"How and where should I apply the forces on the frame"

Don't know, do you?

Neither do I. That's why I'm not, "doing the analysis of trasmission tower". I'm not qualified to do such analysis. Neither are you, apparently.

Consult an engineer with the proper training for the proper answer.

Good luck.

If you have to ask that question, you are, clearly, not qualified to perform the work.

In some respect the previous 2 comments are correct but limitative.

I imagine that you are a program user and not a civil or mechanical engineer trained in the design of towers.

The question is are you trained in the analysis of mechanical structures or not?

If you only have a program and no engineering training (even if you did not design towers) then forget it and say you do not have the skills.

If you are a trained engineer but lack of experience in this particular field you can get from different sources (google) the wind speed versus elevation and indications about the equivalent cross area which depends on the structure geometry and the ratio between profiles and total area. Since you consider a profile structure you place on the nodes the forces considering that the area is uniformly loaded. On every node do come the forces from all areas which meet at the node.

I hope you do not intend to limit the loading to the wind a,d you are aware of ALL other, if not results will not be representative.

After you made your computations let a trained professional check them since you do not have the know-how to appreciate if results are or not correct even if you are an engineer since you did not work in the field.

I presume that it is a school project and I gave you only the way to take but not any more.

You could after your simulations bring the results to CR4 to have a qualified opinion from colleagues which I am sure were already involved in such problems.

Hello

Yes, transmission towers are analysed as space trusses. Wind loads shall be modelled as joint loads at individual panel levels. I am not aware of the "Aabaqus" [Software?] you mentioned. If its similar to STAAD or SAP then the above method is applicable. The legs supports shall be assigned as "Pinned" or "Simply Supported" the Joints shall be assigned as pinned joints. If you need further help on analysing towers, wind loads calculations Etc., Please let me know at fareed_siddique@yahoo.com I use American Standards TIA/EIA 222F & G for wind load calculations and analysing the transmission towers.

Mohammed Fareeduddin

B.E; M.E Civil Strl.

Member of:

ACI / AISC / TIA-EIA222 & ASCE

http://www.linkedin.com/in/mohammedfareeduddin