Abstract

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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

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.