楔形压弯构件平面内稳定极限承载力研究

Research on Ultimate Load-carrying Capacity In-plane of Tapered Member

楔形变截面H型钢构件设计中常采用高而薄的腹板,这样能够充分发挥翼缘的承载能力,节省材料。如此虽然可能引起腹板的局部屈曲,但板件的屈曲并不意味着构件承载能力的丧失。应用非线性板壳有限元分析方法,对变截面压弯构件平面内稳定极限承载力进行了分析。在考虑腹板局部屈曲和构件整体屈曲相关作用的同时,系统地分析与评价了腹板宽厚比、翼缘宽厚比、构件长细比和楔率等对压弯构件平面内稳定极限承载力的影响,并与《门式刚架轻型房屋钢结构技术规程》(CECS102:2002)的计算结果进行了比较,结论可供工程设计参考。

For tapered H-section members, thin and high webs are adopted, and the design fully develops flange beating capacity and save materials. This kind of design method can lead to local buckling of web , but this doesn＇ t mean to lose beating capacity. Based on the non-linear shell element method, analysis for ultimate load-carrying capacity of tapered Hsection column in-plane is carried out. Considering the interaction of web local buckling and overall buckling of member, the effects of web width to thickness ratio, flange width to thickness ratio, slenderness ratio of member and web tapering ratio on ultimate load-carrying capacity of column are analyzed and evaluated. After comparing the analysis results of non-linear finite element method with those of current Technical Specification for Steel Structure of Light-weight Buildings with Gabled Frames, some valuable conclusions are consulted.