冷弯薄壁卷边槽钢组合工字梁极限承载力计算的折减强度法  

STRENTH-REDUCTION METHOD FOR LOAD-CARRYING CAPACITY OF COLD-FORMED STEEL COMPOSITE I-BEAM

作　　者：石宇[1] 周绪红[1,2] 聂少锋[1] 苑小丽[2] 

机构地区：[1]长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710061 [2]兰州大学西部灾害与环境力学教育部重点实验室,甘肃兰州730000

出　　处：《工程力学》2011年第9期174-182,共9页Engineering Mechanics

基　　金：国家自然科学基金项目(50978128);中央高校科研专项基金项目;长安大学基础研究专项基金项目(CHD2009JC036)

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3种截面形式共计9根卷边槽钢组合工字梁进行了破坏性试验研究,并采用有限元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,验证了该文有限元方法的有效性。然后对典型截面梁构件进行了大量的参数分析,研究结果表明:随着钢材强度提高、梁长度减小、腹板高厚比和翼缘宽厚比增加,梁的极限承载力增加。最后在参数分析的基础上,提出了计算冷弯薄壁型钢梁极限承载力的折减强度法及其相应的计算公式,并通过试验验证了该文折减强度法计算梁极限承载力的适用性。In order to investigate the bending behavior of cold-formed steel I-beams, a total of 9 cold-formed I-beams with three different sections were tested. And tests were simulated by finite element analysis. The well fitting between finite element analysis and test results proves the validity of the finite element method in this paper. Then a large number of parametric analyses were carried out through the finite element analysis on typical members and the following conclusions can be obtained： with the increase of steel strength, the decrease of beams＇ length, the increase of height-to-thickness ratio of the web and width-to-thickness ratio of flanges, the members＇ load-carrying capacity increases. Finally, strength-reduction method for the ultimate load-carrying capacity of cold-formed I-beam was proposed, and the ultimate load-carrying capacity from this method agrees well with the experiment results, so the strength-reduction method in this paper is valid and can be applied to practical engineering.

关 键 词：冷弯薄壁型钢 卷边槽钢 组合工字梁 极限承载力 折减强度法 

分 类 号：TU391[建筑科学—结构工程]