考虑碰撞效应的土-单层隔震结构的损伤性能分析

摘要

建立考虑碰撞效应的土-单层隔震结构分析模型,采用利用离散弹簧模拟土-结构相互作用并采用Kelvin模型模拟了隔震层的碰撞受力行为特征,分别考虑上部结构及隔震层的非线性特性,采用Park-Ang损伤模型定义了上部结构的损伤指数,采用近远场地震波作为输入对土-隔震系统进行了弹塑性时程反应分析.研究结果表明:无论是否发生碰撞,SSI效应对隔震结构损伤有一定影响;当发生碰撞时,SSI效应的影响较为显著,且结构损伤值对近断层地震波较敏感.研究结果可为隔震结构计算分析提供参考.%Analysis model for soil-single-storey isolated structure is established.Spring-dashpot elements have been incorporated to simulate the soil-structure interaction (SSI).A Kelvin viscoelastic pounding force model has been employed in order to effectively capture impact forces of isolation layer during collisions.Nonlinear properties of superstructure and isolation layer are considered.Based on Park-Ang damage model,superstructure damage index is defined.Plastic-elastic time history analysis for the single story isolated structure has been done under near and far fault waves.It is concluded that no matter whether the collision happens,the effect of SSI on damage index of the isolated structure is significant.The effect of SSI on damage index values for the isolated structure is more obvious when impact occurs.The structure damage values are more sensitive to near-fault seismic wave compared with far-fault ground motions.The research results can provide a reference for calculation analysis of seismic isolated structure.