1,8 0,3) 526,1( / )hlg daN m

982,0

526,1

TNH TI TP TRUNG - daN


(daN)

1

GA

Ti trng do tng xy trn dm: Tng 200.

408 (3, 3 0, 35) (3, 9 0, 2) 1 4453, 3( )daN

Do ti trng truyn t sn vo:

(350,7 136) 3,7 (3,7 1,5) 1,5/ 4 1076,8( )daN Trng lng bn thn dm dc 0,2x0,35(m):

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

4453,3

1076,8

750,8

TNG CNG 6280,9

2

GB

Ti trng do tng xy trn dm: Tng 100. H s gim l ca 0,7

243 (3, 3 0, 35) (3, 9 0, 2) 0, 7 1856, 6( )daN


1856,6


MSSV:12520801026-LP: XD12A1


34 34

(350,7 136) 3,7 (3,7 1,5) 1,5/ 4 1076,8( )daN 350,7 3,7 3,7 2,8 2,8 / 4 1129,3( )daN

Trng lng bn thn dm dc 0,2x0,35(m)

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

1076,8

1129,3

750,8

TNG CNG 4813,5

3

G1


350,7 3,7 (3,7 2,8) 2,8/ 2 2258,5( )daN

2258,5

4

GC

Ti trng do tng xy trn dm: Tng 200. H s gim l ca 0,7

408 (3, 3 0, 35) (3, 9 0, 2) 0, 7 3117, 3( )daN


350,7 3,7 (3,7 1,5) 1,5/ 4 775,9( )daN 350,7 3,7 3,7 2,8 2,8 / 4 1129,3( )daN


2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

3117,3

775,9

1129,3

740,8

TNG CNG 5773,3

5

GD

Ti trng do tng xy trn dm: Tng lan can 100 cao 1,0m

243 1, 0 (3, 9 0, 2) 1 899,1( )daN


350,7 3,7 (3,7 1,5) 1,5/ 4 775,9( )daN Trng lng bn thn dm dc 0,2x0,35 (m)

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

899,1

775,9

750,8

TNG CNG 2415,8


MSSV:12520801026-LP: XD12A1


35 35

2. Tnh ti tng mi

2.1. Phn mi bng AB

TNH TI - daN


(daN)

1

GB

Ti trng do tng xy trn dm: Tng 200 cao 2m

408 2 (3, 9 0, 2) 1 3019, 2( )daN


402 3,7 (3,7 1,5) 1,5/ 4 889,4( )daN Trng lng bn thn dm dc 0,2x0,35 (m)

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

3019,2

889,4

750,8

TNG CNG 4659,4

2

GA

Do ti trng truyn t sn vo :

402 3,7 (3,7 1,5) 1,5/ 4 889,4( )daN Trng lng bn thn dm dc 0,2x0,35 (m)

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

889,4

750,8

TNG CNG 1640,2

1800

A

BGB

A

B

GA

3900 3900

2 3 4

S O PHAN TNH TAI PHAN MAI BANG

3


MSSV:12520801026-LP: XD12A1


36 36

3

Lc phn b t sn truyn vo di dng tam gic vi tung ln

nht:

402 (1,8 0,3) 603( )mg daN 603

2.2. Phn mi dc BCD



(daN/m)

1

Do ti trng t sn mi truyn vo dm khung di dng ti hnh tam

gic vi tung ln nht:

402 (3,1 0, 2) 1165.8( / )daN m

402 (1,86 0, 3) 627,1( / )daN m

402 (1, 03 0, 2) 333, 7( / )daN m

1165,8

627,1

333,7

6200

1860

3900 3900

1030

S O CHAT TNH TAI TANG MAI


MSSV:12520801026-LP: XD12A1


37 37



(daN)

1

GB


402 3,9 0, 2 3,9 3,1 3,1 0, 2 / 4 1311,5( )daN Trng lng bn thn dm dc 0,2x0,35 (m)

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

1311,5

750,8

TNG CNG 2062,3

2

G1

Do ti trng truyn t sn mi vo:

402 3,9 0, 2 3,9 3,1 3,1 0, 2 / 2 2623,1( )daN

2623,1

3

GC


402 3,9 0, 2 3,9 3,1 3,1 0, 2 / 4 1311,5( )daN 402 (3, 7 (3, 7 1, 56)) 1, 56 / 4 915, 6( )daN

Trng lng bn thn dm dc 0,2x0,35 (m)

