近断层地震作用下平面不规则基础隔震结构的倒塌模拟  

Collapse Simulation of Plane Irregular Base-isolated Structures Subjected to Near-fault Seismic Motion

作　　者：杜永峰[1,2] 朱翔[2] 王小虎[2] 

机构地区：[1]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050 [2]兰州理工大学防震减灾研究所,甘肃兰州730050

出　　处：《工程抗震与加固改造》2012年第5期68-73,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(50978130;51178211)

摘　　要：分析了平面不规则基础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。基础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。由于基础隔震结构的自振周期较长,所以近断层地震动对基础隔震结构的抗震性能有不利的影响。通过建立倒塌分析动力方程,使非线性仿真分析的解答精度得以保证,以此建立平面不规则基础隔震结构和非隔震结构模型,选择不同的近断层地震动作为输入进行非线性仿真分析。研究表明:近断层地震作用下平面不规则基础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基础隔震结构容易倒塌。In this paper, the seismic performance of plane irregular base-isolated structures subjected to near-fault seismic motion is analyzed. And the collapse simulation of plane irregular base-isolated structures subjected to near-fault seismic motion is also analyzed. These kinds of base-isolated structures are now more common at home and abroad. Its safety has also been widespread concern. As the natural period of the base-isolated structures is long, so the near-fault seismic motion have an adverse effect on the seismic performance of base-isolated structures. The simulation analysis of nonlinear solution accuracy can be guaranteed through the establishment of collapse analysis of dynamic equation. Plane irregular base-isolated structure model and non-isolated structure model are established based on the dynamic equation, and the different near-fault seismic motions are chose as input analyze non-linear simulation of these two structures. The results show that plane irregular base-isolated structure＇ s torsion effect subjected to near-fauh seismic motion relative to the non-isolated structure＇ s torsion effect obvious decrease. Meanwhile, the collapse simulation shows that plane irregular non-isolated structure is easier to collapse than plane irregular base-isolated structure.

关 键 词：近断层 基础隔震结构 平面不规则 扭转 倒塌模拟 

分 类 号：TU352.12[建筑科学—结构工程]