单自由度体系的地震残余变形研究

Residual displacement of SDOF system under earthquakes

结构在经受地震动作用后会发生变形和位移,其中在震动结束后不能恢复的这一部分,即为残余变形或永久变形。残余变形取决于结构本身的动力性能和输入地震波的特性以及场地条件等。残余变形能够提供震害评估的信息,同时也是震后加固修复的指标。对单自由度体系进行了研究,考察不同自振周期、阻尼比、延性水准、滞回特性以及输入地震动下的残余变形,得到其影响因素并分析其中机理,为以最大变形和累积耗能为依据的基于性能的抗震工程学提供了补充和新的思路。

Structure subjected to strong earthquakes may produce residual deformation displacements.The amount of the residual or permanent displacement is determined by structural characteristics,including mass and hysteretic behavior,as well as ground motion.The residual displacement can provide the information of the earthquake disaster assessment of the structure and the indices of strengthening and repairing structure after earthquakes.This paper describes analyses of many single-degree-of-freedom bilinear oscillators with different natural periods,damping ratios,ductility factors,bilinear factors,and input ground motions.