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Performance and failure of steel columns under explosion load: numerical research and analysis method

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Document pages: 20 pages

Abstract: The main purpose of this study is to use the dynamic finite element software ABAQUS explicit to simulate the behavior and failure mode of steel columns under explosion load. In this paper, a numerical model is proposed and verified by the published tests of full-scale wide flange steel columns under dynamic explosion load under constant axial pressure. Then, through extensive parameter research, the effects of important parameters on the behavior and failure mode of steel columns under explosion pressure are studied by using the validation model. These parameters include blasting pulse, blasting energy, blasting load, blasting duration, column boundary conditions, column slenderness ratio and blasting direction. summaryrom this parametric study may be used to develop a thorough understanding of the behaviour and failure of steel columns subjected to blast load which, in turn, could lead to a more accurate practical design procedure. The study also presents derivations and validations of a proposed analytical approach to calculate the critical blast impulse at which a steel column losses its global stability. Comparison between the critical impulse-axial force curves obtained from the proposed equation and that extracted from numerical simulations indicates the validity and feasibility of the proposed equation.

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