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IBC Chapter 34: 3404

IBC Chapter 34: 3404

IBC Chapter 34: 3404

(OP)
Please read the following from the 2009 IBC, Chapter 34, Section 3404.  It appears to mean that if the P/Pall for a member in an altered structure cannot be more than 10% greater than P/Pall for the unaltered structure.  But this doesn't make any sense to me.

Let say that for a given member in an existing building P/Pall = 0.8.  If that same member has a P/Pall of greater than 0.88, then the member has to be reinforced even though the interaction is less than 1.0.  

Am I reading this wrong?

 

RE: IBC Chapter 34: 3404

Why are you looking at the exception.  If your member complies with chapter 16 (in your example it does because P/Pall<1.0) then no reinforcing is required.  If your member does not comply with chapter 16 then you have a little room (with the exception) before you need reinforcing.

At least this is how I read the section.

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