连续梁桥纵桥向防落梁装置结构模式对比研究

Comparative Research on Modes of Longitudinal Unseating Prevention System for Continuous Bridge

摘要:

目前国内所采用的防落梁装置一般是作为构造措施,没有经过计算和设计,在地震作用下很难起到真正的防落梁效果.对于防落梁装置的结构模式,日本经常采用直接连接梁体的连梁装置,而美国则采用墩梁连接的限位装置.通过非线性时程方法对连续梁桥防落梁装置的两种结构模式进行了对比研究,分析了两联连续梁桥不同周期比和碰撞对连续梁桥防落梁装置结构模式的影响,结果表明：连续梁桥应采用墩梁连接的限位装置模式来设计防落梁装置.

Abstract:

Domestic unseating prevention system without design is done as construction measures,which,therefore,can’t ascertain the effect of unseating prevention system.As for the mode of unseatprevention,connection device between girders is applied in Japan,however,bridges in America usually adopts the restrainers between girder and pier.Two modes of unseating prevention system for the continuousgirder bridges is compared by nonlinear timehistory method.Different period ratio and collision of two continousbeam bridge is considered to the modes of unseating prevention system.Results show:it is rational to mode of restrainers between girder and pier for the continuous bridges.