EMI2015 Presentation 02sina.sharif.edu/~dolatshahi/Papers/Conference/2015-EMI-Presentation-SL.pdfRBS...
Transcript of EMI2015 Presentation 02sina.sharif.edu/~dolatshahi/Papers/Conference/2015-EMI-Presentation-SL.pdfRBS...
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FINITE ELEMENT INVESTIGATION OF A NEW
STRUCTURAL SHEAR FUSES IN MOMENT
RESISTING FRAMES
By:Pouya Rezazadeh
(Sharif University of Technology)
Kiarash M. Dolatshahi
(Sharif University of Technology)
M. T. Nikoukalam (Presentor)
(University of Colorado Boulder)
J u n e 2 0 1 5
OUTLINE• Introduction• Motivation• Replaceable shear link in MRFs• Perforated and slit shear links• Summary and conclusion
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMESM. T. Nikoukalam
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Introduction
M. T. Nikoukalam
• Of the most favorable lateral load resisting systems are Special Moment Resisting Frames (SMRFs) due to their high ductility and energy dissipation capacity.
• A minimum span-to-depth ratio of 7 in special MRFs and 5 in intermediate MRFs must be maintained (AISC 358-10)
• The span-to-depth ratio in Framed Tube structures is about 3.4-4.
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Motivation
M. T. Nikoukalam
F F
Vpb1V
M
F F
V >Vpb2 pb1V
M
F F
V >V >Vpb3 pb2 pb1V
M
2FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Motivation
M. T. Nikoukalam
(Photo by M.T.Nikoukalam)
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Replaceable shear link in MRFs
M. T. Nikoukalam
Prefabricated in shop & shipped to site
On-site bolting of replaceable link
e
Replaceable Shear Link
Bolted End-PlateConnection
Stiffener Pls
BeamCL
• Replaceable shear link with solid web
•Slit shear link
•Perforated shear link
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Replaceable shear link in MRFsMethodology
M. T. Nikoukalam
-900
-600
-300
0
300
600
900
-0.15 -0.10 -0.05 0.00 0.05 0.10 0.15
Lin
kS
hea
r: V
(kN
)
Inelastic Rotation: γP (rad)
TestABAQUS
Vn
Vn
-800
-600
-400
-200
0
200
400
600
800
-0.15 -0.10 -0.05 0.00 0.05 0.10 0.15
Lin
kS
he
ar:
V (
kN
)
Inelastic Rotation: γp (rad)
TestABAQUS
-2.0
-1.0
0.0
1.0
2.0
-8 -6 -4 -2 0 2 4 6 8
No
rma
lize
dM
om
en
ta
tC
olu
mn
Fac
e(M
/Mp
n)
Story Drift (%)
TestABAQUS
Okazaki, M.D. Engelhardt (2007) Lee et al. (2005)
•Finite Element Modeling (Abaqus/CAE 6.13-1)
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Replaceable shear link concept in MRFsDesign Concept
M. T. Nikoukalam
θp
1 θ > θp p
2 1
Drift
Base
she
ar
0
12
DriftElastic Rapid return
to occupancyCollapse prevention
Flexuralyielding
Base
she
ar
0
1
2
Shearyielding
(a)RBS
(b)Shear Link Frame (SLF)
(a)Hybrid Frame (HF)
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Replaceable shear link concept in MRFsFrames with shear fuse
M. T. Nikoukalam
(a) L/d=4 (b) L/d=5 (c) L/d=7
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Replaceable shear link concept in MRFsAnalysis results
M. T. Nikoukalam
(I) Cyclic load-displacement curves
(II) Dissipated energy
(a) L/d=4 (b) L/d=5 (c) L/d=7
-2000
-1500
-1000
-500
0
500
1000
1500
2000
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
Shear Link
RBS
-2000
-1500
-1000
-500
0
500
1000
1500
2000
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
Shear Link
RBS
-2000
-1500
-1000
-500
0
500
1000
1500
2000
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
Shear Link
RBS
0
2
4
6
8
10
12
14
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Acc
um
ula
tiv
e E
ner
gy
Dis
sip
atio
n (
kN.m
m)
x 10
0000
Story Drift (%)
Shear Link
RBS
0
2
4
6
8
10
12
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Acc
um
ula
tive
En
erg
yD
issi
pat
ion
(kN
.mm
)x
1000
00
Story Drift (%)
Shear Link
RBS
0
2
4
6
8
10
12
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Acc
um
ula
tiv
e E
ner
gy
Dis
sip
atio
n (
kN.m
m)
x 10
0000
Story Drift (%)
Shear Link
RBS
0.0
1.0
2.0
3.0
4.0
5.0
0.0 1.0 2.0 3.0 4.0 5.0
(SL
F) P
E /
(RB
S) P
E
Story Drift (%)
L/D = 4
L/D = 5
L/D = 7
•Shear Link Frame (SLF)
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
-2000
-1500
-1000
-500
0
500
1000
1500
