基础隔震结构地震能量分布及耗散研究

Research on Seismic Energy Distribution and Dissipation of Base-isolated Structure

为了研究隔震结构在不同特性地震动作用下能量的分配与耗散机制,基于能量平衡原理,利用抗震非线性软件perform3D,对近场和远场地震动作用下隔震结构和非隔震结构地震响应进行了对比分析,得到了隔震结构和非隔震结构在多遇、设防及罕遇地震下地震能量的输入、分布及耗散规律。研究表明:近场地震动作用对隔震结构耗能形式影响较大,且其对两种结构产生的滞回耗能比例更大;滞回耗能沿结构竖向呈现上小下大的分布规律;结构构件刚度变化对构件滞回耗能影响较大。

In order to investigate the mechanism of seismic energy distribution and dissipation of base-isolated structure under different characteristics of earthquake ground motion,the analysis of seismic response for the base-isolated structure and non-isolated structure under the near-field and far-field earthquake action are made by using software perform3 D based on the principle of energy balance.The rule of earthquake input energy and its dissipation are obtained for base-isolated structure and non-isolated structure under frequent earthquake,seismic defense and rare earthquake. The results show that the near-field earthquake has a great influence on the form of energy dissipation for base-isolated structure,and the hysteretic energy dissipation proportions of the two structures are larger; The hysteretic energy dissipation along the vertical of the structure presents a rule that is small top and big bottom; the stiffness of the structure has a great influence on the hysteretic energy dissipation.