Seismic evaluation of rc frame with brick masonry infill wallseSAT Journals
Abstract
Infill panels are widely used as partition walls as well as external walls of the building to fill the gap between RC frames. Non-structural member may provide considerable stiffness to the building and hence may improve the performance of the RC building during ground motions. But In most of the cases, the ignorance of this property of masonry in designing of the RC frame may get an unsafe design. There are two methods are used to determine the effect of ground motion. The effect of ground motion on RC frame building has been carried out by considering with and without the stiffness of infill wall. A comparative study is carried out with RC building using Equivalent Lateral Force method and Response Spectrum method. The masonry infill has been modeled as an equivalent diagonal strut element using Hendry formula. Pushover analysis is carried out on bare frame and frame with infill wall. The model has been generated using STAAD Pro and results obtained from the analysis are compared in terms of strength and stiffness with bare frame.
Keywords: Seismic evaluation, Response Spectrum, masonry infill, diagonal strut.
Seismic evaluation of rc frame with brick masonry infill wallseSAT Journals
Abstract
Infill panels are widely used as partition walls as well as external walls of the building to fill the gap between RC frames. Non-structural member may provide considerable stiffness to the building and hence may improve the performance of the RC building during ground motions. But In most of the cases, the ignorance of this property of masonry in designing of the RC frame may get an unsafe design. There are two methods are used to determine the effect of ground motion. The effect of ground motion on RC frame building has been carried out by considering with and without the stiffness of infill wall. A comparative study is carried out with RC building using Equivalent Lateral Force method and Response Spectrum method. The masonry infill has been modeled as an equivalent diagonal strut element using Hendry formula. Pushover analysis is carried out on bare frame and frame with infill wall. The model has been generated using STAAD Pro and results obtained from the analysis are compared in terms of strength and stiffness with bare frame.
Keywords: Seismic evaluation, Response Spectrum, masonry infill, diagonal strut.
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Vaccine management system project report documentation..pdfKamal Acharya
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Steel4 - A Versatile Uniaxial Material Model for Cyclic Nonlinear Analysis of Steel-based Elements
1. BUDAPEST UNIVERSITY OF TECHNOLOGY AND ECONOMICS
DEPARTMENT OF STRUCTURAL ENGINEERING
Steel4
A Versatile Uniaxial Material Model
for Cyclic Nonlinear Analysis of Steel-Based
Elements
Ádám Zsarnóczay
László Gergely Vigh
OpenSees Days 2014
Porto, Portugal
3. OVERVIEW
Modeling Structural Steel for Nonlinear Seismic Assessment
nonlinear static analysis - pushover
with
single brace - monotonic loading
braced frame - monotonic loading
Steel4
11/07/2014 3
4. OVERVIEW
Modeling Structural Steel for Nonlinear Seismic Assessment
nonlinear static analysis - pushover
with
single brace - monotonic loading
braced frame - monotonic loading
nonlinear dynamic analysis – time history IDA
single brace - cyclic loading
single brace - dynamic loading
braced frame - dynamic loading
Steel4
modeling buckling restrained braces
11/07/2014 4
5. OVERVIEW
Modeling Structural Steel for Nonlinear Seismic Assessment
nonlinear static analysis - pushover
with
single brace - monotonic loading
braced frame - monotonic loading
nonlinear dynamic analysis – time history IDA
single brace - cyclic loading
single brace - dynamic loading
braced frame - dynamic loading
modeling buckling restrained braces
Steel4
11/07/2014 5
6. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
Zsarnóczay 2013
11/07/2014 6
7. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
compare typical approaches using materials from OpenSees:
Zsarnóczay 2013
11/07/2014 7
8. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
compare typical approaches using materials from OpenSees:
11/07/2014 8
9. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
compare typical approaches using materials from OpenSees:
11/07/2014 9
10. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
compare typical approaches using materials from OpenSees:
11/07/2014 10
11. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
compare typical approaches using materials from OpenSees:
Ultimate
Strength
Limit
11/07/2014 11
12. NONLINEAR STATIC ANALYSIS SINGLE BRACE
model:
result: pure material behavior ~ tensile test of steel material
compare typical approaches using materials from OpenSees:
11/07/2014 12
14. NONLINEAR STATIC ANALYSIS BRACED FRAME
model: concentrically braced frame, 4 stories, pinned columns
result: capacity curve (roof drift vs. base shear)
compare typical approaches using materials from OpenSees:
Gulyás 2013
11/07/2014 14
15. OVERVIEW
Modeling Structural Steel for Nonlinear Seismic Assessment
nonlinear static analysis - pushover
