Investigations on Simplified High-strength Bolt-slip Numerical Model for Shear Connection

Abstract:

A bolt-slip model was proposed for the simulation of high-strength bolted connections and the method for determining the real constant of nonlinear spring element was also put forward. The reliability of the proposed bolt-slip model was validated and the results were obtained by the proposed model and the refined FE model. The comparison results indicate that the sliding phenomenon can be well captured and the friction force with enough accuracy can be derived by the proposed bolt-slip model. Time for computing reduces by 90% with the same accuracy. In addition， the parametrical analysis was conducted to explore the computational error in different conditions. The influence of pretightening force， thickness of steel plate， bolt diameter and yield strength on accuracy of the proposed bolt-slip model were investigated. Results show that the proposed model is powerful in terms of the convergence and accuracy.