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大跨扶梯钢桁架结构现场加载试验与分析

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某商场自动扶梯大跨度钢桁架结构需要检测其在正常使用极限状态下的挠度与应力,该钢桁架水平跨度47.9 m,仅在两端设有支座,整体悬空且最高处离地面35 m.现场难以采用直接堆载方式加载,故提出一种空间加载系统.在桁架节点处悬挂精轧螺纹钢筋,以地下室楼板作为反力装置,利用千斤顶完成加载.首先对加载系统进行承载力、整体稳定及局部稳定验算,采用SAP2000有限元软件对地下室梁板结构进行验算,发现竖向拉力会导致原结构梁板开裂,因此选择在板上堆载的方式以减少拉力对原结构的影响.现场试验结果表明,该加载系统对原地下室梁板结构未造成损害,钢桁架实测挠度和应力情况与原结构设计计算相符.
ON-SITE LOAD EXPERIMENTS AND ANALYSIS FOR A LARGE-SPAN ESCALATOR STEEL TRUSS STRUCTURE
A large-span steel structure truss of the escalator in a shopping mall needed to be tested for deflection and stress in the normal limit state. The horizontal span of the steel truss is 47.9 m, equipping with supports at both ends, which is suspended 35m. A space-leading system is proposed for testing this truss, in which the steel bars are hung at the truss joints, and the basement floor is used as the reaction device that is loaded with the jack. After that, the bearing capacity, overall stability, and local stability of the loading system are checked. To prove that the beam and plate structure would be ripped by the vertical force, SAP2000 finite element software is used to check it. Then, the way of stacking on the floor is designed to balance the force. The on-site load testing results showed that there was no damage to the original basement beam and slab structure. Furthermore, the experiment concluded that the de-flection and stress of the steel truss were consistent with the design.

large-span steel truss structurespace-leading systemsteel truss deflection

常志远、王震宇、满艺群、王代玉、张辰熙

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烟台大学土木工程学院,山东烟台264005

哈尔滨工业大学土木工程学院,哈尔滨150090

哈尔滨工业大学交通科学与工程学院,哈尔滨150090

黑龙江省寒地建筑科学研究院,哈尔滨150080

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大跨钢桁架结构 空间加载系统 钢桁架挠度

2024

低温建筑技术
黑龙江省寒地建筑科学研究院

低温建筑技术

影响因子:0.237
ISSN:1001-6864
年,卷(期):2024.46(3)
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