with
single brace - monotonic loading
braced frame - monotonic loading
nonlinear dynamic analysis – time history IDA
single brace - cyclic loading
single brace - dynamic loading
braced frame - dynamic loading
modeling buckling restrained braces
Steel4
11/07/2014 15
16. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – CYCLIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using experimental results
uniaxial loading
Shi, Wang, Wang 2011 Martinovich 2013
11/07/2014 16
17. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – CYCLIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using experimental results
bending
Takanashi 1973
Martinovich 2013
11/07/2014 17
18. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – CYCLIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using experimental results
buckling
Wakabayashi, Nakamura, Yoshida 1977
Martinovich 2013
11/07/2014 18
19. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – CYCLIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using experimental results
buckling
use as reference solution
Wakabayashi, Nakamura, Yoshida 1977
Martinovich 2013
11/07/2014 19
20. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – CYCLIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using experimental results use as reference solution
Combined
Isotropic & Kinematic
Hardening
11/07/2014 20
21. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – CYCLIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using experimental results use as reference solution
Nonlinear Isotropic Hardening
Zsarnóczay 2013
11/07/2014 21
22. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results
response of SDOF system to a real ground motion record
solid model + complex 3D material in ANSYS
vs.
truss model + Steel4 in OpenSees
Zsarnóczay, Budaházy 2013
11/07/2014 22
23. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results
use as reference solution
response of SDOF system to a real ground motion record
solid model + complex 3D material in ANSYS
vs.
truss model + Steel4 in OpenSees
Zsarnóczay, Budaházy 2013
11/07/2014 23
24. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
San Fernando EQ rec. from PEER NGA Database:
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results use as reference solution
Memory of Load History
11/07/2014 24
25. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
San Fernando EQ rec. from PEER NGA Database:
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results use as reference solution
Memory of Load History
11/07/2014 25
26. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
San Fernando EQ rec. from PEER NGA Database:
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results use as reference solution
Memory of Load History
11/07/2014 26
27. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
San Fernando EQ rec. from PEER NGA Database:
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results use as reference solution
Memory of Load History
Filippou, Popov, Bertero 1983
11/07/2014 27
28. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
San Fernando EQ rec. from PEER NGA Database:
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results use as reference solution
error in: maximum displacement
error in: maximum stress
error in: residual displacement
error in: energy dissipation
11/07/2014 28
29. NONLINEAR DYNAMIC ANALYSIS SINGLE BRACE – DYNAMIC LOADING
model: kihajásbiztos merevítőrudak
San Fernando EQ rec. from PEER NGA Database:
result: hysteresis curves describe cyclic hardening, energy dissipation
verification of Steel4 using advanced numerical results use as reference solution
error in: maximum displacement
error in: maximum stress
error in: residual displacement
error in: energy dissipation
11/07/2014 29
30. NONLINEAR DYNAMIC ANALYSIS BRACED FRAME
model: concentrically braced frame, 4 stories, pinned columns
imperfect brace geometry
load: San Fernando EQ rec. from PEER NGA Database:
11/07/2014 30
31. NONLINEAR DYNAMIC ANALYSIS BRACED FRAME
model: concentrically braced frame, 4 stories, pinned columns
imperfect brace geometry
load: San Fernando EQ rec. from PEER NGA Database:
11/07/2014 31
32. OVERVIEW
Modeling Structural Steel for Nonlinear Seismic Assessment
nonlinear static analysis - pushover
with
single brace - monotonic loading
braced frame - monotonic loading
nonlinear dynamic analysis – time history IDA
single brace - cyclic loading
single brace - dynamic loading
braced frame - dynamic loading
Steel4
modeling buckling restrained braces
11/07/2014 32
34. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACE
anti-seismic device with stable cyclic behavior
Steel4 calibrated to 15 experimental results
parameters defined as functions of BRB geometry
parameters defined as functions of basic material properties
general model of the tested type of BRB
primary challenge:
Asymmetric Hardening
11/07/2014 34
35. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACE
modified the Menegotto-Pinto formula to properly model
the Bauschinger effect under limited hardening (fu )
the influence of non-symmetric hardening on the yield surface
works for isotropic, kinematic or their combination!
