Abstract: During the vibration of the transmission tower， the bolt joints will move back and forth， but there is still a lack of research on the dynamic characteristics of the bolt joints. The numerical simulation of joint bolt slip is carried out to analyze its hysteresis performance under cyclic loading. The effects of initial clearance， bolt torque， and contact surface roughness on the hysteresis performance of typical bolt joints are studied through parameter analysis， which provides a reference hysteretic model for simulating the dynamic response of bolt slip. The results show that the smaller the initial clearance， the larger the coefficient of the friction， the greater the initial torque， and the smaller the limit deformation of the hysteresis curve， in which the initial gap has the greatest effect on the slip deformation.

Key words: bolt slip, transmission tower, cyclic load, dynamic characteristics, numerieal simulation