中央索面混凝土斜拉桥单箱五室超宽主梁的局部应力分析

摘要

西江大桥为主跨320 m的双塔中央索面预应力混凝土斜拉桥,桥塔位于主梁的中间,主梁采用大悬臂单箱五室预应力混凝土主梁,该桥在结构特征和受力特点上具有一定的新颖性和复杂性.文中建立了塔梁处的主梁的三维有限元模型,重点分析在主梁根部最大轴力作用下,塔梁相交处的主梁、斜拉索的第一个锚块、边/中纵隔板的局部应力分布特征.%Xijiang bridge is a cable-stayed bridge with central cable-plane and wide box girder. Its pylon is located in the central of the main girder with long cantilever and five-room single box. Based on the three-dimensional finite element model of segmental girder located at the joint of pylon and girder, local stress distribution of girder is analyzed under the largest axial force at the root of main girder, with emphasis on the first anchor block of cable and side/central mediastinal board.