相关屈曲对平面钢桁架柱屈曲性能的影响

IMPACT OF INTERACTIVE BUCKLING ON BUCKLING PERFORMANCE OF PLANE STEEL TRUSSES COLUMN

利用ANSYS 14.0软件建立平面钢桁架柱模型,采用特征值屈曲分析和非线性分析方法模拟结构的整体屈曲、局部屈曲和相关屈曲(两种屈曲模式相互作用)。发现弦杆长细比对整体屈曲临界力PE和局部屈曲临界力P1的大小起控制作用,当PE>P1时,屈曲模式的相互作用降低了结构的极限承载力;当PE<P1时,屈曲模式的相互作用不仅降低了结构的极限承载力,还改变了结构的初始后屈曲性能。

The model of a plane steel truss column was set up by ANSYS 14.0. Eigenvalue buckling analysis and nonlinear structural analysis method were used to simulate the overall buckling, local buckling and interactive buckling. It was found that chord slenderness ratio dominated the overall buckling critical force PE and the local buckling critical force P1. If PEEP1, the interaction buckling modes would reduce the ultimate load of the column and if PE〈P1, the buckling mode interactions would not only reduce the ultimate load of the structure, but also change the initial post-buckling behavior of the structure.