Elastoplastic analysis of elementary bolted steel tee-stub connections

Elementary bolted steel tee-stub connections proportioned according to EC3 were studied by means of a three dimensional finite element model using the ANSYS software package. The specimens reflect different geometric and strength parameters as well as bolt pre-stressing conditions. Within each specimen, the parameters considered were the flange thickness and the distance between the bolt's line to the end of the flange. The elastoplastic response, up to the ultimate state, was analysed and aspects relative to stiffness, strength, bolt loads, prying forces, interaction between flanges and evolution of the equivalent von Mises stress distribution within the flange and bolt were examined. Comparisons between experimental values and Eurocode3 (EC3) predictions indicate that the design procedure still needs to be improved, owing to the complex phenomena embodied.

► Bolted tee-stub connections were studied with 3D finite element model and ANSYS code.
► Specimens proportioned according to EC3, reflected different geometric parameters.
► Total response, bolt and prying forces as well as stress distribution were examined.
► Discrepancies between 3D finite element results and EC3 model were highlighted.
► Attention should be paid to inherent phenomena if suitable model has to be set up.