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Flagpole and grade beam design

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I am designing a patio cover for a client that wants posts at the entryway, but he does not want to use knee braces to resist the lateral forces. I designed a flagpole embeded in the soil, but the embedment depth is 4.5 ' He said that is too much, can I design a 12"x12" grade beam across the front of the entry way with the stl post embeded into the GB. So to do this I must design the GB for axial load and a moment, but I was told that there needs to be a soils report in order to determine the elasticity of the soil.(by code  CBC). Does anyone know if this is true, I can find anything in the code that talkes about this.
Erik Gibbs