冷弯薄壁型钢C型构件压弯屈曲机理与滞回模型研究  

Research on hysteretic model and buckling mechanism of cold-formed C-section steel column

作　　者：杨娜[1] 彭雄[1,2] 

机构地区：[1]北京交通大学,北京100044 [2]北新集团建材股份有限公司,北京102208

出　　处：《土木工程学报》2015年第3期25-33,共9页China Civil Engineering Journal

基　　金：中央高校基本科研业务费专项基金(2012JBM007);新世纪优秀人才支持计划(NCET-11-0571);国家自然科学基金(51422801,50778019)

摘　　要：对冷弯薄壁型钢C型构件进行竖向常轴力作用与水平循环荷载同时作用下的加载试验,以探索冷弯薄壁型钢C型构件滞回性能特点以及轴压比、截面宽厚比等参数对试件破坏行为的影响。基于截面应力分布规律和薄板屈曲理论,提出格构机理模型,试验和数值模拟结果验证了该模型的合理性;采用数值模拟方法,分析薄壁构件压弯屈曲机理,获得薄壁C型构件滞回曲线特征,总结影响其滞回性能的关键影响参数。研究表明:大轴压比对试件滞回性能有极大的削弱作用;过早出现的局部屈曲是薄壁C型构件破坏的关键原因;提出的滞回模型能够体现局部屈曲对构件滞回性能的影响。Several specimens are loaded with axial force and horizontal cyclic force,in order to obtain the hysteretic performance and the influence of axial compression ratio and aspect ratio on the buckling performance. By applying the mechanism model and comparing data of FEM and the test,the buckling mechanism of thin-walled specimens are researched and the hysteresis curves and key factors are obtained as well. The research reveals that big axial compression ratio brings a serious decrease on hysteretic performance and local buckling plays a great negative role during the loading process. Lastly,based on the conclusion of hysteretic characteristics of cold-formed C-section steel columns,the mechanism model is used for the theoretical derivation and numerical fitting on the hysteresis model including the skeleton curve and stiffness degradation law. This hysteresis model reflects the influence of local buckling on hysteretic behavior,which at the same reveals the hysteresis characteristics of thin-walled specimens under hysteretic load.

关 键 词：C型冷弯薄壁型钢 屈曲机理 滞回模型 试验研究 数值模拟 

分 类 号：TU392.1[建筑科学—结构工程]