连梁拉索的防落梁效果研究

Research of Cable-Unseating Prevention Device

摘要: 桥梁上部结构发生落梁是导致桥梁结构发生倒塌的重要原因之一。防落梁措施的主要功能就是防止上部结构在地震过程中发生落梁。本文选取某连续桥梁作为分析对象，通过增加梁体搁置长度和设置连梁拉索装置的方法，结合大型有限元软件ABAQUS进行模拟分析，研究防落梁措施的效果。从分析结果可知，仅增加梁体搁置长度或局部设置连梁拉索并不一定能防止落梁，需要从桥梁结构整体防落角度来设置防落梁措施。

Abstract: The upper structure falling is one of the important reasons that cause the bridge collapsed. Beam lowering prevention measure’s main function is to prevent the upper structure falling in a earthquake. This article takes a multi-scale bridge as the analysis object, using the large finite element software ABAQUS simulation to analyze it. This paper studies the effects of beam lowering prevention measure, by the way of increasing the suspended length of the girder and setting the cable-unseating prevention device. Through the analysis results, we can find out that only increase the suspended length of the girder and set the cable-unseating prevention device locality is not necessarily useful. The bridge structure should be viewed as a whole to set the beam lowering prevention measures.