Deformation process numerical analysis of T-stub flanges with pre-loaded bolts

Abstract

A numerical analysis and experimental validation of T-stub steel joint with pre-loaded bolts is done. Design codes have a very imprecise analysis methodology that might not take into account the actual behavior of this joint. The calculations are done with state-of-the-art open source software Code_Aster by taking into account large strains, nonlinear plasticity and contact mechanics. Experimental validation of truss T-stub joint’s ultimate load and displacements shows good agreement with numerical simulation results. Parametric studies show, that the ultimate load and stiffness is highly affected by the pre-loading level of bolts and thickness of flange. By increasing the thickness of flanges up to 40 mm, nearly equal stress distribution in all bolts is obtained. The joint with 70% pre-loaded bolts has around 30% higher ultimate load than the joint with 0% pre-loaded bolts. The design of T-stub flanges can be significantly improved by using state-of-the-art open-source finite element simulation tools.