Nonlinear Response of Torsionally Coupled Base Isolated Structure
Nonlinear Response of Torsionally Coupled Base Isolated Structure
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DOI：
10.1061/(asce)0733-9445(1994)120:1(1
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发表时间：
1994
期刊：
影响因子：
--
通讯作者：
R. S. Jangid;T. Datta
中科院分区：
文献类型：
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作者：
R. S. Jangid;T. Datta
采用数值模拟的方法，得到了不同参数变化下扭转耦合基础隔震体系在随机地震作用下的非线性响应。参数包括表征上部结构的质量、刚度和阻尼特性的参数（即，固定基座扭转耦合系统）和基座隔振器。将模拟分析的平均峰值响应与：（1）相应的固定基础系统进行比较，以研究基础隔震的有效性;和（2）相应的对称系统，以突出扭转耦合的影响。隔震器由一系列位于基础和刚性底板之间的弹性支座组成。隔振器对水平运动的双向滞回恢复力由一组耦合的非线性微分方程来模拟。参数研究的结果有助于理解扭转耦合隔震结构的性能和有效的设计。
Nonlinear response of torsionally coupled base isolated system to random ground motion is obtained under different parametric variations using a simulation procedure. Parameters include those which characterize mass, stiffness, and damping properties of the superstructure (i.e., fixed base torsionally coupled system) and the base isolator. The mean peak responses from simulation analysis are compared to: (1) Corresponding fixed base system to investigate the effectiveness of base isolation; and (2) corresponding symmetric system to highlight the effect of torsional coupling. The isolator consists of an array of elastomeric bearings between the foundation and the rigid base slab. The bidirectional hysteretic restoring force provided by the isolator against horizontal movement is modeled by a set of coupled nonlinear differential equations. The results of the parametric study help in understanding the behavior and effective design of torsionally coupled bae isolated structures.