近断层地震下不规则串联隔震结构的倒塌模拟

摘要

The serial isolation structures are currently more common around the world. Its safety has been widely concerned. The serial isolation structures of the natural period are long, so the near-fault seismic motion on the seismic performance of serial isolation structures has an adverse effect. This paper analyzes the seismic performance and the collapse simulation of plane irregular serial isolation structures subjected to near-fault seismic motion. Plane irregular serial isolation structure model and non-isolated structure model are established based on MSC. MARC. Different seismic motions were chosen as input to analyze non-linear simulation of these two structures. the dynamic response of plane irregular serial isolation structure and non-isolated structure subjected to near-fault seismic motion were compared. Isolation and non-isolated structure collapsed model were built to analyze resisting collapsed ability of two structures. The results show that the torsion effect of plane irregular serial isolation structure subjected to near-fault seismic motion relative to that of the non-isolated structure obviously decreases. Meanwhile, the collapse simulation show that plane irregular non-isolated structure is easier to collapse than plane irregular serial isolation structure.%串联隔震结构目前在国内外都比较常见,其安全性也得到了广泛的关注.而且串联隔震结构的自振周期较长,所以近断层地震动对串联隔震结构的抗震性能有不利的影响.本文分析了平面不规则串联隔震结构在近断层地震作用下的抗震性能,并对其进行了倒塌过程模拟.运用MSC.MARC建立平面不规则串联隔震结构和非隔震结构模型,选择不同的地震动输入进行非线性仿真分析.通过比较近断层地震作用下平面不规则串联隔震结构与非隔震结构的动力响应,并总结其规律；对隔震与非隔震结构建立倒塌模型,分析两种结构的抗倒塌能力.研究表明:近断层地震作用下平面不规则串联隔震结构的扭转效应相对于非隔震结构的扭转效应明显减小.同时,倒塌模拟表明,平面不规则的非隔震结构较串联隔震结构容易倒塌.