冷弯薄壁构件屈曲模态力学准则的有限元验证

Finite element verification of the mechanic criteria of cold-formed thin-walled steel member's buckling mode definitions

现有冷弯薄壁型钢设计规范中需要获知薄壁结构各个模态屈曲特性,如局部板件屈曲、畸变屈曲和整体屈曲。从工程设计需要出发,系统介绍约束有限元条分法的基础理论及进展,并着重阐述其在区分屈曲模态时的相关力学假设。对于由这些力学假设定义的模态是否正确,基于有限元静力分析从一个全新的角度验证其合理性。

In current cold-formed thin-walled steel design specifications,buckling information of all the three types,local-plate buckling,distortional buckling and global buckling（or Euler buckling）,are desired.From the desire of practical design,the basic theory of constrained finite strip method（cFSM） was systematically introduced and new progress was presented.An emphasis had been put on the associated mechanic assumptions for defining the buckling modes.For these mechanic assumptions,a brand-new view in terms of the definition of buckling modes was illustrated via the static finite element analysis to verify its validity.