Truss Deflection
Truss Deflection
(OP)
A brief overview:
I'm working on a project in which the client wants to move a existing column. The column supports two 100' trusses. I do not want to try and reinforce the existing trusses, so I have designed a new transfer truss to provide support at the column to be removed.
The new transfer truss will deflect, putting additional stress back into the existing trusses. To nullify/minimize this I would like to jack up the column to the calculated deflection prior to attachment, such that a net zero stress is sent back into the existing trusses.
My question is should I include any live load when calculating my deflection to cancel out?
I'm working on a project in which the client wants to move a existing column. The column supports two 100' trusses. I do not want to try and reinforce the existing trusses, so I have designed a new transfer truss to provide support at the column to be removed.
The new transfer truss will deflect, putting additional stress back into the existing trusses. To nullify/minimize this I would like to jack up the column to the calculated deflection prior to attachment, such that a net zero stress is sent back into the existing trusses.
My question is should I include any live load when calculating my deflection to cancel out?






RE: Truss Deflection
Should be pretty straightforward.
Cody
RE: Truss Deflection
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Truss Deflection
Cody, that's is pretty much the exact process I'm using.
KootK, I share your hesitation about using live load in the jacking up deflection calc since its "not really there". However, I'm also trying to keep any induced stress (from the deflection) in the existing trusses below 5 percent, that way I can justify not having to touch/reinforce them.
I am thinking I may jack up the column to eliminate the dead load deflection plus a small amount of the live load deflections such that at no time during construction or after will the induced stress get above 5 percent.
RE: Truss Deflection
RE: Truss Deflection