受弯钢梁整体稳定计算的讨论  

Discussion on the Calculation of Overall Stability of Bending Steel Beams

作　　者：韩忠亮 HAN Zhong-liang(Guangdong Nanfang Institute of Technology,Jiangmen 529000,China)

机构地区：[1]广东南方职业学院,广东江门529000

出　　处：《工程建设与设计》2020年第14期19-20,共2页Construction & Design for Engineering

摘　　要：受弯钢梁发生弯扭屈曲时,现有理论和现行规范的临界弯矩公式只适用于梁处在弹性工作阶段.实际上,钢梁发生弯扭屈曲常处于弹塑性工作状态,国家标准以修正整体稳定系数φb'代替φb,而φb''和φb表达式为反比例线性关系,相对简单.建议在弹塑性阶段,以φb'为依据,在整体稳定性计算公式中加入截面塑性发展指数.When flexural buckling occurs,the existing theoretical and normative formulae of critical bending moment only apply to the elastic working stage of the beam.In fact,bending and torsion of steel beams are usually in the elastic-plastic working state.The modify overall stability coefficient φb is replaced by φb' in the national standard,and the expressions for φb' and φb are inversely proportional linear,which is relatively simple.In the elastic-plastic stage,based on φb',it is suggested to add the cross section plasticity development index to the global stability calculation formula.

关 键 词：临界弯矩 整体稳定系数 弹性工作阶段 弹塑性工作阶段 截面塑性发展指数 

分 类 号：TU311.2[建筑科学—结构工程]