作　　者： ; ; ; ;

机构地区： 同济大学土木工程学院

出　　处： 《燕山大学学报》 2010年第4期364-369,共6页

摘　　要： 对截面形式为TS40和TS61的19根550MPa高强冷弯薄壁型钢帽形截面简支檩条进行受弯试验分析其局部屈曲性能,并采用有限条程序CUFSM对这两种简支檩条局部屈曲应力进行计算分析,计算结果与试验值吻合较好。采用有限条程序对帽形截面受弯构件的翼缘宽厚比、腹板翼缘宽度比、卷边翼缘宽度比、腹板翼缘夹角等参数进行计算分析,结果表明腹板翼缘宽度比是影响帽形截面简支檩条受压翼缘局部屈曲稳定系数的重要因素。利用考虑板组相关的我国现行规范《冷弯薄壁型钢结构技术规范》(GB50018-2002)和英国冷成型薄壁构件设计标准(BS5950-5:1998)对帽形截面简支檩条受压翼缘局部屈曲稳定系数进行计算分析表明:我国规范在腹板翼缘宽度比小于1.5时偏于不安全,大于1.5时偏于保守,而英国规范相对比较安全。在参数分析的基础上,提出了考虑板组相关的帽形截面简支檩条受压翼缘弹性局部屈曲稳定系数计算公式,建议公式可供工程设计和修订规范参考。 Local buckling behaviors of 19 550 MPa high strength cold-formed thin-walled steel hat-section simply supported purlins are tested. The section forms are divided into two kinds, TS40 and TS60. The local buckling stresses of these purlins analyzed using finite strip program （CUFSM） are agreement with the test result. The effects on local buckling coefficient of compressive flange of hat-section purlin of the changes of the width-to-thickness of flange, width ratio of web-to-flange and lip-to-flange, and the angle of flange-to-web are put to analysis in details in this paper. Results show that the width ratio of web-to-flange is the most important factor effecting on the local buckling coefficient. The Chinese code ＂technical code of cold-formed thin-walled steel strucures＂ （GB50018-2002） and British standard ＂code of practice for design of cold formed thin gauge sections＂ （BS5950-5： 1998） which all consider the plate assembly effect are used to calculate the local buckling coefficient. The results calculated using codes show that the Chinese code is unsafe and too conservative as the width ratio of web-to-flange being more and less than 1.5 respectively, and the British standard is safe. Based on parametric analyses, a proposed method to predict the local buckling coefficient of compressive flange of hat-section purlin is presented in order to provide reference for designs and revision of specifications.

关 键 词： 高强冷弯薄壁型钢 帽形截面 檩条 局部屈曲 板组效应 有限条

领　　域： [建筑科学] [建筑科学]