连续刚构拱桥拱梁墩结合处力学特性研究

Research on Mechanical Characteristics of Arch Beam Pier Joint of Continuous Rigid Frame Arch Bridge

拱梁墩结合处是连续刚构拱桥的薄弱部位,以某(90+180+90)m连续刚构拱桥为背景,通过有限元软件采用先整体后局部的分析方法计算拱梁墩结合处在恒载和恒载+活载两种工况下的受力和变形情况。研究表明:在成桥阶段活载对结合处应力增加影响较小,该桥拱座与拱肋接触部位较为薄弱,可参考在拱肋底端加装应力扩散板。

The joint of arch-beam-pier is the weak part of continuous rigid frame arch bridge.Taking a(90+180+90)m continuous rigid frame arch bridge as the background and using the finite element software,the stress and deformation of the joint of arch-beam-pier under dead load and dead load +live load were calculated by the method of global analysis and then local analysis.The results show that live load exerts little effect on the stress increase of the joint of arch-beam-pier,and the stress between the arch seat and the arch rib of the bridge exceeds the limit.A stress diffuser plate may be considered at the bottom of the arch rib to reduce the stress.