transmision tower of 100m hight

[saad73joss]

Hello gents,
i m designing a transmission tower with 100m hight with angles sections only. the transmission tower has dishes (6 units of 1.8m diameter, weight: 130 kg and 2 units of 1.2m diameter, weight: 50kg) (total weight: 750kg, forming an area of 20 m²).
Anybady can help me by giving me an idea about the distance at the base of the pylone?
The inclinaison should be less than 1° at the top
many many thanks
( sorry for my english)

 

[MiketheEngineer]

These are NOT easy. Get some real professional help from someone who has done a few(many) of these....

 

[msquared48]

Is this a guyed or free standing tower? What country or jurisdiction?



Mike McCann
MMC Engineering

http://mmcengineering.tripod.com

 

[saad73joss]

actually it s a free standing tower.

 

[saad73joss]

I have already designed free standing towers of 20,30,40,50 and 60m hight

 

[transmissiontowers]

If you use PLS-Tower software to do the design, you can use lots of secondary joints and minimize the primary joints and run several trials and find the minimum weight. Just change the coordinates at the base and do an optimum design for each base spread. You can model the redundants in the tower model and have them designed too.

Is this a 3 leg triangular cross section or a 4 leg square tower? If it is 3 legs, do you use a closed standard angle to make the 60°?

_____________________________________
I have been called "A storehouse of worthless information" many times.

 

[saad73joss]

Hello

unfortunately I don t have this softawre. I had MS Tower but I do not have the license.

I managed to design the pylone with 15m base. The client doesnt want to use an Angle bigger than L200x20 that s the reason.

I have 4 legs.

Cheers

 

[transmissiontowers]

If your software allows joint/node generation you can try to set the base spread and do a design to get member sizes. Then you vary the base width a little and do another member design and compare total weight. By using trial and error, you can pick a base spread that works for the angles you choose.

I used this method to design a 332 foot tall river crossing transmission tower in a hurricane zone and it weighed a little over 200,000 pounds. For very tall lattice towers with lots of wind area, the wind area of the tower itself with no antennas or dishes or wires will be a large percentage of the leg and foundation loads.

_____________________________________
I have been called "A storehouse of worthless information" many times.