基础隔震结构的耗能分析

Energy dissipation analysis of base isolated structures

采用Bouc-Wen模型,利用状态空间迭代法,对基础隔震结构进行了多质点的弹塑性时程分析, 并根据此结果,利用能量方程,求得隔震结构的各项能量,绘制了各能量项时程曲线。以一实际工程为例,求得隔震结构的各项耗能情况,说明了基础隔震结构以减少地震输入和隔震层滞回耗能来减小对上部结构的损坏。

This paper concerns seismic energy of base isolation. The Bouc-Wen model is adopted in order to take into account the non-linear behaviour of base isolated structure, and the dynamic time history analysis of the base isolated structure is carried out by state space iteration method. After non-linear seismic response of the system is estimated, each energy component of the base isolated structure is obtained by using energy equation, and time history curve of each energy component is given. An actual isolated building is chosen as numerical example,the each energy component of this isolated building is calculated, the result shows that the base isolated structure can protect against earthqukes by reducing seismic input energy and increasing hysteretic energy of isolator.