大跨度双塔斜拉桥地震响应分析方法研究

Study on analysis methods for seismic response of long span cable-stayed bridge with twin towers

以某主跨为416 m的双塔斜拉桥为工程背景,选取2条人工波和2条天然波,分别采用反应谱法、时程分析法和功率谱法进行地震响应分析.分析结果表明:在人工地震波作用下,三种方法计算得到的主梁和主塔地震响应基本一致;在天然地震波作用下,主梁和主塔的反应谱分析结果介于其它两种方法之间.对斜拉索而言,时程分析结果与其它两种方法计算结果有较大差别.因此,可选择反应谱法对主梁和主塔进行地震响应分析;选择时程分析法对斜拉索进行地震响应分析.

In this paper,a practical project is taken as research background which is double pylon cable-stayed bridge with main span of 416 m.Two artificial seismic waves and two seismic records were selected to analyze the seismic behaviors by the response spectrum method,time history analysis method and power spectrum method.The result shows that seismic responses of the girder and main tower are basically identical under the effect of artificial seismic wave.The response spectrum analysis results of them are between the other two methods under the effect of the natural seismic wave.For stay cable,time history analysis results has great difference compared with other two methods’ results.Therefore,researchers can choose response spectrum method to analyze seismic response of girder and tower,and time history analysis method for stay-cables.