门式刚架斜梁隅撑内力的有限元法弹性分析

The Elastic Finite Element Method on the Internal Force of Knee-Braces in Portal Frame Structure

针对门式刚架钢结构中常用的隅撑,根据隅撑刚度分析和弯扭稳定分析,考虑梁的初始侧移,研究了使梁的临界弯矩达到屈服弯矩时隅撑中的内力,这个内力即是对隅撑的强度要求,据此编制隅撑内力分析的有限元程序,通过算例结果表明具有较高的计算精度。

The study has investigated the buckling of beams braced by purlin - knee - bracing system. Relation between buckling moment and bracing stiffness is analysed by FEM. Finally the initial out - of - plane deflection and initial twisting of the beam is considered to find the bracing forces when the buckling moment reaches the yield moment of the beam. The process by finite element method on the internal force of knee - braces is compiled. The results has shown that the calculation precision is higher than before.