2000
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
Shear Link
RBS
-2000
-1500
-1000
-500
0
500
1000
1500
2000
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
Shear Link
RBS
-2000
-1500
-1000
-500
0
500
1000
1500
2000
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
Shear Link
RBS
0
2
4
6
8
10
12
14
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Acc
um
ula
tiv
e E
ner
gy
Dis
sip
atio
n (
kN.m
m)
x 10
0000
Story Drift (%)
Shear Link
RBS
0
2
4
6
8
10
12
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Acc
um
ula
tive
En
erg
yD
issi
pat
ion
(kN
.mm
)x
1000
00
Story Drift (%)
Shear Link
RBS
0
2
4
6
8
10
12
0.0 1.0 2.0 3.0 4.0 5.0 6.0
Acc
um
ula
tiv
e E
ner
gy
Dis
sip
atio
n (
kN.m
m)
x 10
0000
Story Drift (%)
Shear Link
RBS
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Replaceable shear link concept in MRFsAnalysis results
M. T. Nikoukalam
•Hybrid Frame (HF)
(I) Load-displacment curves
(II) Cumulative dissipated energy
(a) L/d=4 (b) L/d=5 (c) L/d=7
-2500-2000-1500-1000
-5000
5001000150020002500
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
RBS
Hybrid Frame
-2500-2000-1500-1000
-5000
5001000150020002500
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
RBS
Hybrid Frame
-2500-2000-1500-1000
-5000
5001000150020002500
-6.0 -4.0 -2.0 0.0 2.0 4.0 6.0
Bas
e S
hea
r (k
N)
Story Drift (%)
0
2
4
6
8
10
12
14
0.0 1.0 2.0 3.0 4.0 5.0
Acc
um
ula
tiv
e E
ner
gy
Dis
sip
atio
n (
kN.m
m)
x 10
0000
Story Drift (%)
RBSHybrid FrameLinkBeam
0
2
4
6
8
10
12
0.0 1.0 2.0 3.0 4.0 5.0
Acc
um
ula
tiv
e E
ner
gy
Dis
sip
atio
n (
kN.m
m)
x 10
0000
Story Drift (%)
RBSHybrid FrameLinkBeam
0
2
4
6
8
10
12
0.0 1.0 2.0 3.0 4.0 5.0
Acc
um
ula
tive
En
erg
yD
issi
pat
ion
(kN
.mm
)x
1000
00
Story Drift (%)
RBS
Hybrid Frame
Link
Beam
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Slit and perforated links
M. T. Nikoukalam
Model name
Perf 1 Perf 2 Perf 3 Perf 4
D/S 0.24 0.34 0.39 0.6
Vy(MPa) 316 291 278 221
Model name
SL 1 SL 2 SL 3 SL 4
b (mm) 28.13 27.73 27.50 27.72
l0 (mm) 36.54 39.06 40.44 51.34
Vy(MPa) 316 291 278 221
b
l0
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Slit and perforated links
M. T. Nikoukalam
•Damage Index (DI) Model
exp 1.5maxPEEQ = equivalent plastic strain, T = triaxiality ratio of hydrostatic stress to Mises stress)
(Chao, Khandelwal et al. (2006))
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Slit and perforated linksVerification of model
M. T. Nikoukalam
-35-25-15
-55
152535
-0.15 -0.1 -0.05 0 0.05 0.1 0.15
Lin
k S
hea
r: V
(k
N)
Link Rotation: γ (rad)
test
Pre-DI=1.0
Post-DI=1.0
0.084 rad(DI = 1.51)
DI = 1.3
DI = 1.0
DI exceeding 1 at the cycle with maximum rotation of 0.07 rad (10cm)
Damage Index
0.0000.1260.2520.3780.5030.6290.7550.8811.0071.1331.2591.3841.510
(picture by courtesy of F. Albermani)
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Slit and perforated linksVerification of model
M. T. Nikoukalam
Damage Index
0.0000.0840.1670.2510.3350.4180.5020.5860.6690.7530.8370.9201.004
DI exceeding 1 at the cycle with maximum inelastic rotation of 0.09 rad
-800-600-400-200
0200400600800
-0.15 -0.1 -0.05 0 0.05 0.1 0.15
Lin
k S
hea
r: V
(k
N)
Inelastic Rotation: γ (rad)
Test
Pre-DI=1.0
Post-DI=1.0
0.12 rad
DI = 1.3
DI = 1.0
Damage Index
0.0000.1320.2650.3970.5300.6620.7950.9271.0601.1921.3241.4571.589
DI at the point of test failure (inelastic rotation = 0.12 rad) (picture by courtesy of T. Okazaki)
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Slit and perforated linksResults
M. T. Nikoukalam
Vy/Vys = 0.83 Vy/Vys = 0.76 Vy/Vys = 0.73 Vy/Vys = 0.58
Rotation Perf1 SL1 Ratio Perf2 SL2 Ratio Perf3 SL3 Ratio Perf4 SL4 Ratio
0.006 0.006 0.061 0.102 0.008 0.061 0.129 0.009 0.082 0.115 0.007 0.075 0.093
0.015 0.022 0.167 0.129 0.028 0.171 0.163 0.029 0.230 0.127 0.023 0.241 0.095
0.046 0.080 0.621 0.128 0.098 0.638 0.153 0.107 0.850 0.126 0.090 0.895 0.100
0.080 0.165 1.020 0.161 0.190 1.043 0.182 0.204 1.357 0.150 0.177 1.496 0.118
0.129 0.299 1.404 0.213 0.331 1.413 0.234 0.359 1.830 0.196 0.401 2.018 0.199
•Link over-strength comparison
Why???? Why so low in perf?
