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Re: Blast Pressure

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The  47 sec. blast pressure pulse should be treated as a dynamic problem that
depends upon the shape of the pulse.  The  dynamic analysis problem could be
simplified  to some extent if your sponsor could provide you with the shock
spectra for the pulse.   

The load factor on your 533 psi will be greater than one, and in the limit,
could theoretically be as high as 2.0. If you do not want to go into the
dynamic analysis, which could become moderately lengthy, use the shock spectra
( you will have to have some idea of the natural frequency of  at least the
first mode of the tower)  or else  be ultra-conservative and design for an
equivalent static blast  load of  2*533 psi.