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Steel4 - A Versatile Uniaxial Material Model for Cyclic Nonlinear Analysis of Steel-based Elements

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Presentation made by Dr. Adam Zsarnoczay @ University of Porto during the OpenSees Days Portugal 2014 workshop

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Steel4 - A Versatile Uniaxial Material Model for Cyclic Nonlinear Analysis of Steel-based Elements

  1. 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
  2. 2. OVERVIEW Modeling Structural Steel for Nonlinear Seismic Assessment with Steel4 11/07/2014 2
  3. 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. 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. 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. 6. NONLINEAR STATIC ANALYSIS SINGLE BRACE model: result: pure material behavior ~ tensile test of steel material Zsarnóczay 2013 11/07/2014 6
  7. 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. 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. 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. 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. 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. 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
  13. 13. NONLINEAR STATIC ANALYSIS BRACED FRAME model: concentrically braced frame, 4 stories, pinned columns result: capacity curve (roof drift vs. base shear) Gulyás 2013 11/07/2014 13
  14. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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
  33. 33. NONLINEAR DYNAMIC ANALYSIS BUCKLING RESTRAINED BRACE anti-seismic device with stable cyclic behavior Zsarnóczay 2013 11/07/2014 33
  34. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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

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