I've noted a bit of confustion on the effectiveness of torque bars. First, torque bars do work when rigidly installed. Second they work without resorting to 6 point guys (2 per arm) Third, they are m
Roger etal: You are partially correct and partially incorrect. You can't eliminate basic vector statics from the argument of the usefullness of torque arms. I specifically mean the style used for 55g
I thought that was what I said, but in plain language. <:-)) Rephrased, the work far better with two guy lines than they do with one, but even with one there is more resistance to rotation than witho
Hi, To put it another way, guy wires whose line of action passes through the axis of rotation are not a great deal of use in preventing rotation. Chris Newton was an Englishman ______________________
Chris: Bingo and you are the winner! Regards Lonberg Design Group, Ltd. Hank Lonberg, P.E.,S.E. / KR7X President _______________________________________________ See: http://www.mscomputer.com for "Se
plane, then of of degrees scheme tower is guy but the farther away the attachment point is from the center of rotation the bigger the angle on the guy wire so the higher the resistance to the twist.
displacement is resisted by the guys as the vector summation of the forces in the guys. Equal and opposite total reaction. The tower section is in equilibrium and will not translate in its plane. Rem
I may be incorrect, but I am under the impression that, when using 'torque bars', the guy anchors are placed in a position that makes the tower face towards the anchor point. This allows double guys
Thanks Hank I didn't really understand this until I drew a top view of a tower in AutoCAD. It was then easy to see that the torque arm offers little resistance, since it's in line with the guy and th
the bigger the angle on the guy wire so the higher the resistance to the twist. Here is some food for thought. Take it to the extreme where the torque arm is lengthened and rigidly attached to both
Tom: When I refer to a star or six point guy arrangement I mean 2 guys from each guy point on the tower. With 3 anchor points on the ground you get a 3 pointed star in plan. I am rethinking my earlie
There is no argument that a 6 point guy is far superior to a 3 point with or without torque arms. Just look at the original geometry, the torque arms can obviously not do anything until they are turn
system, well, there But no one is saying they are equal Keith. I see a serious flaw in the idea a guying system does nothing to reduce twist. That idea only would be true if the guyline attached to
Excellent explanation! There was no intention on my part to refute that normal 3-point guying will not resist twisting. For guyed towers where twist must be reduced to near zero, then one must employ
I just did some guy wire length calculations. I used a 100' Rohn 55 tower with a 12" torque arm at the top and a 80' guy radius. The guy wire length is 126- 6.28". I then rotated the tower 10 degrees
On Tue, 3 Aug 2004 21:09:23 -0400 "Tom Rauch" <w8ji@contesting.com> writes: It's not the increase in tension that's the dominant factor, it's the fact that once the tower twists, all three guy wires
the increased stretch is just the first step. now figure the change in angle of the deflection of the guy wire and calculate the force vector at the end of that torque arm vs the force it would be on
That makes sense. The tower has more than double the resistance to rotation if we only double the effective radius by adding torque bars. 73, Tom W8JI _______________________________________________
Offhand I don't know the value of the modulus for a typical EHS guy wire, but just imagine for a minute how hard you would have to pull on a guy wire that is already tensioned to 600 lbs in order to
Someone named "Grillo's" must have sent me a huge file on this but my server won't allow large files to be sent as an e-mail attachment so it was deleted. Maybe it was something useful. Like Pete say