冷弯薄壁卷边槽钢组合工字梁极限承载力计算的有效宽度法  

Effective width method for load-carrying capacity of cold-formed steel composite I-beams

作　　者：石宇[1] 周绪红[1,2] 苑小丽[2] 聂少锋[1] 

机构地区：[1]长安大学,陕西西安710061 [2]兰州大学,甘肃兰州730000

出　　处：《土木工程学报》2011年第6期8-17,共10页China Civil Engineering Journal

基　　金：国家自然科学基金(50578013)

摘　　要：为了研究冷弯薄壁卷边槽钢组合工字梁的受弯性能,对三种截面形式共计9根卷边槽钢组合工字梁进行破坏性试验研究,建立有限元分析方法对试件进行模拟分析,有限元计算结果与试验结果吻合良好,验证了有限元方法的正确性。接着采用有限元方法对冷弯薄壁卷边槽钢组合工字梁进行大量参数分析,钢种和受压翼缘宽厚比对受压翼缘有效宽厚比的影响较大,梁的长度、腹板高厚比与板件厚度对梁受压翼缘有效宽厚比的影响小。最后在对典型截面梁构件进行参数分析的基础上,得出卷边槽钢组合工字梁受压翼缘板件的有效宽厚比计算表格与计算公式,提出计算冷弯薄壁型钢梁极限承载力的有效宽度法,并通过试验验证了有效宽度法计算梁极限承载力的正确性和适用性。In order to investigate the bending behavior of cold-formed steel composite I-beams,a total of 9 cold-formed composite I-beams of three different sections are tested.There is good agreement between finite element analysis and the test results.Parametric analyses are carried using the finite element model and the following conclusions can be obtained： the steel category and width-to-thickness ratio of the flanges significantly influence the effective width-to-thickness ratio of the compressed flanges,while the length of the beam,the height-to-thickness ratio of the web,and the thickness of the steel plate exert relatively small influence.Tables and formulas for effective width-to-thickness ratio of the compressed flanges are obtained from finite element analysis of typical composite I-beam,and an effective width method for ultimate load-carrying capacity of cold-formed composite I-beams is proposed.The ultimate load-carrying capacity from using the effective width method agrees well with the experiment results.

关 键 词：冷弯薄壁型钢 卷边槽钢 组合工字梁 极限承载力 有效宽度法 

分 类 号：TU375.4[建筑科学—结构工程]