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GLB - Need help with radius GLB thrust calcs
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- Subject: GLB - Need help with radius GLB thrust calcs
- From: "Dennis S. Wish" <wish(--nospam--at)cwia.com>
- Date: Sat, 4 Apr 1998 22:26:12 -0800
This should be elementary, but I am having trouble getting my templates to match the example in the AITC 4th edition Table 5.20. I am simply trying to determin the Summary of Dead Load Moments taken at each 10th point on the radius beam. Unfortunately the AITC manual does not provide a sample of the Ms calculation for dead loads. I can only assume it is the reaction times the distance to the point the moment is being calculated minus the distributed dead load times the arc length again times the distance to the center of the arc length. Ms = Rv*x-wdl*x^2/2 Unfortunately the moments I calculate differ from the book and by the time you get to the tenth node, the difference is significant. Has anyone worked through a curved GLB calc to determine the thrust in the horizontal direction. If so, have you created a mathcad template or spreadsheet that you would be willing to share. I have created a spreadsheet to determine the x and y coordintates corresponding with the central angle alpha sub n as indicated in Table 5.19 of the AITC manual. At the very least this allows you to determine the physical characters of any arch. If anyone is interested, I will provide my work. It uses MathCad for the constant values and Excel for determining the physical location of each point on the beam. It's been too long since I've been out of school and I am getting frustrated by too many assumptions. Can anyone offer a hand that has been through this one? Thanks in advance. Dennis S. Wish PE La Quinta, California wish(--nospam--at)cwia.com ICQ# 6110557 http://wwp.mirabilis.com/6110557 "Science may have found a cure for most evils; but it has found no remedy for the worst of them all - the apathy of human beings" Helen Keller
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