In this webinar, Alessia Casalucci, Ph.D., presents the new ASDSteel1DMaterial recently developed for the OpenSees framework. It is a robust and efficient macroscopic uniaxial material model for simulating the monotonic and cyclic behavior of steel members, incorporating key nonlinear mechanisms such as tensile fracture, bond-slip, and buckling. The model uses a multiscale homogenization strategy, where a representative sub-model with corotational elements and fiber sections captures local buckling effects. The webinar focuses on how to define the material parameters and apply the model in structural simulations under complex loading conditions. Selected numerical examples will be presented to illustrate the model’s capabilities and practical uses.