3.2.6 Combined Footing

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Combined Footing Analysis and DesignP1 P2

Dimensions: M1 M2

Col 1 Col 2 fy

Length, x (m) 0.40 0.45

Width, y (m) 0.40 0.45 d

Distane, x! (m) 5.5

Distane, x" (m) 0.4 Col. 1 Col. 2

Distane, xa (m) 0.# " a

Material Properties:

Con$ete st$ength, f% (M!a) 20.0 &" &! &a

'ensile st$ength, fy (M!a) 2

*llo+ soil !$ess$e, -a (Pa) 240.0 L

Loads

/e$ie Loads

Col Loads DL LL Wind - *ssme +eight of footing as 10 of olmn loads

P1(3) 5.0 25.0 0.0 0.0P2(3) 100.0 15.0 0.0 0.0

M1(36m) 0.0 0.0 0.0 0.0

M2(36m) 0.0 0.0 0.0 0.0

7ato$ed Loads

Load Case 1 2 4

P1(3) 21.50 #41.50 1#. 1#. Case 18 1.4DL 9 :.LL

P2(3) 21.50 .00 205.1 205.1 Case 28 0.DL 9 1.WL

M1(36m) 0.00 0.00 0.00 0.00 Case 8 0.5(1.4DL 9 1.LL 9 1.WL)

M2(36m) 0.00 0.00 0.00 0.00 Case 48 0.5(1.4DL 9 1.LL 9 1.#;)

Suggested Footing Dimensions

Width Left," (m) 2.0 Distane, &" (m) 0.4 Length, L (m) .0

Width + (3) 144.45 ? Wide "eam shea$ st$ength, >1 (3) 101.1 @.A.

Max. !nhing shea$, >! (3) 225.5 ? Pnhing shea$ st$ength, >2 (3) 151.5 @.A.

*$ea (m2)

*$ea (m2)


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Area o Steel

/teel Diamete$ (mm) fo$ to! $einfo$ement, 101.##

/teel Diamete$ (mm) fo$ "ot $einfo$ement, 101.##

Details

x > (3) M (36m)


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DESIGN of COMBINED FOOTING (Axially Loaded) Date: 3/11/2016 9:20

Projet: CAMP JOHN HAY MANOR 2E Mar!: CF-1

INPUT

MATE"IALS:

f'c = 20.7 MPa

Steel: fy = 414 MPa

Concrete Unit Weight: = 23.5Concrete Co!er : = 75 ""

Soil Unit Weight. : = 1

Soil #rg. Ca$ : = 47% &Pa

Main #ar: = 20 ""

(e"$. #ar : = 1 ""

FOOTING LOADS:

=

Col 1 : = 317.4 )n

= 74.57 )n

Pu = 571 )nCol 2 : = %4.%4 )n

= 23.1* )n

Pu = 1406 )n

DIMENSIONS:

= 1406.199

thic&ne++ ( = 0.7 "

length , = 4.4 "

-ith # = 1.8 "

e$th / = 1.2 "

col"n 1 col th& t = 0.3 "

col -ith = 0.5 "

col"n 2 col th& t = 0.3 "

col -ith = 0.5 "

1 = 0.01 "

2 = 2.%

3 = 1.13

reire = 2.95

$ro!ie = 7.92

SCHEMATIC DIAGRAMS :

N.G.L.

in order that the load resultant coincides w/ the

center of gravit of the footing.

If x1 or x3 is ero! in"ut must #e 0.01.

Concrete:

&6"3

&6"3

P!

P!!

P!

P!!

