Beam-column element for non-linear dynamic analysis of steel members subjected to blast loading

This paper addresses an innovative semi-analytical non-discretisation numerical methodology for the non-linear dynamic analysis of steel beam-column elements subjected to loading produced by an explosion. For the mechanical-based formulation, the steel beam-column member is modelled as being restrained at its ends by translational and counterpart rotational springs which simulate semi-rigid joints in a frame. The modelling of the cross-section as comprising of elastic and inelastic domains allows for the spread of yielding to be modelled accurately, whilst the effects of large displacements and the rate-dependent effect of steel material due to rapid dynamic loading is taken into account. The generic steel beam-column element that is developed is shown to agree well with solutions given by finite element modelling using ABAQUS, while providing a computationally superior formulation to that of commercial finite element packages. In addition, it provides a more efficacious formulation to those of conventional plastic zone and plastic hinge methods, while it has the potential to be used as a platform for structural analysis and design in which scenarios of progressive collapse are important.