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针对地震作用下多联长桥结构中伸缩缝处的碰撞破坏,用接触单元模拟桥墩两联间伸缩缝和桥台处伸缩缝在地震作用下的碰撞效应,建立了4个包含墩柱、主梁、支座和伸缩缝的曲线和直线全桥空间分析模型,分别输入2组地震波的8种地震动工况,进行非线性时程计算,研究桥台伸缩缝的设置与否对多联桥跨结构地震碰撞响应的影响,提出取消桥台伸缩缝的设置可有效消除或减小多联桥跨结构中伸缩缝处的地震碰撞破坏。
Aiming at the collision damage of expansion joint at the multi-long bridge structure under the action of earthquake, the collision effect of the expansion joint between the two joints of bridge pier and the expansion joints at bridge abutment under earthquake action was simulated by contact unit. Beam, support and expansion joint curve and straight line full-bridge space analysis model, respectively, the input of two groups of 8 kinds of seismic wave ground motion conditions, non-linear time-course calculation, research abutment expansion joints set or not to multi-joint bridge The impact of cross-structural earthquake impact response is proposed. It is proposed that the elimination of the abutment expansion joint can effectively eliminate or reduce the earthquake collision damage at the expansion joints in the multi-span bridge.