BLAST ANALYSIS: DETERMINATION OF EQUIVALENT STATIC LOAD

Abstract eng:
In this paper, we study the blast analysis [1] caused by hydrocarbon explosion. The mount of hydrocarbon is known in advance and the equivalent TNT (trinitrotoluene) explosion is calculated via this knowledge [2,3]. The equivalent TNT explosion will cause the impulsive actions to the structure. The main focus is to study what will be the equivalent static load of the structure. The structural design engineers need this information in order to design properly the structure. If the blast center is relatively far away, usually other design criteria are more determinate. However, the blast analyses have to accomplish in order to confirm the design criteria. In blast analysis [4], the magnitude of the blast pressure and the duration time are important features. Usually, the the blast duration time is very short yielding that the statically equivalent pressure load is considerable lower than the peak pressure of blast wave. This give reason for the reduction factor. The extent of reduction factor depends greatly on the dynamics properties of the structures. The lowest dynamics eigenvalues and theirs time of oscillation affect how large the reduction factor could be. In this paper, we analyze different structures acting on the blast pressure loads by the nonlinear transient analyze methods and define the equivalent static loading in these cases. In many cases the linear structural analysis is enough to reach appropriate results. The design rules how to determinate statically equivalent loads in the blast analyses are suggested.

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