摘要
为研究腹板开孔冷弯薄壁卷边槽钢轴压柱的整体稳定性和承载力设计方法,对不同截面的腹板、开圆或矩形孔不同开孔尺寸的冷弯薄壁卷边槽钢柱进行了轴压承载力试验,其中未开孔、开圆孔、开矩形孔试件分别为6,18,18个,每个开孔构件在腹板开孔3个,圆孔直径为0.3、0.5、0.7倍腹板高度,矩形孔高为0.2、0.4、0.6倍腹板高度,孔长为孔高的2倍。试验结果表明:构件宽厚比较小易发生弯扭失稳,而宽厚比较大构件易发生局部屈曲、畸变屈曲和整体屈曲;随着开孔尺寸的增大,腹板发生局部屈曲时荷载提高;与未开孔构件相比,开孔柱的承载力有所降低,且随着开孔尺寸的增大而逐渐降低。采用ABAQUS有限元程序对试件进行了模拟分析,模拟结果与试验结果吻合良好,表明采用有限元分析此类开孔构件是准确和可行的。进而开展了有限元参数分析,对此类构件的弹性整体屈曲临界应力计算式进行修正。
To sutdy the global buckling property of cold-formed thin-walled lipped channel columns with web openings and the calculated method of the overall stability and loading capacity for the compressive columns,based on the effective width method,the tests of axial compression for the cold-formed thin-walled lipped channel columns were conducted,which had different cross sections of webs,circular or rectangular web openings,and opening sizes.There were 6 specimens without openings,18 specimens with circular openings,and 18 specimens with rectangular openings.The diameters of normalized circular openings were 0.3,0.5,and 0.7 times web height.The heights of normalized rectangular openings were 0.3,0.5,and 0.7 times web height.The ratios of length-to-width of rectangular opening were 2.The test results showed that the specimens with smaller ratios of width-to-thickness were prone to flexural-torsional buckling,whlie the specimens with larger ratios of width-to-thickness were controlled by local interaction buckling,distortional and global buckling.The capacity of local buckling increased with the increase of the normalized hole sizes.Compared with the specimens without openings,the ultimate capcity of the specimens with openings decreased slightly.Then the experiments were simulated by finite element software ABAQUS.The simulation results showed good agreement with the test results which indicated the finite element method could analyze the specimens with web openings accurately and feasibly.Furthermore,the formula to predicte the elastic global buckling critical stress was revised based on parameter analysis of specimens with web openings by FEM.
作者
姚行友
尹佳文
郭彦利
YAO Xingyou;YIN Jiawen;GUO Yanli(School of Architecture and Civil Engineering,Nanchang Institute of Technology,Nanchang 330099,China;Jiangxi Province Key Laboratory of Hydraulic and Civil Engineering Infrastructure Security,Nanchang Institute of Technology,Nanchang 330099,China)
出处
《工业建筑》
CSCD
北大核心
2021年第7期113-122,208,共11页
Industrial Construction
基金
国家自然科学基金项目(51868049)
江西省自然科学基金项目(20181BAB206040)
江西省教育厅科学技术研究项目(GJJ180932,GJJ170983)。
关键词
冷弯薄壁型钢
腹板开孔
轴压构件
整体屈曲
相关屈曲
cold-formed thin-walled steel
web opening
axial compressed member
global buckling
interactive buckling
