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索穹顶结构是一种结构效率极高的大跨预应力空间结构,适用于体育馆、展览会馆等大跨度场馆的屋盖结构.为解决传统索穹顶结构脊索易发生松弛、斜索数量多等不足,丰富索穹顶结构方案,提出一种新型预应力空间结构——脊杆环撑索穹顶结构,具有无脊索松弛现象、承载能力提高、斜索数量少等优点.建立了脊杆环撑索穹顶的有限元模型,进行静力分析,研究结构在满跨、半跨均布活荷载的组合工况下弹性阶段的受力特点.进一步进行参数分析,探讨了结构基本参数对脊杆环撑索穹顶的杆件内力、节点位移及失效荷载的影响规律.分析结果表明,脊杆环撑索穹顶具有良好的静力性能,避免了脊索易松弛退出工作的缺点,结构整体刚度大于传统索穹顶,施工难度降低.结合初始预应力、矢跨比、斜索与水平夹角、构件截面及总截面面积等结构参数的影响规律,给出结构设计建议,为脊杆环撑索穹顶结构的工程应用提供依据.
The cable dome structure is a large-span prestressed spatial structure with high structural efficiency and is suitable for the roof structure of large-span stadiums such as gymnasiums, exhibition halls, etc. In order to solve the problems that the conventional cable dome structure is prone to relaxation of the chord, , Which enriches the structure scheme of cable dome and proposes a new type of prestressed spatial structure - the structure of the dome of the chord ring, which has the advantages of loose ridges relaxation, higher carrying capacity and fewer inclined cables. The finite element model was used to analyze the force characteristics of the elastic phase under the combined working conditions of full span and semi-span uniform live loads.Furthermore, the parametric analysis was conducted to investigate the effect of the basic parameters of the structure on the support of the spinal rod ring The results show that the dome of the chord ring has a good static performance and avoids the shortcomings of the chordal cord being easily relaxed and withdrawn from work.The overall stiffness of the structure is greater than that of the traditional cable dome, The construction difficulty is reduced.According to the influence law of initial prestressing force, span-to-span ratio, the included angle between inclined cable and horizontal plane, component cross section and total cross-sectional area, Design recommendations to provide a basis for the ridge pole ring hold the cable dome structure engineering applications.