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通过对一倒圆角三角形弦支穹顶结构4种预应力方案的静力分析,比较了不同的预应力设置方案下结构的最大竖向位移、上部网壳构件的最大轴力和支座径向位移。在此基础上提出了进一步提高此类结构受力性能指标的综合优化方案。分析结果表明:在选择预应力优化方案时为防止结构变形和预应力损失的影响,需要对结构进行形态分析;最优的预应力方案是在几何法和刚性索法的基础上得出的,预应力方案的选择需要基于结构的各项性能指标来综合判断。
Through the static analysis of four kinds of prestress schemes of a round chamfered triangular chord structure, the maximum vertical displacement, the maximum axial force of the upper shell member and the radial Displacement. On this basis, a comprehensive optimization scheme to further improve the mechanical performance of such structures is proposed. The results show that in order to prevent the influence of structural deformation and prestress loss in the selection of prestressed optimization scheme, the structure analysis needs to be carried out. The optimal prestressing scheme is based on geometric method and rigid rope method, The selection of prestress options needs to be judged synthetically based on the various performance indicators of the structure.