冷弯薄壁不锈钢拼合箱形截面短柱轴压试验研究  

Experiment of Cold-Formed Thin-Walled Stainless Steel Built-up Box Section Stub Columns Under Axial Compression

作　　者：靳春驰 李海汀 段立平 张佳慧 JIN Chunchi;LI Haiting;DUAN Liping;ZHANG Jiahui(School of Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure,Shanghai Jiao Tong University,Shanghai 200240,China;School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海交通大学上海市公共建筑和基础设施数字化运维重点实验室,上海200240 [3]上海理工大学环境与建筑学院,上海200093

出　　处：《建筑钢结构进展》2025年第4期14-23,共10页Progress in Steel Building Structures

基　　金：国家自然科学基金(52378166、52008243、52178147)。

摘　　要：为研究冷弯薄壁不锈钢拼合箱形截面短柱的受力性能,对14根拼合箱形截面短柱、6根单肢U形或C形截面短柱及5根腹板开孔拼合截面短柱进行了轴压试验研究,试件材料为S30408奥氏体不锈钢。通过试验得到了不锈钢材料的力学性能指标和轴压试件的极限承载力、荷载-位移曲线,分析了试件的屈曲模式和破坏特征。试验结果表明:试件拼合方式对其极限承载力有显著影响,其中CC截面试件承载力最大,UU截面试件承载力最小;UU截面拼合箱形截面柱的极限承载力大于单肢组成构件的承载力之和;当腹板开孔率小于0.5时,试件极限承载力几乎无削弱。将美国规范ASCE/SEI8-22现有计算方法与试验结果进行了对比,试验值低于计算方法的计算值,ASCE/SEI 8-22规范方法不能直接用于计算冷弯薄壁不锈钢拼合箱形截面轴压短柱承载力。In order to study the behavior of cold-formed thin-walled stainless steel built-up box section stub columns,a total of 25 fixed-ended stub columns including 14 built-up section specimens without holes,6 unstiffened channel or edge-stiffened channel section specimens and 5 built-up section specimens with circular web holes were tested under axial compression.The material of specimens was S30408 austenitic stainless steel.The experimental results involving failure modes,ultimate capacities and responses of load versus axial shortening were obtained and fully documented.The experimental results show that the type of built-up section has a significant effect on the ultimate bearing capacity of the built-up section column,in which the test specimens of CC-section and UU-section exhibit the largest and smallest bearing capacity respectively.The ultimate bearing capacity of built-up UU-section specimens is larger than the sum of the bearing capacity of the single channel section specimens.The holes on the web have almost no weakening effect on the ultimate bearing capacity of the specimens when the hole diameter-to-web height ratio is less than 0.5.The test results were compared with predictions calculated by the design method as per the current American Specification ASCE/SEI 8-22.It is found that the test strengths were lower than the predicted values,indicating that the current codified provision in ASCE/SEI 8-22 is not applicable to be directly used for ultimate bearing capacity predictions of the cold-formed thin-walled stainless steel built-up box section stub columns.

关 键 词：不锈钢 冷弯薄壁型钢 拼合截面柱 试验研究 直接强度法 

分 类 号：TU391[建筑科学—结构工程]