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Cr，研究恢复力模型和Park-Ang损伤模型对基于损伤Cr的影响，通过回归分析建立基于损伤Cr预测方程，对比分析了近断层和远场地震动作用下Cr以及基于延性和基于损伤Cr的差异。结果表明：具有刚度退化模型的结构Cr谱值小于刚度无退化模型结构的Cr谱值；与远场地震动作用下结构Cr谱值相比，近断层脉冲型地震动作用下结构Cr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Cr谱值之比大于1.1，基于延性Cr谱值估计趋于不保守，结构累积滞回耗能对Cr具有放大作用；构建的基于损伤Cr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。
Abstract
Residual displacement is an important indicator for structural damage assessment under seismic excitation. In order to reveal the variation law of the damage-based residual displacement in near fault area, the residual displacement ratio spectrum, that is Cr, of single degree of freedom (SDOF) systems was established based on the Park-Ang damage model. The results were statistically organized to evaluate the effect of damage model and hysteretic model on damage-based Cr. The prediction equation was proposed to estimate damage-based Cr of SDOF systems subjected to near-fault pulse-like ground motions by regression analysis. The differences of damage-based Cr subjected to near-fault pulse-like ground motions and damage-based Cr far-field ground motions, and the differences of Cr based on damage approach and Cr ductility approach were compared and analyzed. Results show that the damage-based Cr of stiffness-degrading systems are smaller than those of non-degrading systems. Compared with the damage-based Cr of SDOF systems subjected to far-field ground motions, the damage-based Cr of SDOF systems subjected to near-fault pulse-like ground motions increase by 40%~80% at period of approximately 1.5 s. Ratios of damage-based Cr to ductility-based Cr are greater than 1.1, which indicates that the ductility-based Cr tend to be unconservative compared to the damage-based ones, and that cumulative hysteretic energy consumption has an amplifying effect on Cr of SDOF systems. The prediction equation for damage-based Cr can be applied to residual displacement demand and refined seismic resilience evaluation of structures in near fault area.
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
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Key words
pulse-like ground motion /
far-field ground motion /
residual displacement /
damage index /
displacement ductility coefficient
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