大位移桥梁伸缩缝耦合动力学研究

摘要

Coupling (vertical and horizontal)dynamics of the large displacement bridge expansion joints were researched by using finite element analysis software.The research results show that:the mu-tual influence between vertical and horizontal vibration displacement of center beam is small,therefore, vertical and horizontal vibration response of the expansion joints can be researched separately;when double vehicles simultaneously through the expansion joints in the same direction or reverse,maximum vertical vibration displacement of center beam has little difference with a single vehicle through the ex-pansion joints,and position of maximum vertical vibration displacement of center beam is the same;when vehicle velocity is 120 km/h,horizontal vibration displacement of double vehicles simultaneously through the expansion joints in the same direction or reverse is more 44.4% or less 42.0% than a single vehicle through the expansion joints.%运用有限元分析软件对大位移桥梁伸缩缝进行耦合（竖向和水平）动力学研究。研究结果表明：中梁竖向振动位移与水平向振动位移之间的相互影响很小，故可对伸缩缝竖向或水平向振动响应单独进行研究；双车辆同时同向或反向通过伸缩缝时，中梁最大竖向振动位移与单车辆通过伸缩缝时相差不大，并且中梁出现最大竖向振动位移的位置相同；当车速为120 km/h时，双车辆同时同向或反向通过伸缩缝时的水平振动位移比单车辆通过伸缩缝时大44．4％或小42．0％。