2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

1311,5

915,6

750,8

TNG CNG 2977,9

4

GD

Do ti trng t sn mi truyn vo

402 (3, 7 (3, 7 1, 56)) 1, 56 / 4 915, 6( )daN

402 (3, 7 (3, 7 (1, 03 0, 2)) (1, 03 0, 2) / 4 611, 3( )daN


2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

915,6

611,3

750,8


MSSV:12520801026-LP: XD12A1


38 38

TNG CNG 2277,7

5

G2

Do ti trng truyn t sn mi vo:

402 (3, 7 (3, 7 (1, 03 0, 2)) (1, 03 0, 2) / 4 611, 3( )daN


2500 1,1 0, 2 0, 35 3, 9 750,8( )daN

611,3

750,8

TNG CNG 1362,1


MSSV:12520801026-LP: XD12A1


39 39

3. S tnh ti tc dng ln khung

S O TNH TAI TAC DUNG LEN KHUNG


MSSV:12520801026-LP: XD12A1


40 40

VI. XC NH HOT TI TC DNG LN KHUNG

1. Hot ti cht y

1.1. Tng in hnh (tng 2,3,4)



(daN/m)

1

Do ti trng t sn truyn vo dm khung di dng ti hnh tam

gic vi tung ln nht:

Vi sn trong phng: 240 3,0 720( / )tgp daN m

Vi sn hnh lang: 360 (1,8 0,1) 612( / )hlp daN m

Vi sn WC: W 240 (1,8 0,1) 408( / )Cp daN m

720

612

408



2 3 4

3900 3900

1800

6000

1800

A

B

C

D

PB

A

B

C

D

PA

P1

PC

PD

3

S O PHAN HOAT TAI CHAT AY TANG 2,3,4


MSSV:12520801026-LP: XD12A1


41 41

(daN)

1

PA

Do ti trng t sn truyn vo:

240 (3, 9 (3, 9 1, 7)) 1, 7 / 4 622, 2( )daN

622,2

2

PB


240 (3, 9 (3, 9 1, 7)) 1, 7 / 4 622, 2( )daN

240 3,9 (3,9 3,0) 3,0 / 4 864( )daN

622,2

864

TNG CNG 1486,2

3

P1


240 3,9 (3,9 3,0) 3,0 / 4 864( )daN 240 3,9 (3,9 3,0) 3,0 / 4 864( )daN

864

864

TNG CNG 1728

3

PC


240 3,9 (3,9 3,0) 3,0 / 4 864( )daN 360 (3, 9 (3, 9 1, 7)) 1, 7 / 4 933, 3( )daN

864

933,3

TNG CNG 1797,3

4

PD


360 (3, 9 (3, 9 1, 7)) 1, 7 / 4 933, 3( )daN

933,3

TNG CNG 933,3


MSSV:12520801026-LP: XD12A1


42 42

1.2. Hot ti cht y tng mi

1.2.1. Phn mi bng

HOT TI CHT Y TNG MI


(daN)

1

PA


97, 5 (3, 9 (3, 9 1, 7)) 1, 7 / 4 252,8( )daN

252,8

2

PB


97, 5 (3, 9 (3, 9 1, 7)) 1, 7 / 4 252,8( )daN

252,8

3 Do ti t sn truyn vo di dng tam gic

97, 5 1, 70 165, 8( )daN 165,8

1800

A

BPB

A

B

PA

3900 3900

2 3 4

S O PHAN HOAT TAI CHAT AY PHAN MAI BANG

3


MSSV:12520801026-LP: XD12A1


43 43

1.2.2. Mi dc

HOT TI 1 TNG MI


(daN)

1

PB


97,5 3,9 (3,9 3,1) 3,1/ 4 355,1( )BP daN

355,1

2

P1


1 97,5 3,9 (3,9 3,1) 3,1/ 2 710,3( )P daN

710,3

3 1p

Do sn truyn vo di dng ti tam gic c tung ln nht: 302.3

6200

3900 3900

1030

S O PHAN HOAT TAI CHAT AY TANG MAI

1860


MSSV:12520801026-LP: XD12A1


44 44

1 97,5 3,1 302,3( / )p daN m

4

PC

Do ti trng t sn truyn vo di dng ti tp trung:

97,5 3,9 (3,9 3,1) 3,1/ 4 355,1( )daN 97.5 (3, 9 (3, 9 1, 76)) 1, 76 / 4 259,1( )daN

355,1

259,1

TNG CNG 614,2

5

p2

Do ti trng t sn truyn vo di dng ti tam gic:

