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The aim is to work out a tri-dimensional code calculating the overpressure distribution on any structure when an air shock wave arrives specially in the case of geometry providing multiples waves reflection. The computer code ZEPHIR was written with the assumption that the phenomena agrees with the acoustic laws. An integral formulation leads infinite tri-dimensional problems to a bidimensional one on a surface S limiting the real D. The surface S is discretized with triangular elements and replaced by the polyedre constituted by the mesh. The pressure is calculated at the gravity center of the triangular elements with interpolation between several time steps.