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Slit and perforated linksResults
M. T. Nikoukalam
0
200
400
600
800
1000
0 0.05 0.1 0.15 0.2
En
erg
y (k
J)
Link Rotation: γ (rad)
Slit 2
Perf 2
-800-600-400-200
0200400600800
-0.2 -0.1 0 0.1 0.2
Lin
k S
hea
r: V
(kN
)
Link Rotation: γ (rad)
Slit 2Perf 2
•Dissipated energy comparison
Why????
Vy/Vys = 0.83 Vy/Vys = 0.76 Vy/Vys = 0.73 Vy/Vys = 0.58
Rotation Perf1 SL1 Ratio Perf/SL Perf2 SL2 Ratio Perf/SL Perf3 SL3 Ratio Perf/SL Perf4 SL4 Ratio Perf/SL
0.005 2.28 2.13 1.07 2.08 2.08 1.00 1.96 2.08 0.94 1.43 1.89 0.76
0.014 17.25 17.67 0.98 15.71 17.31 0.91 14.74 17.36 0.85 10.94 15.91 0.69
0.047 114.43 121.68 0.94 104.97 119.71 0.88 98.67 119.85 0.82 74.66 112.38 0.66
0.128 480.00 523.55 0.92 440.78 512.94 0.86 402.70 516.07 0.78 254.57 480.47 0.53
Total 878.82 1022.97 0.86 793.26 1006.47 0.79 677.97 1013.90 0.67 431.02 955.59 0.45
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Slit and perforated linksResults
M. T. Nikoukalam
•DI comparison
Why???? So high in SLIT?????!!!!!!
Vy/Vys = 0.83 Vy/Vys = 0.76 Vy/Vys = 0.73 Vy/Vys = 0.58
Rotation Perf1 SL1 Ratio Perf/SL Perf2 SL2 Ratio Perf/SL Perf3 SL3 Ratio Perf/SL Perf4 SL4 Ratio Perf/SL
0.005 0.04 0.14 0.25 0.02 0.15 0.17 0.03 0.15 0.17 0.02 0.17 0.14
0.014 0.26 1.00 0.26 0.21 1.05 0.20 0.21 1.05 0.20 0.22 1.39 0.16
0.047 1.32 6.00 0.22 1.23 6.40 0.19 1.27 6.30 0.20 1.47 8.30 0.18
0.090 2.52 11.55 0.22 2.46 12.33 0.20 2.55 11.96 0.21 4.38 16.81 0.26
0.128 5.67 19.78 0.29 4.78 21.11 0.23 8.74 20.11 0.43 11.96 29.42 0.41
0
5
10
15
20
25
30
35
0 0.05 0.1 0.15 0.2
DI
Link Rotation: γ (rad)
Slit 2
Perf 2
FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
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Summary• A new replaceable structural shear fuse is introduced and studied as an alternative to the traditional flexural fuse in moment resisting frames (MRFs)
• The new proposed shear fuse provides a high ductility capacity for MRFs, especially with low span-to-depth ratios.
• Comparing the results of RBS models revealed that frames with lower span-to-depth ratio have higher equivalent plastic strains (PEEQ) and shorter plastic hinges.
• Perforated and slit shear links are introduced as two alternative details for the shear link.
• Slit links showed higher over-strength, more energy dissipation, and higher damage index.
M. T. Nikoukalam FE INVESTIGATION OF A NEW STRUCTURAL SHEAR FUSES IN MOMENT RESISTING FRAMES
Thank You!