适用纯摩擦基础隔震结构的新型限位装置研究

Research on New Limiting Device for Pure Friction Base-Isolated Structure

为了克服纯摩擦基础滑移隔震结构缺乏限位能力的不足,将橡胶与铅芯合理组合形成一种新型的限位装置。利用Matlab/Simulink建立新型限位装置的仿真模型,通过数值模拟,确定带限位装置的隔震体系在"先滑后限"状态下的自滑区长度,分析限位橡胶弹性刚度、刚度比及隔震层摩擦系数对结构动力响应的影响。新型限位装置具有较好的隔震限位性能。限位橡胶的屈服前刚度、刚度比越大,结构基底最大剪力也越大,隔震层最大滑移越小。新型橡胶限位装置能为后续起草的建筑摩擦隔震技术规程的被动控制措施提供重要参考。

To overcome the lack of limiting capacity of the pure base-isolated structure structure, a new type of limiting device is formed by combining rubber with lead core. The limit device model is established by Matlab/Simulink, the length of the sliding zone of the isolation system with the limiting device is determined under the condition of "first sliding and then limited", and the influence of the elastic stiffness and stiffness ratio of the limiting rubber and the friction coefficient of the isolation layer on the dynamic response is analyzed. The new limiting device has good seismic isolation performance. With the greater the stiffness and the stiffness ratio of the limiting rubber, the maximum shear of the structure is greater, and the maximum slip of the isolation layer is smaller. The new rubber limiting device can provide an important reference for the subsequent passive control measures of the architectural friction isolation technical regulations.