Both accidental and intentional actions may impose an extreme impulsive load on the beam-column joints of a building. Limited knowledge concerning the behaviour of joints subjected to such loadings has been developed. This study presents a numerical study of steel beam-column connections under impact load. The non-linear finite element software LS-DYNA was employed to develop detailed 3D finite element models. Most common types of beam-to-column connections, named flush plate connection (FPC), partially depth end plate connection (PDEPC), and fin plate connection (FP), are selected to be numerically studied in this thesis. The accuracy of the finite element models is validated against experimental results. Comparison between numerical and published experimental results demonstrate that the models are capable of predicting the dynamic responses of beam-column joints under impact loading with reasonable accuracy in terms of impact load, vertical displacement, and connections deformation mode. A series of parametric studies are conducted for the validated models to extend the study of joints behaviour under impact load. The parameters include effect of number of bolts, plate thickness, impact velocity, and impact energy. Based on the parametric study, the displacement showed a proportional relation with number of bolts and plate thickness, an inverse relation with the impact velocity. Energy balance model between impact energy and absorbed energy was developed, a good result was obtained. It is concluded that the FPC showed higher impact moment resistance than the PDEP and FP. It is found that LS-DYNA is an effective tool to simulate the behavior of beam-column connections under impact load.