冷弯薄壁型钢结构受剪性能影响因素研究

Research on Shear Behavior's influence factors of Cold-formed Ultra-thin-wall Steel in Low-rise Residential Structures

采用了有限元法对冷弯薄壁型钢单榀墙架结构的进行受剪性能的分析。建立模型时同时考虑材料和几何非线性,采用弹塑性189梁单元,自攻螺栓采用耦合模型。通过改变已建立的有限元模型中墙架柱间距、墙架高宽比、自攻螺丝间距等影响墙架受剪性能的参数,得出结论:随着墙架柱间距增大、墙架高度增大、自攻螺栓间距增大整个墙架结构的受剪性能明显减小,在有"K"型支撑的高强薄壁型钢墙架结构中,合适的墙架柱间距、合适的墙架尺寸以及支撑体系,对墙架结构的受剪性能有很大的影响。

In this paper, the shear behavior of a new type of high-strength cold-formed ultra-thin-wall steel wall frame was analyzed mainly by the finite element method. In FEM modeling, each thin-wall member was divided by plastic shell elements, the joint couplings at the connection areas were considered for the simulation of real half-rigid connections. The nu- merical analysis of the wall frame models were performed considering material and geometry nonlinear problems simuhaneously. Furthermore, a parametric analysis by FEM was carried out. The influences of different column spaces, different height-width ratios of wall frames and different member connection distances upon the shear capacity of wall frame were discussed. The results indicate that column space, height-width ratio and member connection distances have more evident influences on the shear resistance of wall frame, with the increase of column space, height-width ratio and member connection distance of wall frame, the shear capacity of wall frame was significantly decreased. The proper design of column space, dimensions of a single wall frame and brace scheme could meet the requirement of shear capacity of hlgh-strength ultra-thin-wall steel wall frame.