基于锁铆连接的冷弯薄壁型钢开洞组合墙体抗震性能试验研究

Experimental Study of Seismic Behavior of Cold-formed Thin-walled Steel Shear Walls Using Self-piercing Rivets With Openings

为研究基于锁铆连接的冷弯薄壁型钢开洞组合墙体的抗震性能,对8面2.7 m×2.4 m(高×宽)足尺冷弯薄壁型钢组合墙体进行水平单调和低周往复加载试验,分析加载方式、墙体开洞尺寸等因素对组合墙体的破坏特征以及抗剪承载力、刚度、延性、耗能等性能指标的影响规律.研究结果表明:基于锁铆连接的开洞组合墙体在单调加载下的抗剪承载力高于低周往复加载的抗剪承载力,但随着开洞尺寸的增大,加载方式对抗剪承载力的影响减弱;墙体的破坏主要发生在试件的角部以及开洞口两侧;墙体的延性系数为1.67~3.36;耗能系数为0.60~0.73;随着墙体洞口尺寸的增加,延性增加,墙体刚度和承载力降低.

To study the seismic behavior of the cold-formed thin-walled steel shear walls of using self-piercing rivets with openings,8 full scale of 3 m×2.4 m(height by width)specimens were tested under monotonic loading and cyclic loading,respectively.Factors that influence the seismic behavior of cold-formed steel stud walls including loading pattern and opening ratio were studied,and the failure mechanism bearing capacity stiffness ductility and energy dissipation coefficient of specimens were obtained.Results show the shear resistance of the cold-formed thin-walled steel shear walls of using self-piercing rivets with openings under monotonic loading is higher than that of the low-cycle reciprocating loading.However,with increasing the size of the hole,the influence of the loading method of the shear resistance is weakened.The damage of the wall specimen mainly occurs at the corner of the wall and both sides of the opening.The ductility coefficient of the wall is between 1.67 and 3.36;the coefficient of energy dissipation is between 0.60-0.73.With increasing the wall hole size,the ductility increases,and the wall lateral stiffness and the bearing capacity decrease.