Double angle check for flexure and axial load
Double angle check for flexure and axial load
(OP)
I am designing a steel trellis with some custom made L-shaped bent plates. The bent profile i am using is a double L-shaped profile, 5" x 28" x 1" thick, with a 3" space in between.
How do i check the flexural properties of this shape? If one end of this profile is a cantilever piece, i do i check the unbraced length?
Thank you
How do i check the flexural properties of this shape? If one end of this profile is a cantilever piece, i do i check the unbraced length?
Thank you






RE: Double angle check for flexure and axial load
RE: Double angle check for flexure and axial load
Thank you
RE: Double angle check for flexure and axial load
Basically, you're creating a built up WT here. And WT's have abysmal resistance to twist. As you've suggested, you'll want to play close attention to those long cantilevers.
FYI1: bending that 1" plate will be a chore an you're likely to wind up with an outside Ben radius approaching 4".
FYI2: you're span to depth ratio is 96. That's getting out there, even for a lightly loaded trellis member. There could be ice build up and potential for wind flutter.
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: Double angle check for flexure and axial load
How do you calculate the stitch spacing? Would you recommend a full height stitch plate or can i use a small plate at the bottom and one at the top?
Thank you
RE: Double angle check for flexure and axial load
RE: Double angle check for flexure and axial load
Thank you
RE: Double angle check for flexure and axial load
Other than that, you can use the provisions related to local buckling and such for the stem and flanges based on compactness criteria. You could probably apply the overall WT equations, just using modified torsional properties.
There is no way to get a standard section to work? Are you trying to make this 3" gap to accommodate some specific connection?
RE: Double angle check for flexure and axial load