新型冷弯翼缘闭合组合构件压弯力学性能

Mechanical Behavior of New Kinds of Cold-Formed Flange-Closed Composite Section Members under Compression-Bend Loads

目的分析冷弯翼缘闭合截面(DHF1、DHF2)构件在压弯荷载作用下的力学性能.方法采用非线性有限元数值方法,应用大型有限元通用程序ANSYS对新型截面构件的力学性能进行模拟.结果分析了新型截面构件在压弯荷载作用下的屈曲模式、变形特征、承载力、刚度等方面力学性能,新型冷弯截面构件具有截面平均应力高、相关曲线饱满、构件刚度大、弯曲变形小,板件不易局部屈曲等方面力学性能优势,DHF1、DHF2构件的单位承载力耗钢量最低分别为同截面参数C形构件的46.0%和44.2%.结论所提出的新型冷弯翼缘闭合构件相关曲线饱满,适宜承受压弯荷载,并且具有多方面优良的力学性能,可以深入研究并合理推广使用.

Based on the hollow flange beam（HFB） of Australia,the two new kinds of cold-formed flangeclosed sections are put forward in the paper. And the mechanical behavior of the two new kinds of section members under compression-bend load has been studied. The nonlinear finite element method has been adopted and the large scale of general FEA program ANSYS has been used to simulate the new section member＇s mechanical behavior. Based on the precise finite element model, nonlinear finite element method is adopted to study the static behaviors including buckling modes ,deformed process, load carrying capacity and stiffness of two new kinds of section members under compression-bend loads. The two new kinds of section members have some superior static behaviors including higher mean section stress and correlation curves replete and modulus of the member and have no local buckling phenomena in the elements are proofed. DHF1 and DHF2 section members the lowest consumed steel quantities of per unit load carrying capacity are only about 46.0% and 44.2% comparing with the same dimensions of C-section members, which show the outstanding economic properties. The two new kinds of section members shows many sides of superior mechanical behaviors, and suitable for support compression-bend loads as well. These two new kinds of section mem- bers can go deep into the experiment study as to be used in the practical engineering.