Long span truss chord bracing
Long span truss chord bracing
(OP)
I am working on designing a long span truss. From past experience I have seen most buildings with long span trusses have the roof beams sitting on top of the top chord and bolted into the flange. If I have a W8 chord and am wanting to use the roof beams to brace the chord against buckling for compression (not just compression flange bracing for bending), is attaching to the top flange sufficient? Or would the roof beams have to frame into the web of the truss in order to brace it for compression buckling?
RE: Long span truss chord bracing
RE: Long span truss chord bracing
RE: Long span truss chord bracing
RE: Long span truss chord bracing
1) chord is braced against buckling in the plane of the truss at each truss panel point.
2) chord is braced against torsional buckling at each truss panel point.
3) chord is braced against buckling perpendicular to the plane of the truss at each roof beam.
That's a pretty robust setup as your lowest energy buckling mode is probably constrained axis torsional buckling about the top of the top chord.