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索穹顶结构在张拉过程中一般采用分批分级张拉斜索的方式.由于索穹顶结构的环索通常采用连续布置方式,当相邻分批张拉索的内力差作用在环索节点上的分量超过环索与索夹间的最大静止摩擦力后,会引起环索与环索夹之间的滑移.由于环索往往是索穹顶结构中预应力最大的构件,其滑移会对整体结构的内力分布和位形产生严重影响.在准确计算分析的基础上优化张拉方案,控制环索滑移对整体结构的影响是索穹顶结构能否张拉成形且满足设计要求的关键问题.本文提出基于向量式有限元的驱动索单元法进行索穹顶张拉全过程模拟,分析环索滑移对结构内力和位形变化的影响.
Cable dome structure in the process of tension is generally graded tense cable grading approach.As cable dome structure of the ring cable is usually used in a continuous arrangement, when the adjacent batch tension difference between the internal force on the cable node Of the component exceeds the maximum static friction between the cable and the cable can cause slip between the cable and the cable clip.Since the cable is often the largest prestressed cable dome structure components, The whole structure of the internal force distribution and shape have a serious impact.On the basis of accurate calculation and analysis to optimize the tension program to control the ring slip on the overall structure of the cable dome structure is able to shape and meet the design requirements of the key issues In this paper, the whole process simulation of cable dome tensioning based on the vector finite element method is proposed, and the influence of ring slip on the structural internal force and shape change is analyzed.