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基于箱形截面具有双轴对称、抗弯扭刚度大的特点,提出将冷弯∑形截面两两翼缘相对,并将其卷边焊接形成一种新型冷弯箱形组合截面——DS。应用非线性有限元方法分析新型截面构件在轴压、弯矩及压弯荷载作用时的诸如屈曲模式、承载力、刚度、延性及相关曲线等方面力学性能。同时,还对相同参数的新型截面构件与C形截面构件的单位承载力耗钢量进行比较。分析表明:新型截面构件在承受轴压力时具有高承载力及较高的截面模量,截面加劲充分而使子板件局部屈曲不易出现等力学性能优势。特别适宜承受轴压荷载,同时也适宜承受弯矩和压弯荷载的作用。轴压构件的单位承载力耗钢量一般仅为相同参数C形构件的50%左右,经济效益明显。新型箱形组合构件适于深入试验研究并合理应用于实际工程。
Based on the biaxial symmetry of the box section and the high torsional stiffness, a new cold-formed box-section combination (DS) is proposed, in which the flanges of the cold-formed Σ-shaped sections are opposite to each other and the flanges are welded together. The nonlinear finite element method is used to analyze the mechanical properties such as buckling mode, bearing capacity, stiffness, ductility and related curves of the new section members under axial compression, bending moment and bending load. At the same time, the unit load-carrying capacity of new section members and C-section members with the same parameters are also compared. The analysis shows that the new cross-section members have high bearing capacity and high cross-section modulus when subjected to axial pressure. The cross-section stiffening makes partial buckling of sub-plate parts difficult to occur and other mechanical performance advantages. Particularly suitable for axial compression load, but also suitable for bending moment and bending load effect. The unit load carrying capacity of the axial compression member is generally only about 50% of the C-shaped member with the same parameters, and the economic benefit is obvious. The new box-shaped composite components are suitable for in-depth experimental research and rational application to the actual project.