pre-engineered metal trusses
pre-engineered metal trusses
(OP)
How much design and information must be provided on roof plans for a pre-engineered metal trusses. Does anyone have a checklist of minimum items that are required for the truss designer to carry on his work? As EOR, I requested signed and sealed plans and calculations.
Regards
Regards






RE: pre-engineered metal trusses
Additionally, I make the truss designer responsible for all light gage bridging, framed openings, eave blocking, holdowns, connections, etc.
RE: pre-engineered metal trusses
I am being challenged as asked to do virtually the entire design. I think it is absurd.
Regards
RE: pre-engineered metal trusses
Use the suggested specification as recommended by the light gage metal truss manufacturers. The one that Alpine (Trusteel) has on their website defines who's responsibility it is to design the trusses. It is the manufacturer that specifically designs the components and connections of the trusses, not the building EOR. Each manufacturer has different chord and web sections used for the design. It is the building EOR that specifies the loads for the manufacturer's truss designer to follow.
Any of the light gage metal truss manufacturers can explain the normal design procedure to your client.
RE: pre-engineered metal trusses
Thanks.
RE: pre-engineered metal trusses
RE: pre-engineered metal trusses
I provided the load criteria dead load, live load and the wind load criteria (although, I am attaching a wind pressure table and diagram on my plans for the entire roof and wall zones that are in the ASCE 7).
Client is asking my office to design fascia, trusses, their connections, bridging, etc.
RE: pre-engineered metal trusses
I am sure he doesn't understand when you tell him 'usually' we do not design them. If he still insists on you doing it, then I would figure the time required and charge for it, which I am sure would be a lot more time than the specialty engineer would charge.
RE: pre-engineered metal trusses
Regards
Ayman
RE: pre-engineered metal trusses
RE: pre-engineered metal trusses
2. Provide designer with the lateral loads and show how you would like to connect the truss to the support (welding, screws, etc.). Leave the connection up to the designer because of proprietary shapes of truss members.
3. Spread trusses out to make a more economical design. Use metal roof deck or do a detail design of the wood sheathing.
4. Don't use metal trusses unless required for fire rating, span conditions, or economics (wood trusses are usually less expensive in my area; I don't know if this is true in all areas).