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Re: concrete topping on plywood floor sheathing

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Have you considered High Load Diaphrams?   This requires wider supporting joists to be able to nail multiple lines of nails.  I haven't look at these for a while, but it may be possible to obtain shear values up to 1800 plf.   There is an ILegacyO report which will provide you with the values, but I'm not at my office. 

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I presently have some of these diaphragms in a heavy URM building proposal design in order to eliminate a horizontal truss diaphragm arrangement.

Neil Moore, SE, SECB
neil moore and associates
consulting structural engineers
shingles springs, california

distressed structures investigations

At 01:58 PM 1/4/2007, Bruce Holcomb wrote:
I?m looking for design information for concrete topping over plywood floor sheathing, but haven?t found anything.  Typically, I haven?t needed to consider any shear capacity from the topping, but I have a project that I am not getting enough capacity from the plywood and thought I?d explore the shear capacity of the topping.  Can this be done?  Anybody know what computer program to use?  (Just kidding? I mean do you know of any references?)  And how do I get the shear load into / out of the concrete topping?  Thanks!
Bruce D. Holcomb, PE, SE
Vice President & Structural Engineer
Tel: 417.865.6100
Dir: 417.521.6125
Mob: 417.861.9865
Butler, Rosenbury & Partners
Springfield, Missouri
Phoenix, Arizona