Volume 15, Issue 4 (11-2025)
IJOCE 2025, 15(4): 643-677 |
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Arjmand M, Naderpour H, Kheyroddin A. SEISMIC FRAGILITY AND RESILIENCE ASSESSMENT OF OPTIMALLY RETROFITTED RC FRAMES WITH NONLINEAR VISCOUS DAMPERS UNDER PARK–ANG DAMAGE CONSTRAINTS. IJOCE 2025; 15 (4) :643-677
URL: http://ijoce.iust.ac.ir/article-1-659-en.html
URL: http://ijoce.iust.ac.ir/article-1-659-en.html
1- Department of Civil Engineering, Bozorgmehr University of Qaenat, Iran
2- Faculty of Civil Engineering, Semnan University, Semnan, Iran
2- Faculty of Civil Engineering, Semnan University, Semnan, Iran
Abstract: (2452 Views)
The seismic resilience of existing reinforced concrete (RC) buildings can be improved by optimizing both energy dissipation and post-earthquake recovery. This study proposes a practical framework for upgrading RC moment-resisting frames using nonlinear fluid viscous dampers (NFVDs). Two typical frames, a four-story and an eight-story structure, were modeled and analyzed in OpenSees. Nonlinear time-history analyses with seven earthquake records were carried out to estimate the Park–Ang damage index, while incremental dynamic analyses (IDA) with 22 far-field records from FEMA P695 were used to evaluate fragility and collapse performance. The NFVDs were represented through a velocity-dependent Maxwell model, and the optimal damper parameters and locations were determined through a cost-based single-objective optimization scheme under predefined damage limits. The results show that the optimized damper configurations effectively reduced structural damage and improved post-event functionality recovery under seismic hazard levels corresponding to 10% and 2% probabilities of exceedance in 50 years. Overall, the proposed approach provides an efficient and economical solution for improving the seismic performance and resilience of existing RC frame buildings.
Keywords: Seismic resilience, Nonlinear viscous damper, Park–Ang damage index, Fragility curve, Optimization, Reinforced concrete frame
Type of Study: Research |
Subject:
Optimal design
Received: 2025/11/4 | Accepted: 2025/12/29 | Published: 2025/12/31
Received: 2025/11/4 | Accepted: 2025/12/29 | Published: 2025/12/31
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