I recognize that the grout tube diameter was used but in the final condition it would be grouted. Taking that larger diameter into account before grouting is prudent.
Best I have for a reference is other than the original paper AASHTO...
Peter.
I modified the post upthread to accurately reflect slope.
In any event we have no idea if diagonal #11 had 1% or 3% steel.
And yes about 2000 kips is correct for the equation you used.
But let's talk about AASHTO equations. ø = 0.75, a realistic Aps of 1.75" dia rods & fpu = 150 ksi...
Peter Dow is accurate with the equation with the design axial force.
Diagonal #11 has a slope of about 1v:1.38h based on the prelim drawings. This results in an unfactored dead load force = 1619 kips based on the truss end reaction of 950 kips.
Columns that fail when tested to failure break...
