摘要
以理论研究成果为基础,结合应用有限条屈曲分析程序,对冷弯薄壁卷边槽钢在偏心受压和纯弯曲下的弹性畸变屈曲荷载进行了分析.基于对轴心受压和纯弯曲两种极端荷载情况下畸变屈曲荷载的参数分析,提出了屈曲临界半波长度和考虑翼缘自身剪切与畸变影响的修正参数的近似计算公式;对腹板提供给翼缘板的转动约束刚度进行了讨论,提出了精度较高的线性计算公式;利用以上结果,提出了确定冷弯薄壁卷边槽钢在偏心受压和纯弯曲下的弹性畸变屈曲荷载简化公式.比较研究表明,简化公式具有足够的精度,便于手算,实用性强,可供工程设计人员和各国冷弯薄壁型钢设计规范修订相应内容时参考.
The determination of the elastic distortional buckling loads of the cold-formed lipped channel sections subjected to the eccentric compression and the pure bending was performed based on the analytic solutions combined with the finite strip buckling analyses. The parameter analyses were carried out an the distortional buckling under two extreme load cases of axial compression and pure bending, leading to an approximate formulae for predicting the buckling half-wavelength and the modified factor to take into account the effect of the shear and distortional deformation of the flange section. The rotational restraint, provided by the web to the flange during buckling deformation, was then examined, and a more accurate linear approximate expression for the rotational restraint and the web stress was proposed. Based on these approximate formulae/expressions, the two simplified formulae were finally developed to predict the elastic distortional buckling loads of the cold-formed lipped channel sections subjected to the eccentric compression and the pure bending. These two proposed formulae are shown to be accurate through comparisons with the results of finite strip buckling analyses, easy to be applied, may be used in practical applications and taken account into design codes and guidelines. A simple example was also included in the study.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2008年第9期1494-1501,共8页
Journal of Zhejiang University：Engineering Science
关键词
冷弯薄壁型钢
卷边槽钢
畸变屈曲
偏心受压
纯弯曲
简化公式
cold-formed steel
lipped channel section
distortional buckling
eccentric compression
pure bending
simplified formulae
