边缘加劲板件有效宽厚比设计方法中的板组效应研究

本文根据能量原理,建立了边缘加劲板件的弹性屈曲理论和卷边槽形截面薄壁构件的板组相关屈曲理论。通过屈曲理论分析,得到了非均匀受压边缘加劲板件的屈曲系数及其反映板组效应的约束系数,并将其引入新修订的《冷弯薄壁型钢结构技术规范》(GB50018)的有效宽厚比设计方法中。本文介绍了50根冷弯薄壁型钢受压构件试验,并按修订后的规范方法进行了试件承载力计算,计算值与试验值比较,偏于安全。将考虑板组效应的有效宽厚比设计方法与国内外现行规范设计方法相比较,具有优越性。

Study on the Plate assembly Effects on Edge stiffened Plate Elements in Design Approach of Effective Width to thickness Ratio

According to the energy principle, the elastic buckling theory of edge stiffened plate elements and the elastic interaction buckling theory of cold formed lipped channel members are established in this paper. An energy method is used to analyze the buckling or interaction buckling behavior of edge stiffened plate elements and members under combined compression and bending. The buckling coefficients and the restrained coefficients considering the plate assembly effects on edge stiffened plate elements are obtained, and the formulae of buckling coefficients and restrained coefficients are adopted in the new Chinese Technical Code for Design of Cold formed Thin wall Steel Structures(GB 50018). Theoretical results are verified by a total of 50 cold formed lipped channel column tests. The experimental load carrying capacity and load carrying capacity calculated by the effective width to thickness ratio method of the new Chinese code have been compared and agreement is found to be good. The effective width to thickness ratio design method considering the plate assembly effects is superior to the relevant design method of American or old Chinese code.