Experimental and simulation research on structural response under blast load in confined space
TNT explosives will undergo combustion reactions and release a large amount of energy when exploded in confined space.These additional energy will enhance the confined blast load,in order to analyze the dynamic response of the structure under explosive load in the confined space.A confined space explosion test was conducted,and the symmetry of the test data was verified to demonstrate the accuracy and reliability of the pressure test results.Numerical calculations were conducted to investigate the effects of plate thickness,yield stress,and boundary constraints on the dynamic response of the target plate structure.The quasi-static pressure of the numerical calculation and experimental results were in good agreement,and the errors between the initial peak displacement and the final displacement of the target plate center point were less than 5％,proving the reliability of the numerical calculation method.The proportion of initial peak displacement and final dis-placement increase at the center point of the target plate was equivalent to the proportion of plate thickness decrease.The proportion of initial peak displacement reduction at the center point of the target plate was about 0.2 times the proportion of yield stress increase,while the proportion of final displacement reduction was about 0.4 times the proportion of yield stress increase.The numerical calculation method used can effectively simulate the response of the structure under blast load in confined space,providing a certain reference for the design of ship anti explosion structures.
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