内置蜂窝芯冷弯薄壁型钢组合墙体受剪性能研究

Study on shear performance of cold-formed steel composite walls with built-in honeycomb sandwich

为研究内置蜂窝芯冷弯薄壁型钢组合墙体的受剪性能,对5片墙体进行了水平低周往复加载试验,并利用有限元软件ABAQUS对该墙体的受剪性能进行了参数分析,研究了导轨处螺钉布置、单个蜂窝的平直段长度以及蜂窝芯板厚度和龙骨厚度等对墙体受剪性能的影响,分析了墙体的传力机制、破坏模式、承载能力、抗剪刚度、滞回特性及耗能能力等。结果表明:内置钢蜂窝芯可以起到较好的蒙皮作用,有效提高组合墙体的受剪承载力和抗剪刚度;立柱截面旋转90°后增强了骨架与面板的相互约束,限制了立柱的扭转与屈曲变形,提升了骨架的抗侧移能力;外覆面板和立柱可以有效约束蜂窝芯板面外屈曲变形,从而提升墙体受剪承载力、抗剪刚度和耗能能力,并改善延性;导轨处螺钉布置及蜂窝芯板和龙骨厚度对墙体受剪性能影响显著,但蜂窝的平直段长度对其影响不大。最后,基于试验和有限元分析结果,拟合了该墙体的受剪承载力计算式,其计算结果与试验值吻合较好。

In order to study the shear performance of honeycomb sandwich cold-formed steel composite walls,five walls were tested under cyclic horizontal loads,and the shear performance of walls was analyzed by ABAQUS.The effects of the screw arrangement at tracks,the straight segment length of a single honeycomb,and the thicknesses of honeycomb sandwich plates and keel on the shear performance of walls were analyzed.The force transmission mechanism,failure modes,bearing capacity,shear stiffness,hysteresis characteristics and energy dissipation capacity of walls were analyzed.The results show that the built-in steel honeycomb sandwich can play a better role as a skin,effectively improving shear bearing capacity and shear stiffness of the composite wall.After the section of studs is rotated by 90°,mutual constraint between skeleton and sheathings can be enhanced,and torsion and buckling deformation of studs can be limited.Consequently,the lateral resistance of the skeleton can be improved.The sheathing of OSB and studs can effectively restrain the buckling deformation of honeycomb sandwich plates,thereby improving the shear bearing capacity,shear stiffness,energy dissipation capacity and ductility of walls.The screw arrangement at tracks and the thicknesses of honeycomb sandwich plates and skeleton have a significant effect on the shear performance of walls.But the straight segment length of honeycomb sandwich has little effect on it.Finally,using test and finite element analysis results,the fitted formula for calculating the shear bearing capacity of the wall was proposed and verified.