多点输入下大跨空间网格结构地震响应分析

Seismic response analysis of long-span space lattice structure under multiple-support excitation

分析了多点输入下的结构计算模型和方法,以某大跨空间网格结构为例,对其进行多点输入下的地震响应分析,并与单点输入下的动力时程计算结果进行对比,给出了不同视波速对大跨空间网格结构表面应力分布的影响.通过多点输入与单点输入结构上的差异、视波速对这种差异的影响及节点位移时程的差异,归纳出多点输入下结构的反应特点,提炼出行波效应对结构的影响规律,总结出结构的跨度对多点输入的影响.

Calculation models and methods under multiple-support excitation are analyzed.Taking the long-span space lattice structure as an example,the seismic response analysis under multiple-support excitation is carried out and the results are compared with those obtained under single excitation.The influence of surface stress under different apparent wave velocity and displancement of nodes on the difference of structure response under the multiple-support excitation and single support excitation is investigated and important results are obtained.