连续梁桥纵桥向防落梁装置结构模式的研究

Research on the Mode of Longitudinal Unseating Prevention System for Continuous-Beam Bridge

摘要:

为防止连续梁桥上部结构在地震中发生落梁破坏, 通常在伸缩缝处安装防落梁装置。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限位效果。而国外对防落梁装置的研究多针对简支梁桥和T构桥。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。本文对连续梁桥防落梁装置的两种结构模式进行了研究，分析表明：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:

Seismic unseating prevention mearsures are often needed at expansion joints of bridges to prevent the superstructures from falling off during earthquakes. Domestic unseating prevention system without design is done by construction measures, so it can’t ascertain the effect of unseating prevention system. Overseas researching focused on simple-supported beam and ‘T’ frame with intermediary hinge. To mode of unseat-prevention, connection device between girders is applied by Japan,however, bridges in America usually adopts the restrainers between girder and pier. In this paper, two modes of unseating prevention system for the continuous-girder bridges is studied and result is: it is rational to mode of restrainers between girder and pier for the continuous-girder bridges.