Studying the response and behavior of reinforced concrete columns subjected to blast load and confined by CFRP sheets

Abstract

The increased risk associated with the terrorist attack on facilities required increased scientific research on the assessment of the dynamic response of structures that could be exposed to such a risk that could lead to progressive collapse. Contact detonations and suitcase bombs which are placed side by side to columns considered as the fastest and most dangerous works because they target the key- structure element, which is the columns, which in turn will undergo to a large load that leads to the non-linear response to the constituent materials (concrete and steel), An analytical study using FEM method was performed in LS-DYNA program to modeling the reinforced concrete columns subjected to blast load, where the importance of reinforced concrete columns in explosions’ resistance comes from its ability and role in raising the efficiency and strength of structures,After modeling and calibration, to ensure that the real model was accurately simulated, a study was conducted of variables, namely, adding carbon strips (CFRP) with different spacings and thicknesses, in order to know the effect of these variables on the deformation of the reinforced concrete columns and their collapse pattern when exposed to an explosive load, and it was noted that the deformation of the concrete column The armed decreases with the increase in the thickness of the carbon strips, reaching its maximum value in the place where the explosive charge is placed, and it decreases as we move away from the location of the charge, in addition to the fact that the damage area increases as the thickness of the carbon strips decreases. the results showed the efficiency and accuracy of LS-DYNA in simulating, modeling and analyzing of components and structures that maybe exposed to the load.