97, 5 1, 03 100, 4( )daN

100.4

6

p3


97, 5 1, 76 171, 6( )daN

171,6

7

PD


97, 5 (3, 9 (3, 9 1, 03)) 1, 03 / 4 170( )daN

97.5 (3, 9 (3, 9 1, 76)) 1, 76 / 4 259,1( )daN

170

259,1

TNG CNG 429,1

8

P2


97, 5 (3, 9 (3, 9 1, 03)) 1, 03 / 4 170( )daN

170


MSSV:12520801026-LP: XD12A1


45 45

2. Trng hp hot ti 1

1.1. Tng 2,4

HOT TI 1 TNG 2,4


(daN)

1

PA


240 (3, 9 (3, 9 1, 7)) 1, 7 / 4 622, 2( )daN

622,2

2 Do sn truyn vo di dng tam gic: 408

2 3 4

3900 3900

1800

6000

1800

A

B

C

D

PB

A

B

C

D

PA

3

S O PHAN HOAT TAI TANG 2,4

PD

PC


MSSV:12520801026-LP: XD12A1


46 46

240 1, 7 408( )daN

3

PB


240 (3, 9 (3, 9 1, 7)) 1, 7 / 4 622, 2( )daN

622,2

4

PC


360 (3, 9 (3, 9 1, 7)) 1, 7 / 4 933, 3( )daN

933.3

5 Do sn truyn vo di dng tam gic:

360 1, 7 612( )daN 612

6

PD


360 (3, 9 (3, 9 1, 7)) 1, 7 / 4 933.3( )daN

933.3


MSSV:12520801026-LP: XD12A1


47 47

1.2. Tng 3

HOT TI 1 TNG 3


(daN)

1

PC


240 3,9 (3,9 3,0) 3,0 / 4 864( )CP daN

864

3

1p

Do sn truyn vo di dng ti tam gic c tung ln nht:

1 240 3,0 720( / )p daN m 720

4 1P

Do sn truyn vo di dng ti tp trung: 1728

2 3 4

3900 3900

1800

6000

1800

A

B

C

D

PB

A

B

C

D

PC

3

S O PHAN HOAT TAI 1 TANG 3

P1


MSSV:12520801026-LP: XD12A1


48 48

1 240 3,9 (3,9 3,0) 3,0/ 2 1728( )P daN

5

PB

Do sn truyn vo di dng ti tp trung:

240 3,9 (3,9 3,0) 3,0 / 4 864( )BP daN 864

1.3. Tng mi

HOT TI 1 TNG MI


(daN)

1

PB


97,5 3,9 (3,9 3,1) 3,1/ 4 355,1( )BP daN

355,1

6200

3900 3900

1030

S O PHAN HOAT TAI 1 TANG MAI

1860


MSSV:12520801026-LP: XD12A1


49 49

2

P1


1 97,5 3,9 (3,9 3,1) 3,1/ 2 710,3( )P daN

710,3

3

1p

Do sn truyn vo di dng ti tam gic c tung ln nht:

1 97,5 3,1 302,3( / )p daN m 302.3

4

PC


97,5 3,9 (3,9 3,1) 3,1/ 4 355,1( )CP daN 355,1

5

p2

Do ti trng t sn truyn vo di dng ti tam gic:

97, 5 1, 03 100, 4( )daN

100.4

6

PD


97 , 5 (3, 9 (3, 9 1, 03)) 1, 03 / 4 25, 9 ( )DP daN

25.9

7

P2


97, 5 (3, 9 (3, 9 1, 03)) 1, 03 / 4 25, 9( )daN

25.9


MSSV:12520801026-LP: XD12A1


50 50

2. Trng hp hot ti 2

2.1. Tng 2,4

HOT TI 2 TNG 2,4


(daN)

1

PC


240 3,9 (3,9 3,0) 3,0 / 4 864( )CP daN

864

3 1p

Do sn truyn vo di dng ti tam gic c tung ln nht: 720

2 3 4

3900 3900

1800

6000

1800

A

B

C

D

PB

A

B

C

D

PC

3

S O PHAN HOAT TAI 2 TANG 2,4

P1


MSSV:12520801026-LP: XD12A1


51 51

1 240 3,0 720( / )p daN m

4

1P


1 240 3,9 (3,9 3,0) 3,0/ 2 1728( )P daN 1728

5

PB


240 3,9 (3,9 3,0) 3,0/ 4 864( )DP daN 864

2.2. Tng 3

2 3 4

3900 3900

1800

6000

1800

A

B

C

D

PB

A

B

C

D

PA

3

S O PHAN HOAT TAI 2 TANG 3

PD

PC


MSSV:12520801026-LP: XD12A1


52 52

HOT TI 2 TNG 3


(daN)

