In order to study the dynamic response process of concrete slab under blast load,the influence of different parameters on the failure characteristics and dynamic response of concrete slab is analyzed.In this paper,a finite element model of fluid-structure interaction is established by using LS-DYNA software combined with arbitrary Lagranginan Eulerian-finite element model-smoothed particle hydrodynamics(ALE-FEM-SPH)algorithm.Based on the combined influence of tensile compression and maximum principal strain,a correction method for the failure criterion of concrete elements is proposed,and the influence of different explosion proportional distances,concrete strength,reinforcement strength and reinforcement ratio on the failure characteristics and dynamic response of concrete slabs is analyzed through numerical simulation.A prediction model of the peak displacement in the plate span considering the influence of multiple factors is obtained.The results show that as the proportional distance decreases from 0.538 m/kg1/3 to 0.315 m/kg1/3,the peak displacement in the middle span of the plate increases by 177.98%,and the failure degree of the plate is aggravated.According to the results of the orthogonal test range analysis,the proportional distance,reinforcement ratio,concrete compressive strength and reinforcement strength range are 0.31,0.11,0.07 and 0.04,respectively,so the most important factor affecting the peak displacement in the slab span is the proportional distance.
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