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.