electrical Transmission towers

[Mlmlzx]

Dear sirs,

Lattice steel towers, though of stiff construction, will be deformed under load. To reduce the visibility of the deformation, usually these towers are erected with an inclination against the anticipated direction of load.

How is this done?

Regards,

 

[dik]

I've not seen that done. Often do retaining walls with a sloped face on the exterior so any rotation makes the wall 'more vertical'.

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-Dik

 

[waross]

They sublet the design to a small firm in Pisa Italy, who specialize in designing inclined structures of all types.

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Ohm's law
Not just a good idea;
It's the LAW!

 

[bacon4life]

I have not seen that done with lattice towers, though I have only worked with a limited number of lattice towers. I once had civil engineer tell me that he had to use surveying equipment to notice lattice tower deformation.

For steel poles, pole are often leaned (raked) a few degrees during installation using leveling nuts.

Sometimes near hydroelectric dams the the tower foundations are designed to intentionally lean the tower 30-45 degrees. Here is an example from Hoover dam:

 

[davidbeach]

Boundary has other examples of towers leaning over the edge.

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[Mlmlzx]

is stub angle and tower angle the same thing? It appears they construct the towers inclined from tbe beginning only.

Regards,

 

[bacon4life]

No. For a stub style foundation, each stub usually matches the taper of the tower, so they all have approximately a 10 degree angle. Here is an example of a typical stub angle for a vertical tower: