腹板开槽冷弯薄壁卷边槽钢抗火性能有限元分析模型

位于冷弯薄壁型钢构件腹板的槽孔,可延长构件两边的热量传递路线,减弱冷弯薄壁钢构件作为墙板龙骨引起的冷桥效应。常温下冷弯薄壁构件的屈曲破坏模态已非常复杂,包括整体屈曲、局部屈曲和畸变屈曲等,且不同的屈曲破坏模态可能会相互影响。火灾下冷弯薄壁构件的破坏机理将更为复杂,根据常规的稳定理论难以求解其火灾下的临界荷载。本文利用有限元方法对火灾下腹板开槽冷弯薄壁卷边槽钢的受力性能进行了模拟,研究了单元类型、材料模型、初始几何缺陷以及求解方法等因素对分析结果的影响,为同类构件抗火性能的有限元模拟分析提供了建模依据。

Computational Modeling of Cold-formed Lipped Channels with Slotted Webs for Fire-performance Analysis

Due to the function to prolong the heat transfer route between one side of the member and the other side,the slots in the webs of cold-formed thin-walled steel members can reduce the bridge effect notably.At ambient,the failure modes of cold-formed thin-walled steel members are very complex,including global buckling,local buckling and distortional buckling.Different failure modes can interact on each other.The failure modes of cold-formed thin-walled steel members will be much more complicated in fire.So it’s difficult to get its critical load by using the general stability theory.The authors take use of the finite element method to investigate the mechanical properties of cold-formed thin-walled steel members in fire,taking the factors of element type,material model,initial geometric imperfection magnitude and solution scheme into consideration.At meantime this article offers some advice on the computational modeling of cold-formed thin-walled steel members for fire-performance analysis.