工程科学与技术2024，Vol.56Issue(4)：88-97,10.DOI:10.12454/j.jsuese.202201073
自攻螺钉与拉铆钉混合连接受剪承载性能试验
Experimental Investigation of the Shear Behavior of the Blind Rivet and Self-tapping Screw Hybrid Connection
摘要
Abstract
This study proposes a hybrid connection of pull rivets and self-tapping screws to address the defects in components connected by self-tapping screws,which are susceptible to pulling and causing severe damage to the structure during seismic activity,and enhance the anti-destruc-tion capability of cold-formed thin-walled steel composite walls activity.This connection aims to mitigate the failure modes of self-tapping screws by analyzing the force transmission mechanism at the interlayer connection of composite walls.In this regard,a total of 48 sets of joint shear per-formance tests are conducted to evaluate the shear resistance of the hybrid connection.These tests include five common thicknesses of connection sheets in cold-formed thin-walled steel structures and a range of lap sheet thickness ratios from 1.0 to 2.0.The methods of connection tested are self-tapping screw connections,pull rivet connections and hybrid connections.Observations from the tests showed that hybrid connections pre-vent the pulling and tearing failures typically seen with self-tapping screws.The failure modes observed are predominantly sheet bearing failure,combined screw tilt failure,rivet shear failure,and partial shear combined with sheet bearing failure.Compared to single connection methods,the hybrid connection'load-displacement curve demonstrates a longer plastic phase.When the thickness ratio exceeds 1.5 and the combined sheet thickness is under 3 mm,the load-carrying capacity and ductility of the hybrid connection increase significantly in comparison to the single con-nections.The calculated bearing capacity of the hybrid connection,using existing calculation methods,was found to be conservative when com-pared to the actual test results.The findings suggest that the hybrid connection can effectively counteract the weaknesses of blind rivets and self-tapping screws under shear stress,improve the resistance to pulling and tearing of self-tapping screws,and thus enhance the bearing capacity and ductility of the connection.Thickness and thickness ratio are key factors that influence the failure mode and bearing capacity of the hybrid con-nection.Furthermore,as the thickness ratio increases,so does the bearing capacity.The method of arrangement has a minimal impact on the mechanical performance and failure mechanism of hybrid connections.Under the experimental conditions of this study,based on the observed failure mode of the hybrid connection,an improved calculation method is proposed.This new method is based on existing calculation methods but provides more accurate results.关键词
拉铆钉连接/拉铆钉-螺钉混合连接/组合墙体/受剪性能/抗剪承载力计算方法Key words
blind-rivet connections/screw-blind hybrid connection/cold-formed steel composite wall/shear behavior/calculation method of shear bearing capacity分类
建筑与水利引用本文复制引用
褚云朋,伏金蓉,钟志豪,陈晓强..自攻螺钉与拉铆钉混合连接受剪承载性能试验[J].工程科学与技术,2024,56(4):88-97,10.基金项目
国家自然科学基金项目(52268029) （52268029）
四川省自然科学基金项目(2023NSFSC0381) （2023NSFSC0381）
