الملخص الإنجليزي
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.
