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武汉某体育馆屋盖采用圆钢管拱桁架结构,单榀拱桁架的截面形式为倒三角形,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线性屈曲、几何非线性稳定及弹塑性非线性稳定分析,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影响不明显,而材料非线性的影响显著,加强平面外支撑对于提高结构的整体稳定性具有重要作用。
The roof of a gymnasium in Wuhan adopts the round steel tube arch truss structure. The section form of the single arch truss is inverted triangle, and both ends are supported on the three-dimensional steel truss. The overall stability of the structure is the key point of the design. Considering both perfect and defect structure, the linear buckling, geometric nonlinear stability and elasto-plastic nonlinear stability analysis of single 榀 and multiple 榀 arch truss substructure were studied. The critical load versus displacement curve was obtained. The results show that initial imperfection and geometric nonlinearity have no obvious effect on the stability of the structure, but the effect of material nonlinearity is significant. Strengthening out-of-plane support plays an important role in improving the overall stability of the structure.