Assessment of Seismic Collapse Capacity in Special Moment-Resisting Frames Designed via Equivalent Lateral Force and Response Spectrum Procedures Under ASCE 7-22 and FEMA P-695 Frameworks

Rashvand, Parsa; Hamidia, Mohammad Javad; Hassani, Nemat

doi:10.48308/ijce.2025.107012

Assessment of Seismic Collapse Capacity in Special Moment-Resisting Frames Designed via Equivalent Lateral Force and Response Spectrum Procedures Under ASCE 7-22 and FEMA P-695 Frameworks

Document Type : Original Article

Authors

Faculty of Civil, Water, and Environmental Engineering, Shahid Beheshti University, Tehran, Iran

10.48308/ijce.2025.107012

Abstract

Steel special moment-resisting frame (SMRFs) are considered one of the most widely used seismic force-resisting systems in earthquake-prone regions, designed to provide high ductility and energy dissipation capacity. In this study, the effect of the initial structural design method on the collapse capacity of this system was investigated. For this purpose, three structures with 2, 4, and 8 stories were designed in accordance with the provisions of ASCE 7-22 using both the equivalent lateral force (ELF) method and the response spectrum analysis (RSA) method in ETABS software, and the required member sections were obtained. Subsequently, the developed models were transferred to the OpenSees platform and subjected to modal analysis, nonlinear static analysis, and incremental dynamic analysis (IDA). For the Incremental Dynamic Analysis, 44 far-field earthquake ground motion records recommended in FEMA P695 were employed. In total, more than 9,000 nonlinear time-history analyses were conducted to develop fragility curves and calculate the collapse margin ratio (CMR). The obtained results indicate that the initial analysis and design method has a significant effect on the final nonlinear structural response and the probability of collapse at high seismic intensity levels. In all models, structures designed using the equivalent lateral force method exhibited higher collapse margin ratios compared to those designed using the response spectrum analysis method, indicating greater seismic capacity and higher safety margins against collapse.

Keywords

References

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