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地震作用下大跨斜拉桥梁端会发生很大位移,过大位移可能会导致主梁与引桥发生碰撞。针对地震作用下大跨斜拉桥伸缩缝处的碰撞现象,以一座大跨斜拉桥工程设计为例,采用非线性时程法研究了纵向地震作用下大跨斜拉桥主引桥碰撞效应对结构地震反应的影响规律。研究结果表明:碰撞效应不仅会产生很大的撞击力,而且可能使引桥地震力需求、引桥梁端位移、主引桥相对位移及引桥梁体搭接长度需求有较大增长,极易造成引桥的落梁或者破坏;但碰撞效应对主桥的地震需求影响较小。
Due to the earthquake, great displacement will occur at the beam end of long-span cable-stayed bridge. Excessive displacement may cause the main girder and the approach bridge to collide with each other. In view of the collision phenomenon at the expansion joint of long-span cable-stayed bridge under earthquake, taking a long-span cable-stayed bridge as an example, the nonlinear effect of longitudinal earthquake on the main-bridge collision effect of long-span cable- Influence law of earthquake response to structure. The results show that the collision effect not only produces a great impact force, but also may cause the demand for the seismic force of the approach bridge, the displacement of the approach bridge end, the relative displacement of the main approach bridge and the length of the bridge body to be bridged, Falling or destroying the beam; however, the impact of the collision has little effect on the seismic demand of the main bridge.