张永群,庞云升,蒋利学. 序列型地震下钢筋混凝土框架结构的易损性分析[J].河南理工大学学报(自然科学版)，doi:10.16186/j.cnki.1673-9787.2025020019.

ZHAGN Y Q, PANG Y S, JIANG L X. Seismic fragility analysis of reinforced concrete frame structures subjected to sequence-type ground motions [J]. Journal of Henan Polytechnic University( Natural Science) ， doi: 10.16186/j.cnki.1673-9787. 2025020019.

序列型地震下钢筋混凝土框架结构的易损性分析(网络首发)

张永群1，庞云升2，蒋利学1

1. 上海市建筑科学研究院有限公司 上海市工程结构安全重点实验室，上海 200032；2. 同济大学 土木工程学院，上海 200092

摘要: 目的 一次强烈地震后往往伴随多次强余震，序列型地震会产生累积损伤效应，导致经历主震作用后的建筑结构在余震作用下产生更严重的损伤，然而现有规范在确定设计地震动参数时仅考虑了单次地震作用。鉴于此，量化分析序列型地震下钢筋混凝土（RC）框架结构的易损性具有重要意义。方法 本文以一栋5层既有钢筋混凝土框架结构为研究对象建立了有限元模型，并通过振动台试验数据验证了有限元模型的准确性；选取25条实际台站记录到的真实序列型地震动记录作为结构响应分析的输入激励，基于增量动力分析方法研究RC框架结构的非线性响应，建立序列型地震下RC框架结构的易损性曲线，分析余震强度的影响。结果 地震激励下的结构有限元模型的顶点位移响应预测值与振动台试验结果吻合良好，满足工程精度要求；当余震相对强度系数不超过0.4时，序列型地震和主震下钢筋混凝土框架结构的易损性差异很小，表明此时余震作用的影响很小，可以忽略，当余震相对强度系数超过0.6时，序列型地震和主震下结构易损性的差异大于10%，表明此时余震作用显著，应考虑余震效应；主震后结构损伤较小时，余震造成的结构损伤增量较小，主震后结构损伤严重时，余震造成的结构损伤增量有显著增加。结论 因此，当余震相对强度较大时，或主震后结构损伤严重时，余震的影响显著，应考虑序列型地震对建筑结构抗震性能的影响。

关键词:序列型地震；钢筋混凝土框架结构；有限元分析；极限状态；易损性分析

doi: 10.16186/j.cnki.1673-9787.2025020019

基金项目: 国家重点研发计划项目（2023YFC3805000）；上海市自然科学基金(24ZR1460800)；上海市住房和城乡建设管理委员会科研项目（沪建科2024-002-029）

收稿日期：2025-02-20

修回日期：2025-05-07

网络首发日期：2026-07-20

Seismic fragility analysis of reinforced concrete frame structures subjected to sequence-type ground motions (Online)

Zhang Yongqun1, Pang Yunsheng2, Jiang Lixue1

1. Shanghai Key Laboratory of Engineering Structure Safety, Shanghai Research Institute of Building Sciences Co., Ltd., Shanghai 200032, China;2. College of Civil Engineering, Tongji University, Shanghai 200092, China

Abstract: Objectives A strong earthquake is often followed by multiple aftershocks. Sequence-type ground motions can generate cumulative damage effects, leading to more severe structural damage in building structures that have already been subjected to mainshocks. However, current design codes only consider single seismic events when determining seismic design parameters. Therefore, quantitative analysis of the seismic fragility of reinforced concrete (RC) frame structures under sequence-type ground motions holds significant importance. Methods A finite element model was developed for a 5-story existing RC frame structure and validated using shaking table test data. Twenty-five real sequence-type ground motion records from actual stations were selected as input excitations for structural response analysis. The nonlinear response of RC frame structures is investigated based on the Incremental Dynamic Analysis (IDA) method. Fragility curves for RC frame structures under sequence-type ground motions are established, and the influence of aftershock intensity is analyzed. Results The predicted peak displacement response of the finite element model under seismic excitation aligned well with the shaking table test results, meeting engineering accuracy requirements. When the relative intensity coefficient of aftershocks did not exceed 0.4, the difference in seismic fragility of structures between sequence-type ground motions and the mainshock was negligible, indicating minimal aftershock impact. However, when the relative intensity coefficient exceeded 0.6, the difference in seismic fragility of structures exceeded 10%, demonstrating significant aftershock effects that warrant consideration. Additionally, aftershocks caused minor incremental structural damage when post-mainshock damage was limited, but the incremental damage increased substantially when the post-mainshock damage was severe. Conclusions When the relative intensity coefficient of aftershocks is high, or when structural damage after the mainshock is severe, the influence of aftershocks becomes significant. In such cases, the impact of sequence-type ground motions on the seismic performance of building structures must be considered in design and analysis.

Key words: sequence-type ground motions; reinforced concrete frame structure; FEM analysis; limit state; fragility analysis