【摘要】 西北大学长安校区体育馆为新型弦支空间结构，其屋盖结构部分上部由辐射状倒三角管桁架结构组成，下部由环向索及径向索组成，上部结构与下部结构之间通过竖向撑杆连接，是一种复杂的空间预应力结构体系.采用有限元软件对该结构进行了施工过程仿真分析，研究了不同施工阶段结构的应力和变形；并对拉索分级张拉产生的结构应力与变形进行了分析，研究了不同卸载方案对结构性能的影响，提出了合理的结构卸载方案.结果表明：结构安装所采用的旋转累积滑移施工成型方案是合理的，施工过程中结构应力和变形较小；结构整体刚度随施工过程不断增大，应力呈现不均匀分布.施工过程仿真分析可以为结构现场安装提供指导与预警，为同类工程建造提供技术参考.更多还原

【Abstract】 The gymnasium of Northwestern University Chang′an Campus is a new type of chord-supported space structure, which is a complex spatial prestressed structural system. The upper part of the roof structure is composed of a radial inverted triangular tube truss structure, the lower part is composed of circumferential cables and radial cables, and the upper structure and the lower structure are connected by vertical struts. In this paper, finite element software is used to simulate and analyze the construction process of the structure, and the stress and deformation of the structure in different construction stages are studied. The structural stress and deformation caused by cable tension are analyzed, the influence of different unloading schemes on structural performance is studied, and a reasonable structural unloading scheme is proposed. The results show that the rotary cumulative slip construction scheme adopted for the structure installation is reasonable, the structural stress and deformation are small during the construction process. The overall stiffness of the structure increases with the construction process, and the stress is unevenly distributed. The simulation analysis of the construction process can provide guidance and early warning for the on-site installation of the structure, and provide technical reference for the construction of similar projects.更多还原