A 20 storied steel frame is analyzed and design for different ductility factors (µ) = 2.5, 5, 10 and for various damage states the fragility curves are generated. All the study frames are based on the SCWB concept and analyzed and designed using PBPD method and FBD method based on current code of practice for performance levels IO, LS, and CP. The energy balance equation is used to calculate design base shear for selected seismic hazard for PBPD method, and the design lateral forces are evaluated based on the lateral load distribution as suggested by Chao et al. in Earthq Spectra 23:547–569 (2007). Yield Mechanism & Target Drift are the performance criteria in PBPD method. Comparison of all the frames designed using both the methods reveals that the frame designed using FBD method gives greater moments and huge sections, hence, they are heavier in design in comparison with PBPD method. As the ductility factor increases from µ = 2.5 to µ = 5, the sections become lighter and lighter and there is sudden increase in values of base shear, moments and forces due to the P-delta effect for µ = 10. Pushover analysis is done for the evaluation of all the frames in ETABS 2016 to study the failure pattern and hinge formation results. Generation of fragility curves using data of spectral displacement for different damage states. Results shows good performance of PBPD frames hence PBPD method is more suitable in seismic performance as well as economical for taller frames as compared to FBD method.

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Effect of Ductility Factor on Seismic Performance and Fragility of Steel MRF Designed by Performance-Based Plastic Design Method

  • Swapnali A. Karkhanis,
  • Sejal P. Dalal

摘要

A 20 storied steel frame is analyzed and design for different ductility factors (µ) = 2.5, 5, 10 and for various damage states the fragility curves are generated. All the study frames are based on the SCWB concept and analyzed and designed using PBPD method and FBD method based on current code of practice for performance levels IO, LS, and CP. The energy balance equation is used to calculate design base shear for selected seismic hazard for PBPD method, and the design lateral forces are evaluated based on the lateral load distribution as suggested by Chao et al. in Earthq Spectra 23:547–569 (2007). Yield Mechanism & Target Drift are the performance criteria in PBPD method. Comparison of all the frames designed using both the methods reveals that the frame designed using FBD method gives greater moments and huge sections, hence, they are heavier in design in comparison with PBPD method. As the ductility factor increases from µ = 2.5 to µ = 5, the sections become lighter and lighter and there is sudden increase in values of base shear, moments and forces due to the P-delta effect for µ = 10. Pushover analysis is done for the evaluation of all the frames in ETABS 2016 to study the failure pattern and hinge formation results. Generation of fragility curves using data of spectral displacement for different damage states. Results shows good performance of PBPD frames hence PBPD method is more suitable in seismic performance as well as economical for taller frames as compared to FBD method.