1

PA


240 (3, 9 (3, 9 1, 7)) 1, 7 / 4 622, 2( )daN

622,2


240 1, 7 408( )daN 408

3

PB


240 (3, 9 (3, 9 1, 7)) 1, 7 / 4 622, 2( )daN

622,2

4

PC


360 (3, 9 (3, 9 1, 7)) 1, 7 / 4 933, 3( )daN

933.3


360 1, 7 612( )daN 612

6

PD


360 (3, 9 (3, 9 1, 7)) 1, 7 / 4 933.3( )daN

933.3


MSSV:12520801026-LP: XD12A1


53 53

2.3. Tng mi

2.3.1. Mi bng

HOT TI 2 TNG MI


(daN)

1

PA


97, 5 (3, 9 (3, 9 1, 7)) 1, 7 / 4 252,8( )daN

252,8

2

PB


97, 5 (3, 9 (3, 9 1, 7)) 1, 7 / 4 252,8( )daN

252,8

3 Do ti t sn truyn vo di dng tam gic

97, 5 1, 70 165, 8( )daN 165,8

1800

A

BPB

A

B

PA

3900 3900

2 3 4

S O PHAN HOAT TAI 2 PHAN MAI BANG

3


MSSV:12520801026-LP: XD12A1


54 54

2.3.2. Phn mi dc

HOT TI 2 TNG MI


(daN)

1

PC


97.5 (3, 9 (3, 9 1, 76)) 1, 76 / 4 259,1( )daN

259,1


97, 5 1, 76 171, 6( )daN 171,6

3

PD


97.5 (3, 9 (3, 9 1, 76)) 1, 76 / 4 259,1( )daN

259,1

6200

3900 3900

1030

S O PHAN HOAT TAI 2 TANG MAI

1860

PD

PC


MSSV:12520801026-LP: XD12A1


55 55

HOAT TAI CHAT AY

3. S hot ti tc dng vo khung


MSSV:12520801026-LP: XD12A1


56 56

S O CHAT HOAT TAI 1


MSSV:12520801026-LP: XD12A1


57 57

S O CHAT HOAT TAI 2


MSSV:12520801026-LP: XD12A1


58 58

VII. XC NH TI TRNG GI TC DNG LN KHUNG

1. Phn b gi dc theo chiu cao khung.

Cng trnh xy H Ni, theo tiu chun TCVN 2737-1995: Ti trng v tc ng Tiu chun thit k, H Ni thuc vng gi II.B, c p lc gi n v:

2W 95( / )o daN m . Cng trnh c xy dng dng a hnh trng tri nn thuc dng a hnh A.

Ct cao t mt t t nhin ca nh mi l 15.800 40m m nn ta ch xt n ti trng tnh ca gi. Ti trng gi truyn ln khung tnh theo cng thc:

Gi y: Wd o i dq nkc B

Gi ht: Wh o i hq nkc B .

Vi:

Wo :Gi tr p lc gi ly theo bn phn vng.

n : H s tin cy ca ti trng gi, ly 1, 2n ng vi cng trnh c thi gian s dng gi nh l 50 nm.

:ik H s tnh n s thay i p lc gi theo cao.

:B b rng on gi

Bng: Bng tnh h s p lc gi theo cao k

Tng H tng (m) z (m) k

1 4,725 4,725 1,06

2 3,3 8,05 1,14

3 3,3 11,35 1,20

4 3,3 14,65 1,24


MSSV:12520801026-LP: XD12A1


59 59

Bng: Bng tnh ton ti trng gi.

STT H (m) z (m) k n B (m) dc hc ( / )dq

daN m

( / )hq

daN m

1 4,725 4,725 1,06 1,2 3,9 0,8 0,6 377,0 282,8

2 3,3 8,025 1,14 1,2 3,9 0,8 0,6 405,5 304,1

3 3,3 11,325 1,20 1,2 3,9 0,8 0,6 426,8 320,1

4 3,3 14,625 1,24 1,2 3,9 0,8 0,6 441,0 330,8

5 2,0 16,625 1,26 1,2 3,9 0,8 0,6 448,2 336,1

Vi:

:dq p lc gi y tc dng ln khung ( / )daN m .

:hq p lc gi ht tc dng l nkhung ( / )daN m .

2. Phn ti trng gi tc dng ln mi

Ti trng gi truyn ln khung mt on mi th i c xc nh theo cng thc:

W ( ) / 2 Wo i tr ph o iq nkc L L nkc B

Hng ca ti trng gi tc dng ln mi l phng vung gc vi mt mi.

