近断层基于损伤的结构残余位移比谱研究  

Residual displacement ratio spectrum of structure based on damage in near-fault area

作　　者：刘巴黎 胡进军[2] LIU Bali;HU Jinjun(College of Civil Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Institute of Engineering Mechanics,China Earthquake Administration(CEA),Harbin 150080,China)

机构地区：[1]湖南科技大学土木工程学院,湖南湘潭411201 [2]中国地震局工程力学研究所,哈尔滨150080

出　　处：《振动与冲击》2024年第13期70-77,共8页Journal of Vibration and Shock

基　　金：国家自然科学基金重点项目(U1939210)。

摘　　要：残余位移是震后结构损伤评估的重要指标。为了揭示近断层区域基于损伤残余位移的变化规律,基于Park-Ang损伤模型建立单自由度体系基于损伤残余位移比谱C_(r),研究恢复力模型和Park-Ang损伤模型对基于损伤C_(r)的影响,通过回归分析建立基于损伤C_(r)预测方程,对比分析了近断层和远场地震动作用下C_(r)以及基于延性和基于损伤C_(r)的差异。结果表明:具有刚度退化模型的结构C_(r)谱值小于刚度无退化模型结构的C_(r)谱值;与远场地震动作用下结构C_(r)谱值相比,近断层脉冲型地震动作用下结构C_(r)谱值在周期为1.5 s时增大40%~80%;结构基于损伤与基于延性C_(r)谱值之比大于1.1,基于延性C_(r)谱值估计趋于不保守,结构累积滞回耗能对C_(r)具有放大作用;构建的基于损伤C_(r)谱预测方程可用于近断层区域结构残余位移需求评估以及精细化结构抗震韧性评价。Residual displacement is an important index for post-earthquake structural damage assessment.Here,to reveal the variation law of structural residual displacement based on damage in near-fault area,based on Park-Ang damage model,a single-DOF system’s residual displacement ratio spectrum damage-based C_(r) was established to study effects of restoring force model and Park-Ang damage model on damage-based C_(r).A prediction equation for damage-based C_(r) was established with regression analysis.Differences of C_(r) spectral values between under near-fault seismic action and under far-field seismic action as well as differences of C_(r) spectral values between based on ductility and based on damage were analyzed contrastively.The results showed that C_(r) spectral values of structures with stiffness degradation model are smaller than those of structures without stiffness degradation model;compared with C_(r) spectral values of structures under far-field seismic action,C_(r) spectral values of structures under near-fault pulse type seismic action increase by 40~80%at a period of 1.5 sec;ratios of C_(r) spectral values based on damage to those based on ductility are larger than 1.1,estimations of C_(r) spectral values based on ductility tend to be non-conservative;the accumulated hysteresis energy dissipation of structures has an amplifying effect on C_(r);the constructed damage-based C_(r) prediction equation can be used for residual displacement demand assessment of structures in near-fault area and refined aseismic toughness evaluation of structures.

关 键 词：脉冲型地震动 远场地震动 残余位移 损伤指数 位移延性系数 

分 类 号：P315.9[天文地球—地震学]