腹板加强型冷弯薄壁卷边槽钢柱受压性能试验研究  

Experimental investigation of web-stiffened cold-formed lipped channel columns

作　　者：陈明[1,2] 周绪红[1,3] 刘占科[1] 何子奇[3] CHEN Ming ZHOU Xuhong LIU Zhanke HE Ziqi(School of Civil Engineering and Mechanics, Lanzhou University, Lanzhou 730000, China School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China School of Civil Engineering, Chongqing University, Chongqing 400045, China)

机构地区：[1]兰州大学土木工程与力学学院,甘肃兰州730000 [2]兰州理工大学土木工程学院,甘肃兰州730050 [3]重庆大学土木工程学院,重庆400045

出　　处：《建筑结构学报》2017年第2期37-47,共11页Journal of Building Structures

基　　金：国家自然科学基金项目(50978128,51608245);甘肃省自然科学基金项目(148RJZA011)

摘　　要：为研究腹板中间设置有一道纵向加劲肋的冷弯薄壁卷边槽钢柱的受压性能,对18根两端简支试件进行了静力加载试验研究。试验结果表明:荷载作用位置、端部支承条件对试件的屈曲模式及受压极限荷载影响显著;而试件长度仅对试件屈曲模式的影响显著;由于腹板纵向加劲肋的存在,冷弯薄壁卷边槽钢柱在负向偏心(轴向力作用线位于截面形心与腹板之间)压力作用下承载力较高,而在正向偏心(轴向力作用线位于截面形心与卷边之间)压力作用下承载力较低,轴心受压承载力介于前两种情况之间。通过试验结果与压弯构件解析解计算结果的对比发现,解析式对于负向偏心受压构件的计算误差较大。考虑几何非线性和材料非线性的影响,采用有限元软件ANSYS对试件进行了数值模拟分析,分析结果表明,采用数值模拟方法可以很好地预测试件的承载力和屈曲行为。In order to investigate the compression behavior of the cold-formed lipped channel column with an intermediate longitudinal stiffener on the web,a total of 18 specimens with pinned-ended conditions were tested statically.It is shown that both the loading position and the end supporting condition have significant effects on the buckling modes and the ultimate bearing capacities of the specimens,while the column length only has observable influence on the buckling mode. Due to the presence of the web-stiffener,the column performs generally higher ultimate strength under negative load eccentricity conditions compared with the positive load eccentricity conditions,while the ultimate strength of the column under axial compression performs just between results under the two former conditions. Through comparison between the test results and the closed-form solution results proposed for beam-columns,it is found that the closed-form solution for beam-columns may not be appropriate for the negative load eccentricity conditions.Furthermore,the tested specimens were also numerically investigated by finite element program of ANSYS. Geometric and material nonlinearities were included in the finite element models of the columns. It is demonstrated that the numerical analysis can closely predict the ultimate strength and the buckling behavior of the tested columns.

关 键 词：腹板加强型冷弯薄壁卷边槽钢柱 静力试验 承载力 畸变屈曲 

分 类 号：TU392.1[建筑科学—结构工程] TU317.1