长细比对轴压下高强拼合冷弯薄壁型钢受力性能影响研究  

Study on influence of slenderness ratio on mechanical properties of high strength assembled cold-formed thin-walled steel under axial compression

作　　者：韩建强 李秋绪 张玉敏 王宇亮 HAN Jianqiang;LI Qiuxu;ZHANG Yumin;WANG Yuliang(Institute of Civil Engineering,North China University of Science and Technology,Tangshan 063210,China;Hebei Key Laboratory of Earthquake Engineering and Disaster Prevention,Tangshan 063210,China)

机构地区：[1]华北理工大学建筑工程学院,唐山063210 [2]河北省地震工程与防灾重点实验室,唐山063210

出　　处：《建筑结构》2024年第22期106-110,共5页Building Structure

基　　金：国家自然科学基金面上项目(51678237);河北省自然科学基金面上项目(E20212091217);河北省教育厅科技重点项目(ZD2020139);河北省优秀专家出国培训项目(201691)。

摘　　要：为研究长细比对轴压下壁厚小于1mm的高强拼合冷弯薄壁型钢力学性能的影响,基于《冷弯薄壁型钢结构技术规范》(GB 50018—2002)设计并制作了壁厚为0.8mm的S550级单肢C形截面立柱和开口双肢组合截面立柱共12根试件。长细比分别为30、40、50、60、70、80,通过控制基本试件尺寸不变,分别改变试件高度进行试验研究。分析结果表明,立柱截面相同时,壁厚为0.8mm的S550级冷弯薄壁型钢试件的轴压承载力随长细比增大呈下降趋势,按照《冷弯薄壁型钢结构技术规范》(GB 50018—2002)中的相关公式计算是偏于安全的;相同长细比条件下,开口双肢组合截面立柱的极限承载力是单肢C形截面立柱的2.03~2.13倍。In order to study the influence of slenderness ratio on the mechanical properties of high-strength assembled cold-formed thin-walled steel with wall thickness less than 1mm under axial compression,a total of 12 specimens of S550 single-limb C-shaped cross-section column and open double-limb combined cross-section column with wall thickness of 0.8mm were designed and manufactured based on the Technical specification for cold-formed thin-walled steel structures(GB 50018—2002).The slenderness ratios were 30,40,50,60,70 and 80 respectively.The height of the specimens was changed respectively for experimental research by controlling the size of the basic specimens.The analysis results show that when the cross section of the column is the same,the axial compression bearing capacity of the S550 cold-formed thin-walled steel specimen with a wall thickness of 0.8mm decreases with the increase of the slenderness ratio,and it is safe to calculate according to the relevant formula in the Technical specification for cold-formed thin-walled steel structures(GB 50018—2002).Under the same slenderness ratio,the ultimate bearing capacity of the open-ended double-limb composite section column is 2.03~2.13 times that of the single-limb C-shaped section column.

关 键 词：高强冷弯薄壁型钢 长细比 拼合截面 力学性能 

分 类 号：TU392.5[建筑科学—结构工程]