ABSTRACT
In the present study, a concrete-filled steel tube (CFST) column is investigated against blast load using three-dimensional non-linear finite element (FE) software ABAQUS/Explicit. The investigated column consists of concrete, modelled using the concrete damage plasticity (CDP) model, outer steel tube and reinforcing steel. Herein, steel is modelled using an elastoplastic material model considering the strain rate effects. Blast load is applied to the columns using the ConWep programme. Detailed parametric analysis is carried out by considering the variation in height of explosion, thickness of steel tube, grade of concrete and reinforcement ratio. Further, the composite column is analysed for three different scaled distances depicting varying blast loading scenarios. Results from this investigation show a reduction in the transverse displacement of the composite column corresponding to parameters such as increasing grade of concrete and reinforcement ratio. Moreover, variation in steel tube thickness and height of explosion is found to be the most predominant parameter for understanding the damage behaviour of the composite column considered in this study.
