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UBC 1633.2.4

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The code requires that structural framing elements connected to the roof be designed to resist "expected" horizontal displacements of the roof diaphragm so that it will continue to support dead plus live loads when subjected to these deformations . . . this is a delta m deflection number. I am looking at the case of an exterior concrete tilt-up panel building with a flexible plywood diaphragm. Delta m deflections of plywood diaphragms can be large. Out-of-plane Fp loads for design of concrete wall panels can also be large. Is it the intent of the code that wall panels in this case be designed for out-of-plane Fp design forces AND with forces resulting from a delta M displacement of the wall panel at the roof level? What have other people been doing and how do you interpret this portion? The SEAOC Seismic Design Manuals which have examples conveniently stop short of providing any guidance in their examples. As usual they lead you to believe that it is appropriate to take every conservative measure possible, all at the same time.

Your input is appreciated.

Chris Roper, PE

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