大跨度钢屋盖轮辐式索桁架结构施工方法与数值模拟

Construction Technology and Numerical Simulation of Wheel-spoke Cable Truss Structure for Large-span Steel Roof

轮辐式张拉结构通过张拉柔性拉索形成刚度,抵抗结构所承受的外荷载。为保证柔性结构张拉成型全过程安全可靠、张拉完成后满足设计要求,对施工过程各阶段进行数值模拟和计算分析,确定合理的施工方案。采用有限元软件ANSYS建立济南市黄河体育中心钢屋盖轮辐式索桁架整体分析模型;通过等效降温法对轮辐式拉索施加预拉力,得到不同施工阶段整体结构力学响应;对索桁架结构展开形态分析,使索构件实际内力与设计拉力吻合。研究表明,采用等效降温法可实现对大跨度钢屋盖轮辐式拉索预拉力的模拟,整体结构在各施工阶段的力学响应满足安全性要求。

The wheel-spoke tension structure resists the external load after the stiffness forms by tensioning the flexible cable.In order to ensure the safety and reliability of the whole process of flexible structure tension forming and meet the design requirements after tension,it is necessary to carry out numerical simulation and calculation analysis of each stage for the construction process to determine a reasonable construction scheme.The finite element software ANSYS was used to establish the overall analysis model of steel roof wheel-spoke cable truss of Jinan Yellow River Sports Center.The equivalent cooling method was used to apply pre-tension to the wheel-spoke cable,and the mechanical response of the overall structure in different construction stages was obtained.The shape analysis of the cable truss structure was carried out to make the actual internal force of the cable member consistent with the design tension.The research shows that the equivalent cooling method can be used to simulate the pre-tension of the largespan steel roof wheel-spoke cable,and the mechanical response of the whole structure in each construction stage meets the safety requirements.