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Steel and Composite Structures Volume 49, Number 1, October 10 2023 , pages 047-64 DOI: https://doi.org/10.12989/scs.2023.49.1.047 |
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Response modification and seismic design factors of RCS moment frames based on the FEMA P695 methodology |
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Mohammad H. Habashizadeh, Nima Talebian, Dane Miller, Martin Skitmore and Hassan Karampour
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| Abstract | ||
| Due to their efficient use of materials, hybrid reinforced concrete-steel (RCS) systems provide more practical and economic advantages than traditional steel and concrete moment frames. This study evaluated the seismic design factors and response modification factor 'R' of RCS composite moment frames composed of reinforced concrete (RC) columns and steel (S) beams. The current International Building Code (IBC) and ASCE/SEI 7-05 classify RCS systems as special moment frames and provide an R factor of 8 for these systems. In this study, seismic design parameters were initially quantified for this structural system using an R factor of 8 based on the global methodology provided in FEMA P695. For analyses, multi-story (3, 5, 10, and 15) and multi-span (3 and 5) archetypes were used to conduct nonlinear static pushover analysis and incremental dynamic analysis (IDA) under near-field and far-field ground motions. The analyses were performed using the OpenSees software. The procedure was reiterated with a larger R factor of 9. Results of the performance evaluation of the investigated archetypes demonstrated that an R factor of 9 achieved the safety margin against collapse outlined by FEMA P695 and can be used for the design of RCS systems. | ||
| Key Words | ||
| collapse safety assessment; FEMA P695; RCS systems; response modification factor | ||
| Address | ||
| Mohammad H. Habashizadeh:Department of Civil Engineering, Islamic Azad University- Marand Branch, Marand, East Azarbaijan, Iran Nima Talebian, Dane Miller and Martin Skitmore:School of Sustainable Development, Faculty of Society and Design, Bond University, Robina, QLD 4226, Australia Hassan Karampour:School of Engineering and Built Environment, Griffith University, Southport, QLD 4215, Australia | ||