Jim/Arthur: Rotating towers tubular/cantilevered like berthas or triangular trussed like Rohn with rotating guy rings need to have some point fixed against rotation somewhere in their height to devel
Ruslin: You need to get a copy of TIA-222-G. This is the latest edition of "Structural Standard for Antenna Supporting Structures and Antennas." You will find all you need in this standard which is r
Tommy: Talk with US Towers they can provide a sealed set for your state for a fixed charge. An alternate route is to go to the ARRL VCE (volunteer consulting engineers) site and see if there are any
Rick: Actually the concrete code specifies that for concrete cast against and permanent exposed to earth; the minimum clear cover is 3". For concrete cast in forms and subsequently having exterior ex
Dion: Go to this website: http://www.bosunsupplies.com/StainlessInfo2.cfm It has a good explanation of SS alloys. 18-8 is the nickel-chromium alloying of the base metal. Regards Lonberg Design Group,
Bert: The best answer to your generalized questions is; it depends. Depends if the foundation is supporting only vertical load as in a guyed structure. Depends if the foundation is to support a canti
Hi Al: In the case of a cantilever (free standing) structure say like a ham tower, the wind or seismic force developed is horizontal (lateral). This force creates a cantilever moment at the base equa
Dan: "For engineering reasons that don't bear explanation" this is the worst type of foundation to try and use fiber reinforcing to eliminate rod reinforcing in a foundation. I have posted to the ref
Bill: readily available. Go with #9's or #11's. Just prorate their spacing base on the area difference. I believe that the foundation calls for #10 bar vertical at the corners, IF that is the case su
All: To give you a different perspective on the amount of overlap that should be considered in slip joint connections, the industry recommended practice for tubular and multi faceted steel transmissi
Kevin: You are absolutely correct on this and I have been in e-mail contact with Rudy concerning his foundation and was cc'ing the list but it seems that those didn't get through. Richards post just
Maybe what Mike is looking for is "Bustar" expansive grout. See h**p://www.demolitiontechnologies.com/ There are also mechanical expanders that can be placed into drill holes. Google: chemical concre
Neil: The WT-51 is the tower Tashijan sells and the W-51 is the old Triex design. First off the old Triex was designed using "fastest mile" wind velocity and the old UBC. The newer WT-51 design confo
Dave: The important number is the yield stress not the tensile stress. 6061-T6 and the stainless, most likely 304 or even 316, have about the same yield of 36,000 psi plus or minus. This is the thres
This is a somewhat long and maybe winded response and violates the concept of snipping the previous posts. If you are not interested you should hit delete now. Tom, good call, as this is the foundati
Mike: An engineer wouldn't break your bank, but I digress. You don't say what the plan dimensions are of your 3.5' deep hole are so it is hard to tell you anything but you could have drilled and grou
Dennis: The correct standard is ANSI/TIA 222-G. See below for url's to both TIA and IHS global where you can buy the standard. Be prepared that it is not cheap. Maybe if you google the tia 222 g you
Steve: First of all why do you want to attach the tower section to the rebar. This would serve no useful function unless you are trying to hold the section up while you pour the base. Just attach som