膜型网壳结构抗震性能研究

Research on seismic performance of membranous latticed shell

本文采用子空间迭代法分析了单层膜型网壳结构的自振特性;推导了大跨空间结构几何非线性地震响应时程分析的计算过程,编制相应的计算程序,用振型分解反应谱法与时程法进行了结构地震响应特性分析。研究表明:膜型网壳结构的抗震性能比较好;用反应谱法分析时,水平地震作用下截断振型取15、竖向地震作用下取60可满足工程设计要求;用反应谱法计算结构竖向地震响应是安全可靠的,但进行水平地震响应分析时,最终还需用时程法进行验算。

The basic natural vibration property of single layer membranous latticed shell was analyzed by using subspace iteration method. The formula for earthquake response of long span spatial structure considering geometrical non-linear factor was deduced, and the corresponding computer program was developed. The seismic performance of membranous latticed shell was researched by using both response spectrum theory and response time history method. The research shows that： the seismic performance of membranous latticed shell is good;the reasonable number of vibration modes is 15 ,when analyzing the seismic performance of this structure under vertical earthquake ground motion by using response spectrum theory, but that is 60 under horizontal earthquake ground motion; the calculating results of the seismic performance of this structure under vertical earthquake ground motion by using response spectrum theory is on the safe side, but when analyzing the seismic performance of the structure under horizontal earthquake ground motion, the results should be checked by response time history method.