地震作用下,引桥与斜拉桥一旦发生碰撞,会增大斜拉桥的损伤风险。为了研究结构碰撞效应下大跨径斜拉桥主桥和引桥的地震响应问题,以1座典型半漂浮大跨径斜拉桥为例,采用 Midas Civil大型有限元分析程序建立结构动力计算模型,基于动力时程分析法进行分析。结果 表明:考虑单边碰撞时,主引桥基本周期接近时,碰撞力较小,单边碰撞会减小主桥梁端位移,增大引桥梁端和主塔塔顶位移,且单边碰撞效应大于双边碰撞,单边碰撞更大地影响与其相连的引桥。
The pounding damage at expansion joints of cable-stayed bridge during earthquakes would increase the risk of cable-stayed bridge. In order to study the pounding effects of adjacent girders at expansion joints on seismic responses of main bridge and approach bridges,this research was focused on a cable-stayed bridge. Midas civil was adopted to establish structural dynamic calculation model. Combining with dynamic time history analysis method,this research shows that considering the one sided pounding,the basic cycle of the main bridge and the bridge is close,the collision force is small,the displacement of the main bridge will reduce and the displacement of the bridge beam and the main tower increase when considering the one sided pounding,and the one sided pounding's effect is greater than the two sided pounding. The one sided pounding has a greater impact on the bridge connected to it.
