Study on load distributing function of square slab surface under close-in blast loading

The mode and magnitude of the blast load are the main cause of damage to the structure. Most current studies have simplified the blast load into a bilinear form that differs greatly from the actual time history curve and is applied directly to the structure, avoiding the fluid-solid coupling interaction between the gas and the structure. The simplied blast load for near-explosion or internal explosion will bring a big error to the calculation results. In order to quickly determine the load on the surface of the square plate under near-explosion, the interaction between the explosion shock wave and the structure is studied by numerical simulation method. The distribution function of the explosion load at different points on the surface of the square plate structure is proposed, and the plate structure is established to simplify prediction formulas for blast load parameters at the center of the surface. Using these formulas, a general method for constructing blast loads at any point on the surface of a structure is proposed. The results show that using these formulas, it is possible to predict the parameters (peak pressure and impulse) of the blast load that an structural member of any size can withstand in a near-explosive environment.