轧制H型钢单伸臂梁的弹性弯扭屈曲分析

Analyses of flexural-torsional buckling of rolling H-section steel mono-overhanging beam

对热轧H型钢单伸臂梁受均布荷载作用时的弹性弯扭屈曲进行了分析.认为全跨作用均布荷载的单伸臂梁当控制截面位于简支段时,可以近似简化为端部受集中力偶和全跨受均布荷载作用的简支梁.运用能量法提出了端部受集中力偶和全跨受均布荷载作用的简支梁的临界弯矩计算公式,辅以ANSYS有限元对单伸臂梁进行屈曲分析,将其有限元结果与理论公式的计算结果进行分析比较.研究结果表明,所提出的计算公式有比较高的计算精度.

A study on flexural-torsional buckling of rolling H-section Steel mono-overhanging beam under uniform load is carried out.It assumes that when the control section of mono-overhanging Beam under uniform load is on the simply supported part,it can be simplified as a simply supported beam under uniform load and a concentrated couple.This paper has derived the formula of critical moment of simply supported beam under uniform load and a concentrated couple by using energy method,and compared the results by ANSYS finite element analysis,and the proposed formula is accurate enough.