Chiu cao cng trnh: 16.80H m .

Chiu rng cng trnh: 26, 4 mL .

T s 12

0, 460, 6

0, 4e

e

cH

cL

. Ti trng gi c truyn vo dm xin ca mi.


MSSV:12520801026-LP: XD12A1


60 60

z (m) k n B (m) dc hc ( / )dq

daN m

( / )hq

daN m

16.80 1,26 1,2 3,9 -0,46 -0,4 -257,7 -224,1

Ti trng do gi tc dng ln mi trong 2 trng hp u l gi gy bc mi.

3. S gi tc dng ln khung

S O GIOX TAC DUNG LEN KHUNG


MSSV:12520801026-LP: XD12A1


61 61

S O GIOXX TAC DUNG LEN KHUNG


MSSV:12520801026-LP: XD12A1


62 62

VIII. T HP TI TRNG

1. nh ngha cc trng hp ti trng

STT K HIU LOI GHI CH

1 TT DEAD Tnh ti

2 HTCD LIVE Hot ti cht y

3 HT1 LIVE Hot ti 1

4 HT2 LIVE Hot ti 2

5 GIOX WIND Gi theo phng X, thi t tri qua phi 6 GIOXX WIND Gi theo phng X, thi t phi qua tri

2. Cc t hp c bn

2.1. T hp c bn 1

Cu trc: (1.0 x Tnh ti + 1.0 x Hot ti)

TT TN T HP CU TRC T HP

1 COMB1 1.0 x Tnh ti +1.0 x Hot ti cht y

2 COMB2 1.0 x Tnh ti +1.0 x Hot ti 1

3 COMB3 1.0 x Tnh ti +1.0 x Hot ti 2

4 COMB4 1.0 x Tnh ti +1.0 x GIOX

5 COMB5 1.0 x Tnh ti +1.0 x GIOXX

2.2. T hp c bn 2

Cu trc: (1.0 x Tnh ti + 0.9 x Tng hot ti tm thi lm tng ni lc cu kin)

TT TN T HP CU TRC T HP

6 COMB6 Tnh ti + 0.9 x (HTCD + GiX)

7 COMB7 Tnh ti + 0.9 x (Hot ti 1 + GiX)

8 COMB8 Tnh ti + 0.9 x (Hot ti 2+ GiX)

9 COMB9 Tnh ti + 0.9 x (HTCD+ GiXX)

10 COMB10 Tnh ti + 0.9 x (Hot ti 1 + GiXX)


MSSV:12520801026-LP: XD12A1


63 63

BIEU O BAO MOMEN KHUNG TRUC 3

11 COMB11 Tnh ti + 0.9 x (Hot ti 2 + GiXX)

12 BAO Evelope(COMB1,COMB2,COMB9)

2.3. T hp c bit

Trong phm vi n khng xt n t hp ti trng c bit.

