基于反应谱法的桥梁抗震分析

Seismic Analysis of Bridges Based on Response Spectrum Method

为了研究桥梁抗震设计原理及计算方法,文章选取广州市某抗震设防烈度为7度的地区中的斜交简支梁桥为分析对象,借助Midas Civil与Midas Civil Designer应用软件,基于反应谱法进行抗震分析,对桥墩强度、支座厚度、支座抗滑稳定性进行验算,并对桥墩进行能力保护设计方面的分析。分析结果表明,桥墩在E2地震作用下仍处于弹性阶段,满足抗震需求,且无须进行能力保护设计;支座拥有足够的变形能力和稳定性,满足抗震需求。文章分析过程可为类似工程提供参考。

In order to study the seismic design principles and calculation method of the bridges,this paper selects a skew simply supported beam bridge in an area with seismic fortification intensity of 7 degrees in Guangzhou as the analysis object.With the help of Midas Civil and Midas Civil Designer application software,the seismic analysis is carried out based on response spectrum method.The strength of the pier,the thickness and the anti-sliding stability of the support are checked,and the capacity protection design of the bridge pier is analyzed.The analysis results show that the bridge pier is still in the elastic stage under the action of E2 earthquake,which meets the seismic demand and does not need to carry out capacity protection design.The support has sufficient deformation capacity and stability to meet the seismic demand.The analysis process of this paper can provide reference for similar engineering.