大跨空间网壳结构设计中反应谱法和时程分析法的探讨

Discussion on Response Spectrum Method and Time History Analysis for Long Span Reticulate Shell Structural Design

反应谱理论对于解决大跨度、现代大型复杂结构的抗震设计存在较大的误差。应用振型分解反应谱法和时程分析法对大跨空间网壳结构的地震响应进行了分析和比较,讨论了矢跨比、跨度等对其的影响。分析发现,对于大跨空间网壳结构,有一定数量的"反应谱方法计算安全而时程分析危险"的杆件,设计中应注意。

The response spectrum method indicates the ground seismic property and the structural response characteristic simply and clearly. The dynamics problem can be translated into the statics problem by the response spectrum method in the aseismatie analysis. But it will cause large errors for design of long span space and the complicated structures. The seismic responses are compared and analyzed by the response spectrum method and the time history method for the long span reticulate shells, in which the effects of the ratio vector and span are discussed. Some important conclusions are obtained through numerical examples, which can present the theoretical foundation for aseismatic design of long span space reticulate shells.