3. Biu bao momen khung trc 3


MSSV:12520801026-LP: XD12A1


64 64

BIEU O BAO LC CAT KHUNG TRUC 3

4. Biu bao lc ct khung trc 3


MSSV:12520801026-LP: XD12A1


65 65

BIEU O BAO LC DOC KHUNG TRUC 3

5. Biu lc dc trong ct


MSSV:12520801026-LP: XD12A1


66 66

6. nh s cc cu kin trong khung


67 67

7. Bng kt qu ni lc trong khung

7.1. Ni lc trong dm D200x450, phn t s 14

TABLE: Element Forces - Frames

Frame Station OutputCase CaseType StepType P V2 V3 T M2 M3 FrameElem ElemStation Text m Text Text Text KN KN KN KN-m KN-m KN-m Text m 14 0 BAO Combination Max 21.05 -35.131 0 0 0 2.5365 14-1 0 14 0.75 BAO Combination Max 21.05 -26.239 0 0 0 25.7806 14-1 0.75 14 1.5 BAO Combination Max 21.05 -13.665 0 0 0 42.4861 14-1 1.5 14 2.25 BAO Combination Max 21.05 -1.09 0 0 0 57.2391 14-1 2.25 14 3 BAO Combination Max 21.05 7.802 0 0 0 64.0352 14-1 3 14 3 BAO Combination Max 21.05 36.174 0 0 0 64.0352 14-1 3 14 3.75 BAO Combination Max 21.05 46.281 0 0 0 55.7862 14-1 3.75 14 4.5 BAO Combination Max 21.05 62.5 0 0 0 39.9214 14-1 4.5 14 5.25 BAO Combination Max 21.05 78.72 0 0 0 21.2976 14-1 5.25 14 6 BAO Combination Max 21.05 88.827 0 0 0 -3.3146 14-1 6 14 0 BAO Combination Min 12.157 -87.351 0 0 0 -121.807 14-1 0 14 0.75 BAO Combination Min 12.157 -77.244 0 0 0 -59.7018 14-1 0.75 14 1.5 BAO Combination Min 12.157 -61.025 0 0 0 -13.9506 14-1 1.5 14 2.25 BAO Combination Min 12.157 -44.805 0 0 0 18.6256 14-1 2.25 14 3 BAO Combination Min 12.157 -34.698 0 0 0 42.6685 14-1 3 14 3 BAO Combination Min 12.157 -5.978 0 0 0 42.6685 14-1 3 14 3.75 BAO Combination Min 12.157 2.914 0 0 0 17.6367 14-1 3.75 14 4.5 BAO Combination Min 12.157 15.489 0 0 0 -16.3075 14-1 4.5 14 5.25 BAO Combination Min 12.157 28.063 0 0 0 -62.6647 14-1 5.25 14 6 BAO Combination Min 12.157 36.955 0 0 0 -125.8714 14-1 6


68 68

7.2. Ni lc ct C200x450, phn t s 9

TABLE: Element Forces - Frames

Frame Station OutputCase CaseType P V2 V3 T M2 M3 FrameElem ElemStation Text m Text Text KN KN KN KN-m KN-m KN-m Text m

1 0 COMB1 Combination -284.674 -0.339 0 0 0 -0.702 1-1 0

1 4.725 COMB1 Combination -276.877 -0.339 0 0 0 0.8999 1-1 4.725





1 0 COMB4 Combination -134.911 22.072 0 0 0 40.4847 1-1 0

1 4.725 COMB4 Combination -127.115 4.258 0 0 0 -21.7199 1-1 4.725
















MSSV:12520801026-LP: XD12A1


69 69

IX. TNH TON CT THP CHO DM KHUNG

1. Tnh ton v chn ct dc cho dm

S dng b tng cp bn B20 c: 11,5 , 0,9b btR MPa R MPa .

S dng thp dc nhm AII c: 280s scR R MPa .

Tra bng ph lc ta c: 0,623; 0,429R R .

1.1. Tnh ton ct thp dc cho dm tng 2, nhp BC, phn t 14 (bxh=200x450 mm)

T bng kt qu ni lc, ta chn c ni lc nguy him nht cho dm:

Gi B: 121,81( )BM kNm Gi C: 125,87( )CM kNm Nhp BC: 64,04( )BCM kNm

Do 2 gi c momen gn bng nhau nn ta ly gi tr momen ln hn tnh ct thp

chung cho c 2.

1.1.1. Tnh ct thp cho gi B v C (momen m)

Tnh theo tit din ch nht 200 450( )b h mm .

Gi thit 4a cm . 45 4 41( )oh h a cm . Ti gi B v C c 125,87( )M kNm .

3

2 2

125,87 100,326, 0, 429

11.5 20 41m m Rb o

M

R bh

B C

D14M=-121,84kNm M=-125,87kNmM=+64,04kNm


MSSV:12520801026-LP: XD12A1


70 70

0,5(1 1 2 ) 0,5(1 1 2 0,326) 0,795m . 3

2125,87 10 13,59( )280 0,795 41s s o

MA cm

R h

.

Kim tra hm lng ct thp:

13,59100% 100% 1,68%

20 41s

o

A

bh

min

min maxmax

0, 05%

1150, 623 2,56%

2800b

s

R

R

Vy hm lng ct thp tha yu cu cu to.

1.1.2. Tnh ct thp cho nhp BC (momen dng)

Tnh theo tit din ch T c cnh nm trong vng nn vi ' 9fh cm .

Gi thit 4 45 4 41oa cm h h a cm .

vn ca cnh cS . Ta c

cS b hn mt na khong cch thng thy gia cc sn dc: 0, 5 (3, 9 0, 2) 1, 85( )m .

cS b hn 1/ 6 nhp cu kin: 6, 0 / 6 1, 0( )m .

1,0cS m . Tnh : ' 2 0,2 2 1,0 2,2 220cfb b S m cm .

Xc nh:

' ' '( 0,5 ) 115 220 9 (41 0,5 9) 8311050( . ) 831,11( )f b f f o fM R b h h h daN cm kNm

Ta c: 64, 04( ) 831,11( )M kNm kNm trc trung ha i qua cnh, ta tnh nh i vi

tit din ch nht.