primary challenge:
Asymmetric Hardening
11/07/2014 35
36. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACED FRAME
influence of BRB model on the seismic performance of a BRBF
archetype numerical model
11/07/2014 36
37. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACED FRAME
influence of BRB model on the seismic performance of a BRBF
BRB material
numerical model
11/07/2014 37
38. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACED FRAME
influence of BRB model on the seismic performance of a BRBF
BRB material
numerical model
BRB response
11/07/2014 38
39. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACED FRAME
influence of BRB model on the seismic performance of a BRBF
BRB material
Incremental Dynamic Analysis
BRB response IDA and fragility curves based on FEMA P695
11/07/2014 39
40. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACED FRAME
influence of BRB model on the seismic performance of a BRBF
BRB material
BRB response IDA and fragility curves based on FEMA P695
11/07/2014 40
41. SUMMARY
Steel4 – primary features:
nonlinear kinematic hardening
nonlinear isotropic hardening
ultimate strength limit
asymmetric hardening
load history memory
accurate and efficient
Acknowledgement
behavior verified by
laboratory tests and virtual experiments
This research was supported by the János Bolyai Research Scholarship of the Hungarian
Academy of Sciences.
11/07/2014 41
42. SUMMARY
behavior verified by
laboratory tests and virtual experiments
Steel4 – primary features:
nonlinear kinematic hardening
nonlinear isotropic hardening
ultimate strength limit
asymmetric hardening
load history memory
accurate and efficient
Acknowledgement
This research was supported by the János Bolyai Research Scholarship of the Hungarian
Academy of Sciences.
thank you for your attention
11/07/2014 42
43. References
Gulyás Gy 2013, Reliability analysis of steel building structures in high seismicity zones – Analysis of
quasi-elastic and dissipative concentrically braced frames - MSc Thesis, BME Department of Structural
Engineering, Budapest (in Hungarian)
Filippou FC, Popov EP, Bertero VV 1983, Effects of bond deterioration on hysteretic behavior of
reinforced concrete joints. EERC report, University of California, Berkeley, CA
Martinovich K 2013, Verification of structural steel material model developed to nonlinear seismic
analysis, Master Theses, BME Department of Structural Engineering,(in Hungarian)
Shi Y, Wang M, Wang Y 2011, Experimental and constiutive model study of structural steel under cyclic
loading, Journal of Constructional Steel Research, 67, 1185-1197
Takanashi K 1973, Inelastic lateral buckling of steel beams subjected to repeated and reversed loadings
Proc. 5th World Conf. Earthquake Engineering. Vol. 1, 795-798, International Association fo Eartquake
Engineering, Rome, Italy
Wakabayashi M, Nakamura T, Yoshida N. 1977, Experimental studies on the elastic-plastic behavior of
braced frames under repeated horizontal loading. Part 1 Experiments of braces with an H-shaped cross
section in a frame, Kyoto: Bulletin of the Diaster Prevention Research Institute, 27(3), 121-154
Zsarnóczay Á 2013, Experimental and Numerical Analysis of Buckling Restrained Braced Frames for
Eurocode Conform Design Procedure Evaluation – PhD Dissertation, BME Department of Structural
Engineering, Budapest
Zsarnóczay Á, Budaházy V 2013, Uniaxial material model development for nonlinear response history
analysis of steel frames, Proc. 2nd Conference of Junior Researchers in Civil Engineering, pp. 307-317
