装配式轻钢结构锁铆连接适用性分析

Applicability Investigation of Self-piercing Rivet Used in the Prefabricated Light Steel Structure

为解决传统装配式轻钢结构中自攻螺钉连接工序多、效率低等问题,引入锁铆连接的方式进行构件装配.为研究锁铆连接在冷弯薄壁型钢中的适用性,采用自攻螺钉和锁铆 2 种连接方式分别制作单个接头和桁架梁试件进行试验,以自攻螺钉连接的桁架梁性能为标准,对比分析2类连接试件的破坏模式、抗弯承载力、刚度、延性、变形能力等力学性能. 结果表明:锁铆钉在桁架梁与接头试验中的受力特征有所差异,单个接头试验的结论不足以说明锁铆连接在整体结构中的适用性;锁铆连接桁架梁的破坏模式为延性破坏,表现为上弦杆翼缘板材被拉裂,其抗弯承载力、刚度、延性均优于自攻螺钉连接,且抗弯刚度具有显著优势. 锁铆连接适用于具有较高刚度要求的装配式冷弯薄壁型钢模块.

To solve the problems of many self-drilling screw connection procedures and low efficiency in traditional assembly structure,lock-riveting connection was introduced in this paper.To investigate the feasibility of the self-piercing rivet(SPR)used in the prefabricated light steel structure,single joint and truss beam specimens were manufactured by self-tapping screw and locking-riveting,respectively.The failure modes,bending capacity,stiffness and ductility of the two kinds of connection specimens were compared and analyzed based on the performance of truss beam with the self-tapping screw.Results show that the stress characteristics of lock rivet in truss beam and joint test are different.The conclusion of single joint test is not enough to explain the applicability of lock rivet joint in the whole structure.The failure mode of the truss beam with lock-riveted connection is ductile failure.The upper chord flange plate is cracked.The bending capacity,stiffness and ductility are better than those of the self-tapping screw connection,and the bending stiffness has obvious advantages.The lock riveting connection is suitable for modular cold formed thin-walled steel modularization with high stiffness requirements.