【摘要】 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。更多还原

【Abstract】 Aimed at pounding damage of expansion joint in a curved ramp bridge under earthquake,relying on a multilevel junction system project,the pounding between expansion joints at pier table and abutment table under earthquake was simulated by using Kelvin contact element.The space dynamic model of a single curved ramp bridge including piers,beams,bearings and expansion joints was built.By using nonlinear time history analysis method,different pounding responses between expansion joints at pier table and abutment table of a curved ramp bridge in two computation models under different seismic conditions was compared.The result indicates that the curved ramp bridge without abutment expansion joints is more favorable for seismic resistance.更多还原