大跨度结构抗震分析方法及近期进展

对反应谱方法、随机振动方法和时间历程法应用于大跨度结构 抗震分析时的特点作了分析和对比。研究表明，地震地面运动的空间 变化效应(特别是行波效应)对大跨度结构的响应有相当大的影响。反 应谱方法对多点激励地震分析显得相当困难，而随机振动方法则有明 显的优越性。对于强震作用下的大跨度结构非线性地震响应，时间历 程法在现阶段仍应是主要的分析方法。

SEISMIC ANALYSIS METHODS OF LONG-SPAN STRUCTURES AND RECENT ADVANCES

For the seismic response analysis of long-span structures, the characteristics of the response spectrum method, the random vibration method and the time history method are com- pared in this paper. It is found that the spatially varying effects of the ground motions, especially the wave passage effect, have great influences on the dynamic responses of long-span structures. For seismic analysis of multi - degrees-of-freedom 3 multiply support ed structures subjected to spa-tially varying ground motions, the response spectrum method is difficult to implement, while the random vibration method has great advantages. For nonlinear seismic analysis of long-span struc-tures under very strong ground motions, the time history method is still the preferred approach nowadays.