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镇江体育会展馆屋盖属于大跨度张弦桁架结构.首先以整体结构为研究对象,除对单榀张弦桁架进行设计外,着重对张弦桁架的侧向支撑进行了简化和优化设计.根据本工程的特点,沿整体桁架四周增加了对称拉索.然后对优化前后结构的力学性能进行了分析.分析结果表明:优化后结构更加简单,施工安装难度大大降低,结构应力峰值减小,结构挠度减少;优化后结构的基频增加,地震响应峰值减小,竖向刚度大大增加,结构抵抗地震能力增强.因此,张弦桁架结构优化分析应根据整体结构的特点,除进行单榀张弦桁架优化外还应重视其侧向支撑的设计优化.
The roof of Zhenjiang Sports Association Pavilion belongs to the long-span truss string structure.Firstly, with the overall structure as the research object, besides the design of the truss strings, the lateral truss truss lateral support is simplified and optimized. According to the characteristics of the project, symmetrical cables are added along the whole truss frame, and then the mechanical properties of the structure before and after optimization are analyzed.The results show that the optimized structure is simpler, the difficulty of construction and installation is greatly reduced, the peak of structural stress is reduced, The structural deflection decreases; the fundamental frequency of the structure increases, the peak value of the seismic response decreases, the vertical stiffness increases greatly, and the structural resistance to seismic capacity increases.Therefore, the optimization analysis of the truss string structure should be based on the characteristics of the overall structure, Strings truss optimization should also pay attention to its lateral support design optimization.