scissor truss horizontal movement requirements
scissor truss horizontal movement requirements
(OP)
If a scissor truss comes back from the fabricator with a requirement for horizontal movement of say 0.5", is it ok to allow the top of the wall to translate out 0.5", assuming that this movement can be accomodated. If this movement occurs is the horizontal reaction then released?






RE: scissor truss horizontal movement requirements
RE: scissor truss horizontal movement requirements
RE: scissor truss horizontal movement requirements
Check the height over deflection ratio and compare it with the allowable movement for various wall construction material.
RE: scissor truss horizontal movement requirements
Connect2
I think I would be careful about allowing a scissor truss to horizontally deflect the top of a wall especially if the wall is masonry. There will be horizontal delection particularly if the truss is light and flexible. To ensure the truss does not spread when loaded it would have to be very stiff and rigid. I think the top of the wall would deflect and then continue to take horizontal force.
If the truss is stiff enough to ensure it will not spread then everything is ok. If things are potentially flexable and causing spread deflections you could consider using a concrete or steel ring beam around on the top of the wall perimeter. This ring beam would support thr horizontal loads from the truss.
Another option would be run a beam under the apex of the trusses which would support the tusses from spreading.
RE: scissor truss horizontal movement requirements
RE: scissor truss horizontal movement requirements
DaveAtkins