大跨空间网壳结构竖向多点输入地震响应分析

Vertical Seismic Response Analysis of Long-span Spherical Shell Structure

为了考虑大跨结构的地震响应随地震动空间变化的特性，研究了多点输入下大跨结构的运动方程，运用虚拟激励法的原理对多点输入下的大跨网壳结构的地震响应进行分析，在ANSYS通用软件中将多点输入考虑为静力计算和谐响应计算。通过对平面直径为80m的单层球面网壳结构的算例分析，得到了竖向多点输入下计算模型结构节点位移响应和杆件内力响应，并和竖向一致输入的计算结果做了统计分析，得出了竖向多点输入下结构节点位移响应和杆件内力响应的变化规律。结果表明，考虑了行波效应的多点输入，计算模型结构节点位移响应和杆件内力响应较一致输入复杂，充分考虑大跨结构的多点输入是十分必要的。

In order to consider the vibration characteristics of spatial variation everywhere of long-span struc- ture seismic response, the equation of motion for the multi-point input of long-span structure is studied, the seismic response of the long-span structures is analyzed by the principles of pseudo-excitation method. In general software ANSYS, multi-point input is considered with static calculations and harmonious response calculations. As the ex- ample analysis, the 80m single-layer reticulated spherical shell structure is analyzed, the vertical seismic response of the long-span spherical shell structure is obtained, statistical analysis of multi-point input and uniform earthquake are compared. Results proves that considering the traveling wave effect, the node displacement of long-span spheri- cal shell structure and internal force is more complex, so it is very necessary to fully consider multi-point input mo- tion.