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Exposure Categories: ASCE7, IBC

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Where can I find some discussion on the history of the changes to Exposure Category? It seems that each code edition rewrites the exposure categories.


I already have the paper that investigates the effect of fetch on Exposure D and I think I understand why Exposure A went away.


It looks like the ASCE7 definitions have stabilized in the last two editions however I’m not sure I understand why the IBC (and especially the FBC) appear to depart from ASCE7 so dramatically on Exposure B and C.


I don’t really have any specific questions at this point. I’m just stirring the pot to see if anyone has some insight.

Thanks in advance.


Christopher Banbury, PE



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