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transmissiontower, I was able to locate a AISC paper on double angles in compression with test reports for various double angle configurations. Using this paper I was able to convince the Consultant on revising their design with continuous reinforcing angle with more intermediate connections...

Transmission tower, I am not disputing your suggestions. It is just hard for me to accept this as adequate reinforcement for the tower leg, based on the material provided so far. Thanks

Thanks to both of you for your input. I think one thing is clear. It is very difficult to accept this design concept based on a quick review of the details. This approach must be justified on paper with computations and a list of assumptions. I find it hard to believe that the two angles...

Transmission Tower, Thanks for your response. You have to look at the details carefully to evaluate it.As the new angle is not connected at the panel points, how can we expect it to provide lateral bracing? Without a proper support system how can it function?. That is why I have reservations...

Attached are sketches from a proposed tower leg reinforcement scheme proposed by a consultant. The tower leg is overstressed between 108-114%. The new reinforcement piece is the same size as the original tower leg. With the new angle, the composite section properties are computed and new l/r...

You could write to the members of the Committee responsible for developing the Standard. Getting their e-mail address may be a challenge. I wrote to one of the members but never got an answer back. I am afraid I am not at liberty to pass on that member's e-mail address. Contacting ASCE over...

Public Safety, Liability, Professional engineer license - These are not worth risking because there is always a remote possibility something may go wrong. Having no knowledge about the pretzels with many twists, I would recommend a design with redundancies. If site conditions permit and there...

If you put yourself in their shoes, you will realize that your company has a moral obligation to provide the design data. Of course, your company should charge for their time and expense (yes, you could even include some markup as this data is valuable to some end user) and the requestor...

Transmission Tower, You then must be Sherlock Holme's good friend!! I know Leon when I was in my previous job. Of course, he is smart. I have kept a low profile and did not bother to chase after committee memberships. In my book, Massimo Finzi, Chief Engineer SAE (70's and early 80's) was one...

Separation between the static wire and energized conductor is always an issue where icing is possible. As the conductor is energized ice may melt/ fall off but the static with no heating retains the ice. So, mid-span separation with differential ice loading (ice on static and no ice on...

http://www.balvac.com/project_profiles.asp I have performed repairs using the above company/product. I would recommend giving them a call. A microwave tower with poor air entrained concrete foundations (vintage -1960) in Niagara Falls, NY was repaired with this method. Of course, the company...

Transmissiontower, Thanks for leading me to the right forum to post tower related questions. I concede that you are ahead of me, but by two years only!! I do not know whether you worked with the BPA tower analysis program. I enjoyed the challenge of working with a program where to get a plot...

Hi Transmission towers, I have been at this long enough that I know a thing or two. I am aware of everything you wrote about and left to me, I prefer a new member also. But the client would like to leave the designs alone unless one can prove that it will not function as assumed. That is why I...

Sdz, Thanks for your response. This is the answer I was looking for. This is my position too but I am having hard time convincing the young and old(?) engineers that slip will prevent the composite action. They say not to worry!! I prefer the new member be connected to both end joints so...

I apologize for the long delay in getting back. A scan of the reinforcement detail is attached. The overstress is around 25%. My question to the forum is about the underlying assumptions with this type of reinforcement. Can we add a member to an existing member as shown on the attachment and...

Hokie66, Thanks for a very quick response. Let us assume the existing member angle as having horizontal and vertical legs. It is connected to the tower framing with the horizontal leg. The reinforcement member is connected to the vertical leg. Hope this explanation is sufficient. Otherwise...

I am reviewing a design submittal for reinforcing a high voltage transmission tower which is in service. All structural members are single angles, mostly equal leg.The existing member is overstressed in compression and the proposed reinforcement consists of adding a member of the same size by...