Tnh m :


MSSV:12520801026-LP: XD12A1


71 71

3

' 2 2

64,04 100,015

11,5 220 41m b f o

M

R b h

Ta c 0,429 0,5(1 1 2 ) 0,992m R m . 3

264,04 10 5,62( )280 0,992 41s s o

MA cm

R h

. B tr

Kim tra hm lng ct thp: min5,62

100% 0,69% 0,05%20 41

s

o

A

bh

min

min maxmax

0, 05%

1150, 623 2,56%

2800b

s

R

R

Vy hm lng ct thp tha yu cu cu to.

1.2. Tnh ton ct thp dc cho dm tng 2, nhp AB, phn t 5 (bxh=200x350 mm)

T bng gi tr ni lc ta c ni lc nguy him nht cho dm:

Gi A: 43,38( )AM kNm . Gi B: 70,11( )BM kNm . Momen dng ln nht : 44, 45( )M kNm .

1.2.1. Tnh thp cho gi B (momen m)


Gi thit 4 35 4 31( )oa h h a cm .

A B

D5M=-43,38kNm M=-70,11kNmM=+44,45kNm


MSSV:12520801026-LP: XD12A1


72 72

Ti gi B, momen 70,11( )BM kNm . 6

2 2

70,11 100,317 0,429

11,5 200 310m m Rb o

M

R bh

.

0,5(1 1 2 ) 0,5(1 1 2 0,317) 0,802m . 6

2 270,11 10 1007( ) 10,07( )280 0,803 310s s o

MA mm cm

R h

Kim tra hm lng ct thp: 10,07

100% 1,62%20 31

s

o

A

bh

min max . Tha yu cu hm lng ct thp trong dm.

1.2.2. Tnh thp cho gi A (momen m):


Ti gi A c 43,38( )AM kNm 6

2 2

43,38 100,196 0,429

11,5 200 310m m Rb o

M

R bh

.

0,5(1 1 2 ) 0,5(1 1 2 0,196) 0,890m 3

243,38 10 5,62( )280 0,890 31s s o

MA cm

R h

.


100% 100% 0,91%20 31

s

o

A

bh


1.2.3. Tnh ct thp chu momen dng

i vi dm nhp AB,CD:

vn ca cnh cS . Ta c

cS b hn mt na khong cch thng thy gia cc sn dc: 0, 5 (3, 9 0, 2) 1, 85( )m .


MSSV:12520801026-LP: XD12A1


73 73

cS b hn 1/ 6 nhp cu kin: 1,8 / 6 0, 3( )m .

0,3cS m . Tnh : ' 2 0,2 2 0,3 0,8 80cfb b S m cm .


Momen dng ln nht t 44, 45M kNm

6

2 2

44, 45 100,050 0, 429

11,5 800 310m m Rb o

M

R bh

.

0,5(1 1 2 ) 0,5(1 1 2 0,050) 0,974m 3

244, 45 10 5, 26( )280 0,974 31s s o

MA cm

R h


100% 100% 0,85%20 31

s

o

A

bh



MSSV:12520801026-LP: XD12A1


74 74

Bng tnh thp dm:

Tn

phn

t

Tit din ( )

M

kNm

( )

b h

cm

m

sA

tnh

2( )cm

Chn thp sA chn

2( )cm (%)

14

Gi B 121,87 20x45 0,315 0,804 13,20 2 25 1 22 13,62 1,66 Nhp BC 64,04 220x45 0,015 0,992 5,62 2 20 6,28 0,77

Gi C 125,87 20x45 0,326 0,795 13,59 2 25 1 22 13,62 1,66

15

Gi B 109,96 20x45 0,284 0,828 11,56 1 25 2 22 12,51 1,53 Nhp BC 64,59 220x45 0,015 0,992 5,67 2 20 6,28 0,77

Gi C 113,00 20x45 0,292 0,822 11,97 1 25 2 22 12,51 1,53

16

Gi B 96,02 20x45 0,248 0,855 9,79 1 25 2 20 11,19 1,36 Nhp BC 68,07 220x45 0,016 0,992 5,98 2 20 6,28 0,77

Gi C 101,18 20x45 0,262 0,845 10,43 1 25 2 20 11,19 1,36

5

Gi A 43,38 20x35 0,196 0,890 5,62 2 20 6,28 1,01 Gi A+ 44,45 80x35 0,050 0,974 5,26 2 20 6,28 1,01 Gi B 70,11 20x35 0,317 0,802 10,07 2 25 1 22 3,62 0,58

