calculating delta angle
calculating delta angle
(OP)
I have a question for anyone out there who can help me. I am a chemical/mechanical/nuclear engineer working w/ traffic engineering currently. I just want to know what is the "delta angle" and how do i calculate it? Our site plans call for radius, chord, length and then delta (which i looked online to find was called the delta angle). I do not know what it is used for or how it is calculated and was hoping someone could help me or steer me towards a textbook that would explain it. Thanks.





RE: calculating delta angle
RE: calculating delta angle
Since you are working out of your discipline, any civil type that doesn't respect you more for asking is a poopoohead!
"...students of traffic are beginning to realize the false economy of mechanically controlled traffic, and hand work by trained officers will again prevail." - Wm. Phelps Eno, ca. 1928
"I'm searching for the questions, so my answers will make sense." - Stephen Brust
RE: calculating delta angle
Sorry about the rudeness of some of the other posts. Some people have not experienced the financial need to switch between fields. When the economy in their dscipline goes down, like aerospace and oil & gas occasionally do, they will get their chance to learn.
RE: calculating delta angle
I find it intriguing that you think it's okay for a person "working outside of their discipline" who doesn't know how to do a simple concept to wing it off the internet and stamp plans. (I'm not suggesting the OP is doing so.) I personally wouldn't want to enter a building designed by someone who didn't know how to do a bending moment diagram. Nor would I want to drive on a road designed by someone who cannot find out how to calculate a delta angle. I can only imagine what the curves were like seeing as the delta angle is in the same book as the sight distance and superelevation equations.
RE: calculating delta angle
Actually I am a very experienced Traffic Engineer and to my shame I have never used a delta angle not being a Highway Engineer. We do like to specialise in our professions!!!!
However I can design you a very nice junction which will look great and handle traffic well. What I do is combine one circle with the right radius for turning with a couple of bigger ones and some straight lines. Not the correct way but it works and looks good. Hopefully the builders follow my plans.
RE: calculating delta angle