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局部屈曲显著影响薄壁受压构件的性能。局部屈曲将会引起薄壁构件失去轴向受压刚度,并导致受压承载力显著降低。用有限元模拟薄壁工字型和箱型截面压杆的屈曲后效应,并考虑了构件几何初始缺陷和材料非线性影响,给出了局部屈曲后应力发展和应力重分布、荷载作用下开始屈服和屈服发展的详细计算。详细介绍了构件截面平面内板件交点的平面内位移边界条件的影响和基于屈曲后刚度的屈服和破坏。结果显示,几何初始缺陷在屈曲和屈服几乎同时发生的杆件和设计最终破坏和卸载的杆件中的影响非常突出。一般地,几何初始缺陷影响与截面板件交点沿压杆长度的屈服发展和沿截面板件的中部发展有同等重要的地位。
Local buckling significantly affects the performance of thin-walled compression members. Local buckling will cause the thin-walled members to lose axial compressive stiffness and lead to a significant reduction of compressive bearing capacity. The finite element method was used to simulate the post-buckling effect of thin-walled and box-section bar, and considering the initial geometric imperfections and material nonlinearities, the stress development and stress redistribution after local buckling were given. Yield and yield yield the detailed calculation. The effects of the in-plane displacement boundary conditions at the intersection point of the in-plane plate members and the yield and failure based on the post-buckling stiffness are introduced in detail. The results show that the geometric initial imperfections are very prominent in the rod and the rod that the design eventually destroyed and unloaded, which occurs almost simultaneously with buckling and yielding. In general, the initial geometric imperfections affect the yield point along the length of the bar with the intersections of the sections and have an equally important position along the middle of the sections.