高强度环槽铆钉拉-剪力学性能研究  

Investigation of mechanical behaviour of high-strength swage lockbolts subjected to combined tension and shear

作　　者：徐菲 曾文彦 周绪红[1,2] 王宇航 XU Fei;ZENG Wenyan;ZHOU Xuhong;WANG Yuhang(School of Civil Engineering,Chongqing University,Chongqing 400045,China;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Ministry of Education,Chongqing 400045,China)

机构地区：[1]重庆大学土木工程学院,重庆400045 [2]重庆大学山地城镇建设与新技术教育部重点实验室,重庆400045

出　　处：《建筑结构学报》2024年第8期259-270,共12页Journal of Building Structures

基　　金：国家自然科学基金项目(52108116,52221002,52378130);中央高校基本科研业务费2022CDJQY-009。

摘　　要：为研究8.8级和10.9级两种高强度短尾环槽铆钉连接副的拉-剪力学性能,开展环槽铆钉连接副在不同拉-剪耦合作用下的力学性能试验,得到其在不同拉-剪耦合作用下的失效模式、荷载-位移曲线等力学性能;对铆钉断口微观形貌进行电镜扫描,分析不同拉-剪耦合作用下的环槽铆钉连接副的失效机理。研究结果表明:环槽铆钉连接副的失效模式有套环拉脱和铆钉断裂两类,均呈现延性破坏;通过微观层面的断口形貌发现,在不同拉-剪耦合作用下铆钉为准解理断裂,具有一定延性。基于试验结果与理论分析,提出了环槽铆钉连接副在上述两种极限状态下的力学模型,建立了拉-剪耦合承载力设计方法。结果表明,该设计方法能较好地预测试验结果,8.8级与10.9级环槽铆钉承载力计算值与试验值之比分别为0.92和0.97。To investigate the mechanical behaviour of Grade 8.8 and 10.9 high-strength swage lockbolts subjected to combined tension and shear,the mechanical behaviour of swage lockbolts under combined tension and shear was conducted.The mechanical properties of swage lockbolts,including failure modes and load-displacement relationships under various combined tension and shear were obtained experimentally.The underlying failure mechanisms of lockbolts were analyzed based on fractography using scanning electron microscope.The research findings revealed that the swage lockbolt specimens failed at collar pull-out or rivet fracture,exhibiting ductile characteristics.Through the characterizations of the microstructure for the fracture surfaces,it was demonstrated that the swage lockbolts exhibited quasi-cleavage fracture under the combined tension and shear loads,indicating limited ductility.Based on the experimental results and theoretical analysis,the mechanical models of swage lockbolts for these two limit states were proposed,and the design method of swage lockbolts subjected to combined tension and shear was established.The results demonstrate that the proposed design method could offer predictions with satisfactory accuracy,with the strength ratios of calculation value to test value for the Grade 8.8 and 10.9 swage lockbolt being 0.92 and 0.97,respectively.

关 键 词：环槽铆钉 拉-剪耦合 套环失效 铆钉断裂 承载力 设计方法 

分 类 号：TU398[建筑科学—结构工程] TU317.1