Double Angle bending
Double Angle bending
(OP)
I am trying to calculate the allowable stress for double angle beams used to support utility piping. The "stem" of the double angle is turned up, i.e. the stem is in flexural compression. I have some literature on wt shapes in this configuration, seems like a lot of derivations just to arrive at 0.6Fy for the allowable stress. Just wanted to know if anyone had come across this and how to arrive at the allowable stress relating to lateral torsional buckling.






RE: Double Angle bending
RE: Double Angle bending
RE: Double Angle bending
I can't visualise any specific advantages.
Why don't you go for a channel or I- beam section? Ligher
and easier to connect, and you don't have analysis and
design problems!
Hariharan
RE: Double Angle bending
Carl Bauer
RE: Double Angle bending
Ron
RE: Double Angle bending
Otherwise, turn the angles over such that the legs are turned down. This will make allow more bearing area for the pipe, make it easier to use "U"-bolts to secure the pipe, and negate the "stem" compression issue.
Ron
RE: Double Angle bending
RE: Double Angle bending
However while at the subject you might also want to take a look at this article:
Design of single and multiple Angle columns and beams, by Cedric Marsh, Journal of Structural Engineering, July 1997 page 847-856
That is for reference. But we frequently design pipe racks and we use channels or I-beams. I assume your utility is real small.
Good luck.
RE: Double Angle bending
Thanks for all the input.
Ag89
RE: Double Angle bending
You might consider a pre-fabricated product that is both structurally viable and contains a spun aluminum flashing flange to allow better roof penetration connection. These are known as Thaler supports (Thaler is one brand, but I believer there are others). Check their website at:
http://www.partsdome.com/thalermetal/default.asp?ShopperCurrency=USD
I have used these before and they are high quality.
Ron
RE: Double Angle bending
Just use "unistrut" like everybody else does.
Besides , it's cheap, and comes in a variety of sizes and strengths.
Rod