Metal R-panels as diaphragm and shear wall

[overdesigned]

Hi all. I am analyzing a barn that was constructed without permit and it appears to be using 26 gauge metal panels for the diaphragm and shear walls. There is no OSB or plywood sheathing and the posts are not embed in caisson footings. When I have designed structures with metal roofing and siding, I always have specified the wood sheathing to act as the diaphragm and shear walls. I also do not know the exact manufacturer of the panels. I only know they are 26 guage R-panels.

Does anyone have any recourses for getting a definitive unit shear value out of these panels? Or if you take the stance that they can not be used for shear, then could you provide some recourses for that conclusion as well? The panels seam pretty thin, but if they do not work, I want to have justification to back that up. Any help is appreciated. Thank you

 

[jayrod12]

There is some literature in the National Post-Frame Design Manual. I think it works out to around 100 plf of capacity on average.

 

[driftLimiter]

AISI 310 can be used to calculate the shear capacity and flexibility of light gage panels. It is not a simple task. Other options are to find manufacturer testing reports. The fastener size and spacing relative to the actual panel widths and lengths comes into account. A well proportioned light gage shear panel is controlled by fastener shear strength in bearing.

 

[XR250]

Wha† jayrod said. I think the 100 plf was for 29ga panels. You should be able to buy a copy of the book.