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8/21/2019 L19 -Alternative load path method
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1|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
ALTERNATIVE LOAD PATH
METHOD
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2|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Alternative load path
Local resistance and ductility
A B
C D
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3|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Alternative load path
F
Plastic mechanism
Beam instability
Column instability
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4|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Alternative load pathEconomical approach
Requirements! t"in# resistance
! ductilit" criteria
! redundanc"
! $
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5|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Phase3
Ph
ase
2Phase
1
N
(1)
(2)
(4)
(5)
(3)
lo
lo.designN
A
AN
lo
%rame response
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6|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Phase3
Ph
ase
2Phase
1
N
(1)
(2)
(4)
(5)
(3)
lo
lo.designN
A
A
%rame response
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7|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Phase3
Ph
ase
2Phase
1
N
(1)
(2)
(4)
(5)
(3)
lo
lo.designN
A
A
%rame response
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8|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Phase3
Ph
ase
2Phase
1
N
(1)
(2)
(4)
(5)
(3)
lo
lo.designN
A
A
%rame response
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9|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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10|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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11|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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12|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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13|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
)e" parameter *or the catenar" action
K
Structural restraint K catenary action
&u'(structure test
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14|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Lateral restraint simulated '" hori+ontal ,ac-s
Calibration of the
jacks
Displacement at the jack
&u'(structure test
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15|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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16|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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17|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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18|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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19|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
-60
-40
-20
0
20
40
60
80
100
120
0 100 200 300 400 500 600 700 800 900
Deflection at the middle [mm]
Load
atth
e
verticaljac
k
[kN]
Deflection at the vertical jack [mm]Load
atthevertica
ljack[kN]
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20|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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21|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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22|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&u'(structure test
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23|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
0 40 80 120 160 200 240 280 320 360 400 440 480 520 560 600 640 680
N [kN]M[
kN]
TEST 1TEST 2
TEST 3
TEST 4
TEST 5
HOGGING
MOM
ENTS
SAGGING
MOME
NTS
TENSION
A A'
M+
M-
M(N response o* connections
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24|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
-70
-60
-50
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
0 40 80 120 160 200 240 280 320 360 400 440 480 520 560 600 640 680
N [kN]M[kN]
TEST 1
TEST 2TEST 3
TEST 4
TEST 5
Analytical prediction_fy
Analytical prediction_fu
HOGGINGMOMENTS
SAGGINGMO
MENTS
TENSION
M+
M-
M(N response o* connections
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25|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Alternative load pathEconomical approach
Requirements! t"in# resistance
! Ductilit" criteria
! Redundanc"
! $
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26|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Desi#n o* ,oints%irst philosoph" possi'l" to 'e *ollo.ed
! /apacit" desi#n o* ,oints
ro'ustness can onl" result *rom the*rame itsel*
JOINTS ARE AT LEAST ENOUGH RESISTANT THAN
THE WEAKER OT THE TWO CONNECTED MEMBERS
overstrengthed !o"nts
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27|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Joint
M
N
Member
Desi#n o* ,oints
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28|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
&econd philosoph" possi'l" to 'e *ollo.ed
! &tructural redundanc" and ductilit" o* ,oints
redundanc" and ductilit" required '"the *rame and '" the ,oints
JOINTS ARE #OSSIBL$ LESS RESISTANT THAN THE
WEAKER OT THE TWO CONNECTED MEMBERS
%&rt"&'(strength !o"nts
Desi#n o* ,oints
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29|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Joint
M
NMember
Desi#n o* ,oints
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30|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Ro'ustness requirements
! Redundanc"
! Ductilit"
in the *rame alone or
the *rame and the constitutive ,oints
Desi#n o* ,oints
|
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31|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
DERIVATION O% DE&I0NRE12IREMENT&
|O S SS O S S C S
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32|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
HIGH INDEX REQUIRED
LOW INDEX REQUIRED
Ro'ustness inde3
33|ROBUSTNESS OF STEEL STRUCTURES
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33|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Development o* anal"tical models
33
34|ROBUSTNESS OF STEEL STRUCTURES
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34|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Development o* anal"tical modelsLoad-deflection at the middle curve
-40
-30
-20
-10
0
10
2030
40
50
60
70
80
90
100
110
120
130
0 50 100 150 200 250 300 350 400 450 500 550 600 650 700 750 800
Deflection at the m iddle [m m ]
Loada
tthe
jack
[kN]
34
35|ROBUSTNESS OF STEEL STRUCTURES
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35|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
L")"t&t"on o* the s+,str+-t+re e3tracted '" Demonceau
! Valid onl" i* the normal *orce in the column a'ove the column lost isconstant
Huvelle developments -o+%'"ngs 'et.een the directl" and
indirectl" a**ected parts o* the structure and 'et.een the di**erent
store"s
35
Development o* anal"tical models
36|ROBUSTNESS OF STEEL STRUCTURES
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36|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
36
Ne. su'structure model
Development o* anal"tical models
37|ROBUSTNESS OF STEEL STRUCTURES
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37|ROBUSTNESS OF STEEL STRUCTURES
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Matla' pro#ram that allo.s the computation o* the response
o* a *rame su'mitted to a column loss
Input data4s
! num'er o* span5 num'er o* stories
! len#th o* the spans5 hei#ht o* the stories
! 'eam and columns cross sections
! E5 *"
! location o* the lost column in the *rame
37
Development o* anal"tical models
38|ROBUSTNESS OF STEEL STRUCTURES
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|O US SS O S S UC U S
European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
CAS 1 CAS 4 CAS 6
38
Development o* anal"tical models
39|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Master dissertation on
6D aspects .ithin&2&/O& pro#ram
2se o* the ne.
anal"tical methods5#enerali+ation o* the
Matla' pro#ram
39
Development o* anal"tical models
40|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Main conclusion
! The 2L# model appears to 'e accurate *or the prediction o*a 6D structure
40
Development o* anal"tical models
41|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
E3ample o* comparison
41
Development o* anal"tical models
42|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Description o* the considered su'structure and loadin#
42
Development o* anal"tical models
43|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Ma3imum d"namic displacement accordin# to the value o* the
load P 7or 18 and its rise time
Static curve
Pseudo-static curve gives themaximum displacement reached ifP is applied instantaneously.
Development o* anal"tical models
44|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
9asic simpli*ied model .as developed under the *ollo.in#
assumptions ! Ri#id(plastic model :
! 9eams are supposed to 'e in*initel" ri#id and thus -eepin# a constant len#th 5
! Plastic hin#es are su'mitted to a moment assumed to 'e constant5 interaction .ith the
a3ial load 'ein# ne#lected :
! Moderate displacements
/ sin
! cos 1
1 /2
Ener#" equation
44
Development o* anal"tical models
45|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Derivation o* requirements Availa'le resistance and ductilit" requirements
F
K
F
FR
R
46|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
Desi#n requirements trans*ormed into desi#n
#uidelinesE3ample o* such #uidelines *or ,oints
Design requirements
Fu > ..
u >
failure modes
Design guidelines for joints
percentage of reinforcement
provisions for t/d ratios
favourable failure modes
Derivation o* requirements
47|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
To ,e or not to ,e . ro,+st
48|ROBUSTNESS OF STEEL STRUCTURES
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European Erasmus Mundus Master CourseSustainable Constructions under Natural Hazards and Catastrophic Events
Robustness of structures Alternative load path method J.-F. Demonceau & J.-P. Jaspart, ULg
To ,e or not to ,e . ro,+st
