开口冷弯厚壁型钢组合截面轴压构件抗震性能研究  

Study on the seismic behaviors of opening cold-formed thick-walled steel built-up sections under the axial cyclic loading

作　　者：付小超 温东辉[2] 张文莹 FU Xiaochao;WEN Donghui;ZHANG Wenying(Digital Construction Institute,Shanghai Urban Construction Vocational College,Shanghai 200438,China;Department of Architecture and Environmental Engineering,Taiyuan University,Taiyuan 030032,China;Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]上海城建职业学院数字建造学院,上海200438 [2]太原学院建筑与环境工程系,山西太原030032 [3]北京工业大学城市建设学部,北京100124

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第6期810-818,共9页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金青年项目(52008008);上海城建职业学院校级科研项目(cjky202317);2023年上海高校青年教师培养资助计划入选项目。

摘　　要：为研究开口冷弯厚壁型钢组合截面构件在轴向滞回荷载作用下的抗震性能,选取了3根由壁厚t=3 mm、8 mm冷弯单槽钢组合而成的工字形组合截面构件,对其进行轴向滞回加载试验.分析不同试验现象及破坏模式,初步讨论了长细比、宽厚比对构件抗震性能影响,并与单截构件性能对比.在与试验结果对比吻合度较好的基础上,建立精确的ANSYS有限元模型,选取不同腹板宽厚比(h/t=20~50)、不同长细比(λy=30~90)的构件进行参数化分析.研究结果表明:组合截面构件延性较单截面构件要好,失稳破坏延后;宽厚比、长细比是影响冷弯型钢抗震性能的两个主要因素,宽厚比(h/t)越大抗震性能越差,长细比(λy)越大抗震性能同样也越差,设计时应尽量避免选择长细比和宽厚比均较大的构件.In order to investigate the hysteretic behaviors of opening cold-formed thick-walled steel built-up sections under the axial cyclic loading,three cold-formed steel columns were tested which the thickness of the web is 3 mm and 8 mm.On the basis of compared with the test results,a finite element method(FEM)in ANSYS was established.The influence of width-thickness ratio(h/t)rang from 20 to 50 for web and slenderness ratio about the weak axis y(λy)rang from 30 to 90 of such members were investigated by FEM.Analysis results indicated that the ductility of built-up sections member is better than single section member,and the width-thickness ratio and the slenderness ratio about the weak axis y are the most important factors to affect the hysteretic behaviors.So,the cold-formed steels which with great width-thickness ratio(h/t)and great slenderness ratio(λy)should be avoided in designing,because they will lead to poor seismic performance.

关 键 词：冷弯厚壁型钢 组合截面 滞回 宽厚比 长细比 

分 类 号：TU391[建筑科学—结构工程]