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ponding

ponding

(OP)
Hi

AISC has two design procedures for ponding.  One is for a case where there are flexible primary and secondary members.  The other is for when there are flexible secondary members bearing on a wall (infinitely stiff primary member: Cp=0)

What happens if you have roof joists bearing on a flexible joist girder at one end and a concrete wall panel at the other end?  Let's say the water is going to pond at the concrete wall.  Do I follow the procedure that assumes the primary member is infinitely stiff?  Or do I maybe assume the primary member stiffness (Cp) is an average of the joist girder stiffness (Cp=x) and the wall (Cp=0)...i.e. Cp=x/2.  

Thanks.

RE: ponding

I'd do your latter suggestion - run both analyses and know that you fall between them somewhere, probably half-way.

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