Cantilevered Roof Deck Mach 2.0

[jorgen1212]

Does anyone know of a design example for a cantilevered roof deck? Simple beam anaysis does not seem right.
Also, I'm getting bogged down with the span factors for non cantilevered conditions
For example if I have a single span deck
why is the moment calc ( .125 (dl + ll)) L^2 ?

 

[SteelPE]

Last time I checked moments on a uniformly loaded simple beam were calculated as (wL^2)/8. Which can be rewritten as .125wL^2. w would be the dead load and live load added together. So the formula is correct. Do you agree?

 

[structSU10]

I have not seen a calc on this, but vulcraft has a table that recommends maximum cantilever lengths for a non composite roof deck. They say to contact them if there are issues, so maybe contacting the manufacturer will give you more insight.

 

[rb1957]

wow ... that's one fast moving (supersonic) deck !

 

[JLNJ]

See the SDI spec standard section 2.4.A.7 for the cantilever load definitions (which presumably are reflected in the table included in the spec). Not W x L^2/8.