Built-up beam column design
Built-up beam column design
(OP)
Does anyone know of a reference for the design of built up sections acting as beam columns? The section I am dealing with is an endpost of a portal frame on a truss bridge and is singly symmetric with single lacing along the bottom.
VOD
VOD






RE: Built-up beam column design
RE: Built-up beam column design
From my familiarity with the CSA S16.1, it does not have formulae for monosymmetric built-up beam-columns. In addition the applied moment is out of plane (weak axis).
Regards
VOD
RE: Built-up beam column design
RE: Built-up beam column design
RE: Built-up beam column design
I usually treat members that are class 2 or 3 as class 4 for biaxial bending. This has been limited to non symmetrical cruciform sections created by splitting a W section and welding it to the flange of another W section, but not at the centreline and to T Sections created by using two W sections with a second, but smaller 'web' plate.
S16 requires that for monosymmetric shapes that a rational approach be used and suggest the Structural Stability Research design guide be used.
I've treated columns as above by using the reduced loadings afforded by Class 4 with the b/t ratios afforded by Class 3 or better (this accommodates local buckling of the section elements) In addition, the intersecting member from a stability point is better than having no member (that's the rational, anyway).
Hope this more detailed explanation helps...
RE: Built-up beam column design
Regards
VOD