Wind load on Steel towers supporting elevators 2

[IJR]

I believe pals in this forum have done this many times before

A steel braced tower 300ft high, with platforms and stairs and an elevator. The elevator occupies a very small area in plan, and so are stairs. Platforms are service platforms only to help erect and maintennance of the elevator.

What wind load should be used in this condition. Full tower face based value tend to be very conservative.

respects
IJR

 

[Gourile]

The procedure is to estimate the face area of the members of the tower exposed to the wind and calculate the drift force considering the shape factor of the members. As your tower is so tall and there are many members, you can calculate the area for any braced pannel and multiply it by the number of the pannels. Don't forget the variations of the wind load by the height. Also pay attention to the lift force on the members in the direction of the wind. I suppose your tower is square in plan, so you will have two sides crossing the wind which are under the effect of drift force, and two lateral sides of the tower subjected to the lifting force, which is perpendicular to the drift and in the horizontal direction. You have to place the elevator in the worst position where it produces the highest forces on the members of the tower. You also have to consider the effect of gustiness on the members, as the frequency of the gust may cause so many cycles on the welded joints.

 

[hanibal]

Hii

it depends on the top of the tower, the requirements to overcome the overturninig will overpass any side wind loadings, therefore use transparent stairs and platforms and elevator to minimise wind loads, structural tube steel members for the tower will be governed by overturning rather than wind loads i believe.....

Greetings Hanibal