Parallel chord vaulted truss to span 80ft, freespan
Parallel chord vaulted truss to span 80ft, freespan
(OP)
We are going to start work on a shop building for our own needs. Due to local taxes and modular ability, we decided to build an all wood building. We need a parallel chord vaulted truss and plan to design the structures, then have another PE bless and stamp. Trusses is not our line of work.
This looks to be a very common I beam type load with tension compression and the thought came to mind if doubling up a pair of trusses could better protect us on buckling? Anyone with experience with these trusses care to give me some thoughts on a direction to go with this? We are trying to avoid adding steel to the trusses but that is not totally out of the question. We will require design snow down load of 21 psf.
This looks to be a very common I beam type load with tension compression and the thought came to mind if doubling up a pair of trusses could better protect us on buckling? Anyone with experience with these trusses care to give me some thoughts on a direction to go with this? We are trying to avoid adding steel to the trusses but that is not totally out of the question. We will require design snow down load of 21 psf.






RE: Parallel chord vaulted truss to span 80ft, freespan
Dik
RE: Parallel chord vaulted truss to span 80ft, freespan
RE: Parallel chord vaulted truss to span 80ft, freespan
If you really want to design it yourself, get a copy of TPI's publications and get up to speed on the NDS. You will have to determine the stresses in the plates and select plates based on these forces. How the plates are positioned and the grade of the wood also controls the capacity.
Having spent a year redesigning and overseeing repairs on a improperly designed, plate connected wood truss building, I can assure you that having a PE truss designer on the project is the only way to go. Ironically, what took us a year to fix would have been avoided if the owner had hired the engineer who wanted $15k to do an initial design.
RE: Parallel chord vaulted truss to span 80ft, freespan
fastline12,
You are listed as an aerospace engineer. There is a lot of structural engineering involved in the design of aircraft, but those of us who design buildings and bridges would never think of designing something that flies. So why do you want to do this?