不同方法对某桥梁抗震分析的影响比较

A Comparison Between Impact of Different Approach on Bridge Seismic Analysis

反应谱法和时程分析法是桥梁结构抗震计算中的两种基本方法。为了比较这两种方法对计算结果的差异,对某主桥结构进行了动力特性分析,应用反应谱法和时程法分别对主桥结构进行了P1和P2两阶段的地震响应分析和相应的强度验算,两种方法得出了不同的结论。由于反应谱法分析是基于线性系统的,而时程法作为精细的分析方法,适用于任何非线性系统,因此在两种方法结论有较大差异时,应以时程法结果作为最终的设计依据。

Response spectrum and time history analysis method are two basic ways in the bridge structure calculation. In order to compare the difference between the results of the two calculating methods, the dynamic properties of a main bridge structure are analyzed in this paper. The analysis of the response to the earthquake and corresponding intensity checking by the method of response spectrum and time history analysis on the main bridge structure in the P1 and P2 stage are carried out. Different conclusions are made by the two ways. As the response spectrum analysis is based on the linear system, and the time history method of analysis as a fine analysis can be applied to any non-linear system, so when a large difference by the two ways occurs the results of time-seismic should be taken for the ultimate design basis.