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由于南昌站屋盖网架安装位置高、面积大、质量要求高等特点,针对传统拼装方案中装配误差大、施工难度大、安装精度难以控制等问题,结合现有空间网架拼装施工技术提出了回顶法安装方案。对传统法和回顶法两种方案的网架拼装过程进行施工仿真模拟,获得了不同方案施工过程中网架结构的挠度、应力变化规律,并进行对比分析。研究结果表明,在网架结构装配施工中,回顶法施工方案可以有效减小由装配累积误差引起的结构变形,并且网架最大应力明显减小,具有较强的适用性。胎架结构在重力荷载下的最大应力和位移均满足要求,稳定性较好,并且随着牵引点增加,胎架结构整体承载能力和变形性能在增强。
Due to the high installation position, large area and high quality requirements of the roof truss of Nanchang Railway Station, aiming at the problems of large assembly error, large construction difficulty and difficult installation precision in the traditional assembly scheme, the construction technology of the existing space truss assembly is proposed Back to the top of the installation program. The construction and simulation of the grid assembly process of the two schemes of the traditional method and the top-return method are carried out, and the deflection and stress variation rules of the grid structure during the construction of different schemes are obtained and compared. The results show that in the construction of the truss structure, the construction method of the back roof method can effectively reduce the structural deformation caused by the cumulative error of the assembly, and the maximum stress of the truss is obviously reduced, which has a strong applicability. The maximum stress and displacement of the tire-frame structure under the gravity load meet the requirements, and the stability is good. As the traction point increases, the overall bearing capacity and deformation performance of the tire-frame structure are enhanced.