空间非对称框架结构偏心扭转地震反应的控制

The study on controlling eccentric torsional seismic response of the 3D asymmetric frame structure

首先根据空间非对称框架结构的特点以及实施扭转振动控制的要求 ,采用当前发展较为成熟的 RB(叠层橡胶支座 )和 LRB(叠层铅芯橡胶支座 )作为调控隔震元件 ,建立了一种空间杆系—层间计算模型。作者开发了多维地震动输入下的三维线性、非线性动力时程分析程序 ,对一典型多层非对称框架结构采用传统非隔震和基础隔震方案 ,水平输入地震波 ,进行了一系列的平动—扭转耦联地震反应对比分析 .结果表明 ,通过设置隔震支座 。

In terms of the character of spatial asymmetric RC frame structure and the requirement of controlling torsion vibration, firstly a 3D member-story model is established with taking Rubber Bearing(RB) and Lead Rubber Bearing(LRB) as isolators. Based on the model, the authors develop a 3D linear and nonlinear dynamic time-history analysis program of frame structure under the multi-dimension ground motions. One typical multistory asymmetric RC frame structure subject to horizontal earthquake waves serves studying of the object, adoption of conventional fixed-base and RB or LRB base-isolated methods respectively. Then, a series of translation-torsion coupling seismic responses are analyzed comparatively. Finally, the calculated results show, that through making use of the base-isolated technique, the eccentric torsion effect of multistory asymmetric frame structure can be controlled effectively.