Due to the impact load,the bolted joint structure shows obvious nonlinear hysteresis phenomenon,which will affect the overall connectivity of the structure.Traditional dynamic research only considers the micro/macro slippage of the joint,and rarely studies the pinning force caused by the collision between the bolt rod and the hole wall.Based on the BRAKE’s RIPP model,a new“pinning contact force” model considering energy loss was proposed,so as to realize the modeling of the overall hysteresis loops of the three stages of tangential force.The influence of preload and friction coefficient on hysteresis loop was analyzed based on this model.The proposed model is in good agreement with existing research results,verifying the validity of the overall hysteresis model.The result shows that the increase in friction and preload will expand the area enclosed by the hysteresis loop,leading to a gradual increase in energy loss caused by tangential slip within a single cycle.Compared to the friction coefficient,the preload has a more significant impact on the hysteresis characteristics of the micro slip stage.The proposed model can reflect the influence of “pinning” contact process on hysteresis characteristics,help to better reveal the response characteristics and nonlinear behavior of bolted joints under impact load,and provide help for the subsequent dynamic modeling of bolted joints.