Finite-Element Modeling of the Nonlinear Behavior of Bolted T-Stub Connections

This paper describes a finite element model for the characterization of the nonlinear behavior of bolted T-stub connections that idealize the tension zone of bolted joints. Two different types of T-stub elements are considered: rolled profiles that are cut along the web, and two plates, flange and web, that are welded in a T shape by means of a continuous fillet weld. The results of existing experimental work are used to calibrate the models. It is found that the numerical approach allows the quantitative actual response to be accurately reproduced. In the case of welded T-stubs, the differences between the numerical model and the experiments are greater due to the effects of residual stresses and modified mechanical properties close to the weld toe, which are not easy to quantify. A parametric study is also undertaken to provide insight into the overall behavior, failure modes, and deformation capacity of the various specimens. A proposal for prediction of failure criteria of these simple connections is also presented and discussed.