Levy型劲性支撑穹顶静力性能分析

Analysis on static behavior of Levy Rigid Bracing Domes

Levy型劲性支撑穹顶结构是在佐治亚索穹顶基础上改进提出的新型预应力空间结构,其上部为空间索网体系,下部为刚性杆支撑体系,该结构可以改善索穹顶施工张拉成形存在的技术难题.本文基于ANSYS软件,采用非线性完全牛顿拉夫逊法,分析了Levy型劲性支撑穹顶结构在荷载分布、荷载大小、初始预应力、矢高、跨度和环向等分数等参数改变时,结构性能的变化规律.结果表明,Levy型劲性支撑穹顶结构具有整体刚度好,内力分布合理等优势,算例分析给出了结构参数取值的建议,可供工程设计参考.

Levy Rigid Bracing Dome structure is a new pre-stressed spatial structure based on Georgia Dome.The upper part is a spatial cable net,and the lower part is a rigid rod support system.The system overcomes the shortage of inconvenient construction of cable domes.In this paper,static performances of Levy Rigid Bracing Domes were analyzed with Newton-Raphson method using ANSYS.The uniformly distributed load for full-span and half-span were applied to the structure respectively and geometric nonlinearity was considered in the analysis.The influence of structural parameters such as initial prestressing,span and rise was discussed.Results from numerical example indicate good static performance of Levy Rigid Bracing Dome.Some useful conclusions were obtained through parameter analysis,and structural parameter recommendations were given.References were given for structural design and engineering application of Levy Rigid Bracing Domes.