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某屋盖采用圆钢管拱桁架结构,单榀拱桁架两端支承于立体钢桁架上,该结构的整体稳定性是设计的重点。考虑完善及带缺陷结构两种情况,对单榀及多榀拱桁架子结构进行几何非线性稳定分析,得到了临界荷载与位移的关系曲线。分析结果表明:初始缺陷及几何非线性对该结构的稳定承载力有一定的影响,设计中应加强有关支撑来提高结构的整体稳定性。
A roof with round steel arch truss structure, single arch truss both ends supported on the three-dimensional steel truss, the overall stability of the structure is the focus of the design. Considering the perfect and defective structure, the geometrical nonlinear stability analysis of single 榀 and multiple 榀 arch truss substructure was carried out, and the relationship curve between critical load and displacement was obtained. The analysis results show that initial defects and geometrical nonlinearity have certain influence on the stability of the structure, and the support should be strengthened to improve the overall stability of the structure.