卷边翼缘工形截面梁的稳定性能及设计方法  

LATERAL STABILITY BEHAVIOR OF LIPPED H-SECTION BEAMS SUBJECTED TO MOMENTS

作　　者：郭彦林[1] 张婀娜[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《工业建筑》2009年第9期15-21,共7页Industrial Construction

摘　　要：基于大挠度弹塑性板壳有限元分析方法,系统地研究了卷边工形梁在两端等弯矩作用下的失稳机理与稳定承载力,揭示了卷边工形截面构件的局部屈曲、畸变屈曲、整体侧向失稳以及它们之间的相互作用。系统地分析了截面宽高比、腹板高厚比、翼缘宽厚比、长细比等构件参数对侧向稳定承载力的影响,并基于大量的数值计算数据给出了卷边工形梁在两端等弯矩作用下的稳定承载力设计公式,可为规范修订以及工程设计提供依据。Lateral instability behavior of lipped H-section beams subjected to moments are investigated theoretically based on large deformation and material elastic-plasticity finite shell element analysis. Three possible failure modes will be involved in analysis, namely, plate local buckling, distortiona] buckling, overall buckling failure, and the interaction between them, in the case of lip＇ s width coefficient of lipped H-section beams reaching an optimal value. The influence of both sectional geometric parameters and slenderness on lateral stability behavior of beams is apalyzed systematically. Finally, based on the numbers of FEA numerical results obtained, the proposed formulas are given for predicting lateral stability capacity of lipped H-section beams under moments, which will be used in the further modification of Chinese code for steel structural design and that of engineering structures as well.

关 键 词：卷边工形梁 局部失稳 畸变失稳 侧向失稳 稳定承载力 

分 类 号：TU392.1[建筑科学—结构工程]