冷弯薄壁型钢组合墙体抗剪性能试验研究

Experimental study of the shear resistance of cold-formed steel stud walls

对7块3m×2.4m(高×宽)冷弯薄壁型钢组合墙体足尺试件进行水平单调和低周反复加载试验,研究了墙面板材料、加载方式以及墙体开洞口等因素对冷弯薄壁型钢组合墙体抗剪性能的影响,得到了各类组合墙体的破坏特征、承载能力、刚度、延性以及耗能系数等。试验结果表明:墙面板材料性能对冷弯薄壁型钢组合墙体的抗剪承载力影响较大,单面硅酸钙板(CSB板)组合墙体的抗剪承载力约为单面定向刨花板(OSB板)组合墙体的1.3倍,但延性不及单面OSB板组合墙体;加载方式对组合墙体的抗剪承载力影响明显,单调加载组合墙体的抗剪承载力比低周反复加载组合墙体的高约13%;墙体开洞大小影响组合墙体的抗剪承载力,当构造相同时,墙体开洞率越大,墙体抗剪承载力越小。

In order to investigate the shear resistance of cold-formed steel stud walls,seven full-scale 3m×2.4m（height by width）specimens were tested under monotonic loading and cyclic loading,respectively.Factors that influence the shear resistance of cold-formed steel stud walls,including material behavior of sheathing,loading pattern and opening ratio,were studied,and the failure mechanism,bearing capacity,stiffness,ductility and energy dissipation coefficient of specimens were obtained.Experimental results show that the material behavior of sheathings greatly influences the shear resistance of the walls.The shear resistance of the single calcium silicate board（CSB） wall is about 1.3 times that of the single oriental strand board（OSB） wall,while the ductility of the single CSB wall is lower than that of the single OSB wall.Loading pattern also exerts significant influence,in that the shear resistance of the specimen under monotonic loading was higher 13% than that of the specimen under cyclic loading.When all specimens have the same configuration,the shear resistance decreases with the increase of the opening ratio.