An elasto-plastic analytical method including the effect of strain hardning is developed to evaluate the load-deformation relationships for bolted T-stub connections. Tension-elongation relationships of high strength bolts are idealized by a smooth function, moment-deformation relationships of flange are simulated by an elasto-plastic function, and a set of equations based on the equalibrium and compatibility considerations is obtaind for four deformation modes . A series of loading tests is conducted to verify the feasibility of the analysys. The analytical results correlate very well over the entire load history. The tests and the analysis also show that the maximum strength of a T-stub is affected by the stiffness of the plate to which the T-stub is connected.