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轴压钢管的失稳模式主要包括整体柱型失稳和局部壳型失稳。当钢管构件的长细比和径厚比都比较大时,可能会发生上述两种失稳模式的耦合,其中钢管局部屈曲先于整体屈曲发生的变形模式会显著降低其极限承载力。将经典板壳力学中的圆柱壳理论应用于轴压钢管的稳定分析,推导得出以长细比和径厚比为控制参数的临界算式以判断轴压钢管整体屈曲和局部屈曲的先后顺序,并结合AISI(2007)的局部屈曲设计准则以计算大径厚比钢管构件的稳定承载力。同时开展了Q345钢管轴压承载力的试验和相应的有限元分析,结果表明:上述临界算式能有效地判断轴压钢管的失稳模式,且AISI(2007)能正确计算大径厚比钢管稳定承载力。
The instability modes of the axial compression steel pipe mainly include the overall cylindrical instability and partial shell instability. When the slenderness ratio and the ratio of diameter to thickness of steel pipe members are relatively large, the coupling of the above two kinds of instability modes may happen. The local buckling of steel pipe before deformation of the whole buckling will significantly reduce the ultimate bearing capacity. The classical cylindrical shell mechanics theory is applied to the steady analysis of the axial compression steel pipe. The critical formula of the slenderness ratio and the ratio of diameter to thickness is deduced to determine the overall order of buckling and local buckling of the axially compressed steel pipe. Combined with the local buckling design criterion of AISI (2007), the stability bearing capacity of steel pipe members with large diameter-thickness ratio is calculated. At the same time, the bearing capacity of Q345 steel tube was tested and the corresponding finite element analysis was carried out. The results show that the above critical formula can effectively determine the instability mode of the axially compressed steel tube, and AISI (2007) Carrying capacity.