自锚式悬索桥钢塔塔吊附墙设计与局部受力分析

Design of Tower Crane Supporting Wall and Local Stress Analysis of Steel Tower of Self-anchored Suspension Bridge

济南凤凰路黄河大桥为70m+168m+428m+428m+168m+70m的三塔自锚式空间缆悬索桥,主塔结构设计为A形塔,包括2个边塔和1个中塔。中塔高126m,塔柱结构形式分为结合段与钢结构段,结合段采用钢混组合结构,受拉区拉应力由钢束承担。中塔采用2 800t·m塔吊吊装施工,塔吊基础预埋至中塔承台;边塔安装250t·m塔吊用以辅助吊装作业,边塔塔吊基础牛腿与钢塔焊接;塔吊与主塔均设置2道附墙。采用MIDAS FEA软件建立钢塔板单元有限元模型,对附墙杆件及钢塔局部受力进行分析。结果表明,各部位受力均满足规范要求。

The Fenghuang Road Yellow River Bridge is a three-tower self-anchored cable suspension bridge,70+168+428+428+168+168+70 min span layout.The main tower structure is designed as an A-type tower,including two side towers and a 126 m high middle tower.The tower pillar structure is divided into a joint section and a steel structure section.The joint section adopts a steel-concrete composite structure,and the tensile stress in the tensile zone is borne by the steel bundle.The central tower of the bridge is constructed by 2800 t.m tower crane.The foundation of the tower crane is embedded in the middle tower cap.The 250 t.m tower crane is installed on the side tower to assist the lifting operation.There are two supporting walls.The MIDAS FEA software is used to establish the finite element model of the steel tower plate element to analyze the supporting walls and the local stresses of the steel tower.The results show that the stress of each part meets the requirements of the specification.