腹板开孔冷弯薄壁钢轴压构件畸变屈曲承载力试验研究  

Distortional buckling experiments on cold-formed thin-walled steel lipped channel columns with circle holes under axial compression

作　　者：谭政[1,2] 姚行友[1,2] 汪洋[1,2] 石梦婷[1,2] 刘忠勇[1,2] 朱丽芳[1,2] 曾罗兰 

机构地区：[1]南昌工程学院江西省水利土木特种加固与安全监控工程研究中心,江西南昌330099 [2]南昌工程学院土木与建筑工程学院,江西南昌330099

出　　处：《南昌工程学院学报》2015年第6期14-18,共5页Journal of Nanchang Institute of Technology

基　　金：国家自然科学基金资助项目(51308277);<冷弯薄壁型钢结构技术规范>国家标准管理组专题研究项目;江西省科技厅自然科学基金项目(20151BAB206055);江西省教育厅科学技术研究项目(GJJ14760);江西省大学生创新创业计划项目(201411319004)

摘　　要：对26根屈服强度235MPa腹板开圆孔冷弯薄壁型卷边槽钢截面轴压构件进行畸变屈曲承载力试验研究,分析了构件屈曲模式和极限承载力,采用国家规范GB50018—2002《冷弯薄壁型钢结构技术规范》计算构件承载力、非线性有限元数值模拟结果与试验结果进行分析比较。在此基础上,对腹板开孔冷弯薄壁型钢截面轴压构件的承载力合理计算模式进行研究。结果表明,对于中等长度腹板开孔冷弯薄壁型钢截面轴压构件主要出现畸变屈曲模式;腹板开孔在对构件畸变屈曲稳定承载力有一定的降低作用,采用折减构件有效截面面积的方法可计算开孔构件的畸变屈曲稳定承载力。This paper aims to research the distortional buckling mode and load-carrying capacity of cold- formed thin-walled steel members with holes. Compression tests were conducted on 26 intermediate length columns with and without web holes. The comparison of ultimate strength between test results and calculated results using Chinese code Technical code of cold-formed thin-wall steel structures GB50018-2002 and nonlinear finite element method are made. The calculated method for cold-formed thin-walled steel columns with web holes is proposed. The results show that the distortional buckling mode would usually occur for the intermediate length axial compression. The web holes have a little influence on the distortion- al buckling ultimate strength of columns. The ultimate strength can be predicted using a reduced effective area.

关 键 词：腹板开孔 冷弯薄壁型钢 轴压构件 畸变屈曲 承载力 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1