索穹顶结构两种施工成形方法的模拟与分析

摘要

结合国内外已有的索穹顶结构施工张拉成形方法及相关研究成果,以一跨度为100m的索穹顶结构为例,提出了两种结构施工成形方法:中心设置固定塔架仅张拉外圈斜索成形法、中心设置提升塔架索杆原长累计安装成形法,并采用动力松弛法对两种施工成形方法进行了施工成形全过程模拟与分析,重点分析了固定塔架标高与提升高度对结构成形过程中构件内力与位形的影响,为实际工程的张拉施工提供理论依据和技术支持.%In this paper construction analysis of a cable dome with a diameter of 100m was conducted.Two kinds of construction scheme such as only tensioning the outer diagonal cable with center set fixed tower and installing the cables with the original length from outer to inner with center set lifted tower were provided.Construction process was simulated based on the dynamic relaxation method.Forming process of members with the emphasis on the influence of the fixed tower level and hoisting height on the internal force and configuration of the structure was studied.The results of research indicate that the designed form of the cable dome can be obtained successfully according to the proposed construction schemes.