Numerical Simulation of Anti-Explosion Performance of Reinforced Concrete Slab under Gas Explosion Load
In order to study the dynamic response characteristics of concrete slabs under different gas explosion loads,this paper uses LS-DYNA finite element software to establish a numerical model and verify its reliability based on anti-explosion tests of reinforced concrete slabs in existing literatures.Then,a simplified triangular gas load with different peak values is applied to the concrete slab to study the displacement,velocity and acceleration of the slab under the gas load.The results indicate that the maximum displacement and vibration of the reinforced concrete slab used in the experiment occur at the mid-span position,and they increase with the augmentation of the load peak value;when the peak load exceeds 20 kPa,with the increase of the load value acting on the con-crete slab,the stiffness of the structure is weakened,and the characteristics of the vibration acceleration of the structure will change in the forced vibration stage,resulting in high-frequency oscillation;the initiation time of high-frequency oscillation advances with the increase of peak value of gas explosion load,after the load ends,the concrete plate enters the stage of free vibration,and the vibration period of the plate is affected by the residual stiffness,increasing with the increase of load peak value.
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