6

Gi A- 27,96 20x35 0,126 0,932 3,46 2 20 6,28 1,01 Gi A+ 23,81 80x35 0,027 0,986 2,78 2 14 3,08 0,50 Gi B 47,16 20x35 0,213 0,879 6,18 1 25 2 22 12,51 2,02

7

Gi A- 13,59 20x35 0,061 0,968 1,62 2 14 3,08 0,50 Gi A+ 10,02 80x35 0,011 0,994 1,16 2 14 3,08 0,50 Gi B 36,68 20x35 0,166 0,909 4,65 1 25 2 20 11,19 1,80

8

Gi A 5,32 20x35 0,024 0,988 0,62 2 14 3,08 0,50 Gi B+ 20,46 80x35 0,023 0,988 2,39 2 14 3,08 0,50 Gi B- 0,82 20x35 0,004 0,998 0,09 2 14 3,08 0,50

22

Gi C- 57,38 20x35 0,260 0,847 7,81 2 25 1 22 13,62 2,20 Gi C+ 49,87 80x35 0,056 0,971 5,92 2 20 6,28 1,01 Gi D 51,33 20x35 0,232 0,866 5,83 2 20 6,28 1,01


MSSV:12520801026-LP: XD12A1


75 75

23

Gi C- 35,89 20x35 0,162 0,911 4,54 1 25 2 22 12,51 2,02 Gi C+ 30,92 80x35 0,035 0,982 3,63 2 20 6,28 1,01 Gi D 33,59 20x35 0,152 0,917 4,22 2 20 6,28 1,01

24

Gi C- 27,43 20x35 0,124 0,934 3,39 1 25 2 20 11,16 1,80 Gi C+ 11,41 80x35 0,013 0,994 1,32 2 14 3,08 0,50 Gi D 16,97 20x35 0,077 0,960 2,04 2 14 3,08 0,50

17

Gi B 38,56 20x35 0,174 0,903 4,92 2 20 6,28 1,01 Nhp BC 48,65 220x35 0,020 0,990 5,66 2 20 6,28 1,01

Gi C 52,77 20x35 0,239 0,861 7,06 2 22 7,60 1,23

25

Gi C 19,14 20x35 0,087 0,955 2,31 2 22 7,60 1,23 Gi D+ -11,06 80x35 0,013 0,994 1,28 2 14 3,08 0,50 Gi D- 22,29 20x35 0,101 0,947 2,71 2 14 3,08 0,50

39 Gi D 17,44 20x35 0,079 0,959 2,10 2 14 3,08 0,50

B tr thp:

A B C D

D14

D14

5,62(cm2)13,20(cm2)

5,62(cm2)

13,79(cm2)

5,26(cm2)

10,07(cm2)5,83(cm2)

5,92(cm2)

7,81(cm2)

13,62(cm2)225+122

13,62(cm2)125+222

6,28(cm2)220

6,28(cm2)220 6,28(cm2)

220

6,28(cm2)220

6,28(cm2)220


MSSV:12520801026-LP: XD12A1


76 76

2. Tnh ton v b tr ct ai cho dm

2.1. Tnh ton ct ai cho phn t 14, tng 2 nhp BC (bxh=200x450mm)

T kt qu ni lc ta chn ra lc ct nguy him nht cho dm: max 88,83( )Q kN

S dng b tng cp bn B20 c: 11,5 , 0,9b btR MPa R MPa

S dng thp dc nhm AII c: 280s scR R MPa

Thp ai chn thp AI c: 4

w 175 ; 21 10sR MPa E MPa Dm chu ti trng tnh ton phn b u vi:

1 01 1306,35 0,2 0,45 2500 1,1 1553,85( / ) 15,54( / cm)g g g daN m daN

Vi 01g : trng lng bn thn dm D10

Hot ti phn b u: 720 0, 625 450( / ) 4, 50( / )p daN m daN cm

Gi tr 1q :

1 0,5 15,54 0,5 4,5 17,79( / )q g p daN cm

Chn 4 45 4 41( )oa cm h h a cm

B qua nh hng ca lc dc trc 0n

Dm c phn cnh nm trong vng ko 0f

Xc nh cc tham s ca vt liu:

1 2 3 41 . 1 0,01.11,5 0,885; 2; 0,6; 1,5.b b b b bR

4 3

w0, 0, 11,5MPa,R 0,9 ,R 175 , 2,1.10 , 2,7.10 .f n b bt s s bR MPa MPa E MPa E MPa

Chn s nhnh ai: 2n

ĐỒ ÁN BTCT 2

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