中文摘要：

将锁铆连接引入冷弯薄壁型钢结构构件问的连接中，考虑了铆钉端距、间距、数量、排列方式等因素，对锁铆连接的受剪性能进行试验，研究了各试件的荷载一变形曲线、受剪承载力及破坏模式。基于传染病传播动力学SIR模型，建立了单颗锁铆连接力学模型，并考虑铆钉群折减效应提出了多颗锁铆连接的受剪承载力计算方法。研究结果表明：多颗锁铆连接的破坏主要为铆钉腿部剥离下层板材并伴随铆钉头部脱离上层板材、钢板净截面拉断，其中前者为较理想的延性破坏模式；铆钉排列方式、端距和间距对锁铆连接的受剪性能影响较大，铆钉应优先纵向排列，端距、间距不宜小于3倍与5倍铆钉直径；考虑铆钉群折减效应的受剪承载力计算方法具有较高的预测精度。

英文摘要：

To introduce self-piercing rivet （SPR） connections into component connection of cold-formed thin-walled steel structure, SPR connection specimens were tested on shear behavior, which took into account the factors including end distance, spacing, number and arrangement of SPRs. The load-deformation curve, shear bearing capacity and failure mechanism for all test specimens were studied. Based on the SIR （ susceptible-infective-removal ） model of transmission dynamics of infectious diseases, mechanical model of single SPR connection was established. A calculation method of the shear bearing capacity was proposed for multiple SPR connections by considering rivet group reduction effect. The results show failure of multiple self-piercing rivet connections mainly include pull-out of rivet tail from the bottom sheet along with pull-over of top sheet from rivet head, tensile fracture of steel sheet, in which the former is ideal ductile failure mode. End distance and spacing of rivet are key factors for influencing failure mechanism and shear behavior of SPR connections, which should not be less than 3 times and 5 times diameter of rivet, respectively. Arrangement has a great influence on the shear bearing capacity, so rivet should firstly consider vertical alignment. The calculation method considering rivet group reduction effect can accurately predict shear bearing capacity of SPR connections