PRESSURE-IMPULSE DIAGRAM FOR DAMAGE ASSESSMENT OF STRUCTURAL ELEMENTS SUBJECTED TO BLAST LOADS: A STATE-OF-ART REVIEW

In recent years, explosion incidents due to terrorist attack and accidental explosion have increased worldwide. It has been recognized that assessment of structural elements and buildings under blast loading is very important for protective design. Pressure- impulse (P-I) diagram is an isodamage curve used in the preliminary design of protective structures to establish safe response limits for a given blast loading. With a maximum displacement or damage level defined, P-I curve indicates the combination of load and impulse that will cause the specified failure. This paper presents the state-of-art review on theoretical and numerical methods for developing P-I diagram for structural elements. P-I diagram can be generated from closed form solution for idealized single degree of freedom (SDOF) system of the structural element subjected to a specific loading. Energy balance method is the most widely used method for generating P-I diagram. These methods are simple, but suitable for specific load pulses and structures. For complex geometry or irregular pulse shapes, numerical method has to be resorted. Advantages and suitability of each of the methods are brought out from a critical review.

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