基于梁格法的变宽板桥分析

当桥梁桥位受限于线路布置时,难免出现一些变宽、弯坡斜等构造不规则的结构,目前已有的理论和计算方法存在一定的局限性.文中建议采用正交各向异性薄板及梁格分析法,以某变宽板梁桥为例对其进行分析,发现应重点控制支座处的内力及配筋设计,以及悬臂板的横向正弯矩和负支座反力.

Analysis of Widened Slab Bridge Based on Ggrillage Method

When the bridge location is limited by the layout of the line,it is inevitable to result in some irregular bridge structures with widening bridge deck or inclination slope,and so on.The existing theory and calculation method have some limitations,so the orthotropic thin plate and its grillage analysis method should be adopted.The widening plate girder bridge on the main line of Zhenjiang straight line interchange of Shanghai-Nanjing Expressway,which is located at an improved alignment section of Zhengjiang city in G312,is analyzed as an example.It is concluded that the internal force and reinforcement design at the support should be handled carefully,and the lateral positive bending moment and negative bearing reaction force of cantilever plate should be paid attention to.