摘要
基于能量法对冷弯薄壁型钢卷边槽形截面的弹性畸变屈曲应力进行了推导分析,得到相应畸变屈曲半波长、畸变屈曲应力以及稳定系数计算公式。通过与有限条法进行对比分析,表明推导出的畸变屈曲应力计算方法具有较高的精度和较好的适用性。在此基础上,建立了冷弯薄壁型钢卷边槽形截面部分加劲板件弹性局部和畸变屈曲稳定系数的统一计算公式。最后通过算例分析,验证了该文提出方法的合理性和适用性,相对于中国现行《冷弯薄壁型钢结构技术规范》能够更加准确的计算部分加劲板件的屈曲稳定系数及卷边槽形截面构件的稳定承载力。
The half-wave length, the elastic buckling stress of the distortional-buckling of cold-formed thin-walled steel members with lipped channel sections and the corresponding stability coefficient of partially stiffened elements are developed, based on the energy method. With the comparison among the calculated results of elastic buckling stress using the proposed method and the finite strip method, the suitability and good precision of the developed method are illuminated. Then, a uniform formula for the stability coefficient of partially stiffened elements considering both local and distortional buckling effects is established. Finally, with examples' analysis, it is shown that the proposed uniform formula has higher precision to calculate the stability coefficient of partially stiffened elements and the ultimate load-carrying capacity of cold-formed thin-walled steel members with lipped channel sections, comparing that of the current method provided by the technical code of cold-formed thin-walled steel structures(GB50018-2002).
出处
《工程力学》
EI
CSCD
北大核心
2014年第9期174-181,共8页
Engineering Mechanics
基金
国家自然科学基金项目(51078288
51308277)
江西省教育厅科学技术研究项目(GJJ14760)
关键词
冷弯薄壁型钢
部分加劲板件
能量法
畸变屈曲
局部屈曲
稳定系数
cold-formed thin-walled steel
partially stiffened elements
energy method
distortional buckling
local buckling
stability coefficient
