钢结构用自锁式单向螺栓抗拉刚度分析模型-《建筑科学与工程学报》

文章信息/Info

Title:: Analysis Model of Tensile Stiffness of Self-lock One-side Bolt for Steel Structure

Author(s):: LI Guo-qiang, ZHANG Jie-hua; State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University

摘要:: 对8.8级和10.9级的M16和M20共4种型号的国产单向螺栓STUCK-BOM进行了轴向拉伸试验，每种型号的单向螺栓采用3种不同厚度连接钢板进行轴向拉伸，得出了各组试验单向螺栓轴向抗拉刚度；对单向螺栓的轴向拉伸过程进行了理论分析，通过理论推导得出了3种轴向变形的理论计算公式，并由此得出了单向螺栓轴向抗拉刚度的理论计算公式；将单向螺栓轴向抗拉刚度理论值与试验值进行比较。结果表明：单向螺栓轴向拉伸存在单向螺栓拔出破坏和单向螺栓螺杆拉断破坏2种破坏模式；单向螺栓的轴向变形可分为螺杆轴向变形、套筒轴向变形以及套筒与锥头间滑移的轴向分量3个部分，其中套筒与锥头间滑移的轴向分量对轴向抗拉刚度起控制作用；单向螺栓轴向抗拉刚度理论值与试验值吻合较好，单向螺栓轴向拉伸理论分析模型具有较好的可靠性。

Abstract:: Axial tensile tests were conducted for 4 types of domestic one-side bolt STUCK-BOM of M16 and M20 in 8.8 and 10.9 levels. The axial tension test of each type of one-side bolt was carried out with 3 different thickness connecting steel plates. The axial tensile stiffness of the one-side bolt in each test was obtained. The axial tension process of one-side bolt was theoretically analyzed. Three theoretical formulas for axial deformation were obtained through theoretical deduction, and the theoretical formula for axial tensile stiffness of one-side bolt was obtained. The theoretical and experimental values of axial tensile stiffness of one-side bolt were compared. The results show that there are 2 failure modes of one-side bolt in axial tension, including pull-out failure and screw breaking failure. The axial deformation of one-side bolt can be divided into 3 parts, including axial deformation of screw, axial deformation of sleeve and axial component of slip between sleeve and cone head. The axial component of slip between sleeve and the cone head has a control effect on the axial tensile stiffness. The theoretical value of axial tensile stiffness of one-side bolt is in good agreement with the test value, and the theoretical analysis model of axial tension has good reliability.