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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 study the compressive behavior of cold-formed thin-walled curling channel steel columns with a longitudinal stiffener provided in the middle of the webs, static loading experiments were carried out on 18 specimens with simply supported ends. The experimental results show that the load position and end support conditions have significant influence on the buckling mode and ultimate compressive load of the specimens, while the length of the specimens has significant influence on the buckling modes of the specimens. Due to the presence of web longitudinal stiffeners, Bending thin-walled channel steel column in the negative eccentric (axial line of action is located between the cross-sectional shape of the heart and the web under pressure) higher bearing capacity, and in the forward eccentric (axial force line is located in cross-section Between the heart and curling) under the pressure bearing capacity is lower, the axial compression bearing capacity between the first two cases. The comparison between the experimental results and the analytic solution of the compression-bending members shows that the analytic formula has larger calculation errors for the members with negative eccentricity. Considering the influence of geometrical nonlinearity and material nonlinearity, the finite element software ANSYS was used to simulate the specimen. The results show that the numerical simulation method can predict the bearing capacity and buckling behavior of the specimen well.