Assessment of low-cycle fatigue damage in seismic performance-based optimally designed reinforced concrete frames under mainshock-aftershock sequences

Date

2026-02-01

Author

Razavi, Navid
Gholizadeh, Saeed
Hasançebi, Oğuzhan

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This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

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This study examines low-cycle fatigue (LCF) damage in performance-based design (PBD) optimized reinforced concrete moment-resisting frames (RC MRFs) subjected to seismic loading, with a specific focus on mainshockaftershock sequences. The primary objective is to assess the impact of these sequences on the fatigue life of RC MRFs utilizing an optimization framework that integrates seismic vulnerability assessments and low-cycle fatigue evaluation. Two RC MRFs, 5- and 10-story, are designed under varying seismic conditions in the PBD framework. Results indicate that in the 5-story RC MRF, LCF damage is concentrated in the first and second stories. In contrast, the 10-story RC MRF exhibits more widespread LCF damage, particularly in the middle and upper stories. The findings further demonstrate that optimizing RC MRF through the PBD-based safety enhancement can reduce LCF damage compared to conventional designs, resulting in significant improvements in structural resilience and damage mitigation. For the 5-story RC MRF, the maximum LCF damage index is effectively reduced to 51%, 88%, and 36% for the three respective scaling methods, while these reductions for the 10-story RC MRF are 98%, 36%, and 21%. These results highlight the need to consider mainshock-aftershock sequences in seismic design optimization to enhance fatigue resistance and structural safety.

URI

https://hdl.handle.net/11511/118558

Collections

Department of Civil Engineering, Article