Nonlinear dynamic numerical modelling and analysis of concrete panels subjected to blast loads is presented in this paper. Reinforced concrete panels of dimension 1.0 1.0 m and different thicknesses and supported on four sides are subjected to blast loads produced by the detonation of high explosive charges. The modelling and analysis was conducted using ANSYS AUTODYN solver. The accuracy of the model is verified against experimental results of blast load tests on reinforced concrete horizontal slabs subjected to the detonation of high explosive charges above them. The model was capable of simulating the observed damage and displacement with reasonable accuracy. The verified model is used for extensive parametric study to examine the effect of different design parameters on the performance of reinforced concrete slabs under blast loads. The design parameters considered in this study include the effect of concrete compressive strength, panel thickness, reinforcement steel ratio, arrangement of reinforcement steel, and boundary condition on the behaviour of RC panel under blast load. The performance was evaluated in terms of maximum displacement, extent of damage and energy absorbed.
The performance of one-way reinforced concrete walls in resisting blast loads is numerically evaluated in this paper. Reinforced concrete wall strips of dimension 4.0 × 1.0 m and different thicknesses and supported on two sides spanning in the long direction are subjected to blast loads produced by the detonation of high explosive charges. The modelling and analysis was carried out using ANSYS AUTODYN solver. The accuracy of the modelling and its parameters is numerically verified against published experimental results of blast load tests on reinforced concrete slabs. The model was capable of simulating the observed damage and displacement with reasonable accuracy. The verified model is then used for extensive parametric study to examine the effect of different design parameters on the performance of reinforced concrete walls under the effect of blast loads. The design parameters considered in this study include the effect of concrete compressive strength of RC wall, the wall thickness, the reinforcement amount and details, and reflected peak pressure. The wall performance was evaluated considering maximum displacement, extent of damage and energy absorbed within the wall through damage.
Mitigation of the blast risk associated with terrorist attacks and accidental explosions threatening critical infrastructure has become a topic of great interest in the civil engineering community, all over the world. One method of mitigating blast risk is to retrofit vulnerable structures to resist the impulsive effects of blast loading. Masonry is one of the most commonly used materials particular in heritage buildings. An effective way to enhance the ability of unreinforced masonry walls to withstand blast loads and consequently to limit the amount of wall damage is strengthening it with reinforced concrete wall. In this research, the assembly of masonry wall with RC wall jacket from one side is simulated using nonlinear finite element method and ANSYS WORKBENCH V14.5 program to study its behavior under blast loading. A parametric study is performed where the influence of variation of some design parameters on the wall performance under blast effect is studied. The design parameters include masonry wall and RC wall thickness, interface between the two wall layers, stand-off distance, boundary condition, and reinforced concrete compressive strength. The performance of the strengthened walls is evaluated in terms of wall damage, maximum lateral deflection, and end rotation at the support.
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