IBC Simplified Wind Load Application

If you are designing a spandrel beam, you wouldn't use the Main Wind Force Wind loads but rather the components and cladding wind loads. The simplified provisions (I think) are MWFRS wind.

Thanks for the reply. I still would like to know if there is a way to apportion the leeward and windward parts of the load to the MWFRS. In the old SBC and even in ASCE 7, Section 6, the windward and leeward apportionment is addressed(usually .8 x windward and .5 x leeward of a certain basic wind pressure), but since we are given the total in IBC I thought it would be something like .8/1.3 for windward and .5/1.3 for leeward (61.5% and 38.5% respectively). I just didn't see anything in the code.

I don't think their is a straight answer to your question. Most of the time I use the analytical procedure because my buildings are not simple. What I do know is that generally when the simple procedures are used then their is generally simplified analysis to go with it. Thus the wall load is generally loaded onto the windward column or even resolved into a point load at the eave for analysis. For individual components you can use Table 1609.6.2 (Components and Cladding). This table gives you positive and negative pressures to design with. The wind loads are based on 3 second gust. The conversion table is so that you can convert to fastest mile if required.