""2

""2

note$ "ro"er com"utations must #e done for x1 to x3

col 1

col 2


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OUTPUT:

SOIL P"ESS#"ES:

net = 453.886 &Pa

lt = 249.66 &Pa

W+hort = 781.22 &6"

Wlong = 449.39 &6" "u

= 565.00 ""

= 555.00 ""ff. With8 = 1147.50 ""

MOMENTS:

A#$%& #$%& '()*+,($%:

9center of col. 1 : = 0.03 &"

et-een col"n+: = -271.54 &"

9center of col. 2 : = 458.66 &"

A#$%& $), '()*+,($%:

9 face of col"n: = 165.03 &"

S$EA"S:A#$%& #$%& '()*+,($%:

9 left ;ace of col1 = 4.49 &

9 right ;ace of col1 = -431.82 &

9 left ;ace of col2 = 770.31 &

9 right ;ace of col2 = -501.07 &

ACT#AL ST"ESSES %&' ALLOABLE :

= 0.63 MPa

= 1.52 MPa &afe aai*&t +,*-i* &-ear.

= 0.60 MPa

= 0.76 MPa &afe aai*&t /ea0 &-ear.

=

actal ftg.-t. 188.34 &

(otal Weight 1528.3 &

ctal Soil Pre++re 192.97 &Pa

ll. Soil Pre++re 478.00 &Pa

At,al &oil +re&&,re i& le&& t-a* allo1a/le2 Safe.

AOPT: 1.8 4.4 0.7 o0/i*ed footi*

! T

"EINFO"CEMENTS:

A#$%& !$%& ()*+,($%:

A&3 4 5657'3586 P)$('* 11 + -- 20 - $,,$ )

A&9 4 5657'3586 P)$('* 11 + -- 20 - ,$ )

T**),u)* ): P)$('* 16 150 $% +*%,*)

A#$%& $), ()*+,($%:

A&5 4 935';635 P)$('* 7 + -- 20 - $,,$ )

T**),u)* ): P)$('* 16 150 $% +*%,*)

Pu Pu

ff. Pa?ial

P,$,#

+,u#

##$;

""2

""2

""2


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(/20

+$#u%

/% +$#u%.

;(,(% *


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C@M3D 7@@'3E

I%PU+ DA+A: , -&.

Con$ete /t$ength, f% B 2. MPa

/teel Field /t$ength, fy B 414 MPa


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+7IC8%(SS:

'! B III 3

2240.# 3

III 3

9

t sae or punching shear

check or beam shear:

B 1215.0 mm.

P+/+AL

6

"o B 4( 9d) B

-*>

B ! B

φ>! B

up cp

dL B d

*> 9 φK2


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1# 224

1.00 .225 1.0

54. 3Km

0. 0.

;-5


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C@M3D 7@@'3E

I%PU+ DA+A: , -&.

Con$ete /t$ength, f% B 2. MPa

/teel Field /t$ength, fy B 414 MPa


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+7IC8%(SS:

'! B III 3

2240.# 3

III 3

9

t sae or punching shear


B 1215.0 mm.

P+/+AL

6

"o B 4( 9d) B

-*>

B ! B

φ>! B

up cp

dL B d

*> 9 φK2


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1# 224

1.00 .225 1.0

54. 3Km

0. 0.

;-5


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12

C/M.I%(D F//+I%0

$ete /t$ength, f% B 2# MPa

l Field /t$ength, fy B 414 MPa

edtion fato$, φ BIII (fo$ Gex$e) 2.50

φ BIII(fo$ shea$)

Colmn siHe, " B 00 mm

h B 00 mm

e /oil P$ess$e, Ps BIIIsf

B 12 Pa

t Weight of /oil, B 1 I

2<

III 3 III 3

III 3 III 3 <

;- k% ;- k%

h B II m. 551

t B II m.

BIIIPa

II

* B length x +idth

L B II m

W B II m

say W B 1.5 m

ω/@L 3Km

mm2

PDL

B PDL

B

PLL

B PLL

B

PJB P

JB

P+/+AL

6 P+/+AL

6

llo+a"le -3'

B Ps 6 (ωsoil

x h) 6 (ω

on$etex t)

*


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+7IC8%(SS:

'! B 5.01 3

111.2 3

11.2 3

9

t ae or punching she


B 12.5 mm.

P+/+AL

6

"o B 4( 9d) B

-*>

B ! B

φ>! B

up cp

dL B d

*> 9 φK2


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3 12 3

5.00 2.50

220.#4 3Km

I

==;>2<

<

@==;>2<

BBB


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3.2.6 Combined Footing

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