Hysteresis behaviour of an innovative steel beam-to-short stub column connection

In this study, an innovative beam-to-column connection system under cyclic loading is investigated through experimental and analytical approaches. The proposed connection features an H- or I-shaped short stub column (SSC) bolted to both the column flange and a welded end-plate connected to the beam. Web and flange stiffeners are incorporated in both the beam and stub sections to enhance connection stiffness. Key geometric parameters include the stub flange thickness, web thickness and web height. Cyclic tests were conducted on prototype specimens following the AISC 341-16 loading protocol. Experimental results demonstrate that the connection can be effectively constructed using either hot-rolled sections or built-up plate girders. In the latter case, critical dimensions such as flange thickness, web height and flange spacing are determined based on structural performance requirements. The study identifies optimal stub cross-sectional properties through parametric analysis. Complementary finite-element (FE) simulations were performed to validate the analytical model. The FE model was calibrated against experimental data, demonstrating good agreement. A comprehensive parametric study using FE analysis identified key design parameters, leading to the development of practical design recommendations for the proposed connection system.