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针对曲线匝道桥梁的伸缩缝地震碰撞破坏现象,依托一座多层互通式立交体系中的单支带伸缩缝曲线匝道桥工程,用Kelvin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。文章建立了包含墩柱、主梁、支座和伸缩缝的全桥空间动力模型,利用非线性时程分析法,针对2个计算模型,分别输入多种地震动工况,对比分析曲线匝道桥梁桥墩处伸缩缝和桥台处伸缩缝的地震碰撞响应差异,结果表明:取消桥台伸缩缝更利于曲线匝道桥跨结构抗震的概念。
Aiming at the phenomenon of the earthquake collision and collapse of the expansion joints of curved ramp bridges, based on a single ramp tunnel bridge project with a telescopic joint in a multi-layer interchange system, the Kelvin contact elements are used to simulate the expansion joints between the bridge piers and the expansion joints Earthquake effect under the collision. In this paper, a full-bridge space dynamic model including piers, main girders, supports and expansion joints is established. By using the nonlinear time history analysis method, a variety of ground motion conditions are input to two calculation models respectively, The results show that the elimination of bridge abutment expansion joints is more advantageous to the seismic resistance of curve ramp bridges.