【摘要】 针对地震作用下多联长桥结构中伸缩缝处的碰撞破坏,提出一种取消桥台伸缩缝保留两联间桥墩伸缩缝的新型多联桥跨结构。用Kelvin接触单元模拟桥台伸缩缝和桥墩两联间伸缩缝在地震作用下的碰撞效应,构建包括墩柱、主梁、支座和伸缩缝在内的全桥空间动力分析模型。依托某市立交体系中一座独立多联长曲线匝道桥梁工程,建立4个计算模型;分别输入2组地震波的单维和多维8种地震动工况;利用非线性时程分析法,研究各计算模型在多种地震输入工况下桥台伸缩缝和桥墩两联间伸缩缝的碰撞响应差异。结果表明:无桥台伸缩缝多联桥跨结构可以有效消除或减小地震荷载作用下桥跨结构中伸缩缝处的碰撞破坏,是一种十分有利的抗震结构形式。更多还原

【Abstract】 Aiming at pounding damage at expansion joint in a multi-unit(where one continuous girder is defined as one unit) long bridge under earthquake,a new multi-unit bridge structure without abutment expansion joint was proposed.With the Kelvin contact element simulating the pounding response of expansion joints,space dynamic model of the full-bridge was constructed,including pier,beam,bearing and expansion joint.Based on a single multi-unit curved ramp bridge in the interchange in practice,four full-bridge models were built.Using nonlinear time history analysis method,seismic responses were obtained from eight types of earthquake input condition.The pounding responses of expansion joints on pier table and abutment table were compared and analyzed for different models.The result indicates this new type bridge—a multi-unit structure without abutment expansion joint can eliminate or mitigate pounding damage at expansion joint and is a favorable bridge structure for seismic.更多还原