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在役空间网格结构中轻微锈蚀的轴心受力圆钢管构件数量庞大，但其受拉、受压性能劣化规律研究不足。本文选取某客站屋盖外露服役25年的初始涂层失效后锈蚀Q235圆钢管支撑，进行轴心受拉及受压试验，观察其破坏模式并获取承载力。采用3D激光扫描建立精细化有限元模型，校核非线性分析方法后，改变锈蚀率并结合构件的初始几何缺陷开展参数研究，以揭示锈蚀后圆钢管承载力退化规律。结果显示：轻微锈蚀使构件处于小偏心受力状态；受拉构件以材料强度破坏为主，受压构件则因偏心作用提前发生弹塑性失稳。受压稳定极限承载力随锈蚀率增加呈先骤降后缓降趋势，且构件对初始几何缺陷的敏感性随锈蚀加深而降低。
Abstract：A large number of axially loaded circular steel tubular members with shallow rust damage exist in in-service space grid structures， but the research on the degradation laws of their tensile and compressive performance is insufficient. In this paper， the initial coating rusted Q235 circular steel tubular support members exposed to service for 25 years in a certain passenger station roof were selected to conduct axial tension and compression tests， to observe their failure modes and obtain the bearing capacity. A refined finite element model was established by 3D laser scanning. After verifying the nonlinear analysis method， the parameter study was carried out by changing the corrosion rate and combining with the initial geometric defects of the members to reveal the degradation law of the bearing capacity after corrosion. The results show that shallow corrosion causes the members to change from axial loading to small eccentric loading; the tensile members mainly fail due to material strength， while the compressive members experience elastic-plastic instability earlier due to eccentricity. The ultimate compressive stability bearing capacity decreases sharply at first and then slowly with the increase of the corrosion rate， and the sensitivity of the members to the initial geometric defects decreases with the deepening of corrosion.
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基本信息:
中图分类号:TU392.3;U291.6
引用信息:
[1]冯海龙,杜坤,占重志.轻微锈蚀轴心受力圆钢管承载力劣化规律研究[J].铁道建筑().
基金信息:
中国铁道科学研究院集团有限公司基金（2024YJ268）
2026-05-19
2026-05-19
2026-05-19