Sloped Roof Framing Design
Sloped Roof Framing Design
(OP)
Trying to find design approaches taken for sloped roof steel rafters (W shape, with W shape structural ridge) under dead, live, and wind loads? I'm considering just using a horizontal projection of all the loads and applying to the horizontal projection of span length to determine moments and shears. Also, does thrust need to be considered on the horizontal walls (gable type roof, with no "ceiling joists"), or is it usual to neglect the thrust in design. Does anyone have a reference recommendation that discusses this matter further.
Thanks
Thanks






RE: Sloped Roof Framing Design
For wind loads, the codes dictate that they are to be applied normal to the slope...thus, you use the full sloped length of the beam for your span in determining shears and moments.
The lateral thrust, for a beam supported by vertical supports is zero for gravity. But if your support is another sloping member (like at a roof ridge) there will be a thrust and you must consider it.
RE: Sloped Roof Framing Design
Do you have ties?
RE: Sloped Roof Framing Design
RE: Sloped Roof Framing Design
RE: Sloped Roof Framing Design
You still of course need a diphragm, bracing, etc. for lateral loads.