Doug: Fiber reinforced concrete is not, in my professional opinion, going to provide any advantage in real terms for its additional cost for a tower foundation. The biggest benefit it would provide i
Bob: First off I am a licensed P.E. in New Jersey among other states. The IBC 2000 or even 2003 does not mention that a tower that is 30' or less above a roof is ok. It does not mention towers in any
Bob: Well I bet that they want a letter and calculations to back up the statement of load capacity. 110 mph is not unusual near the coast. This is the IBC wind velocity which is a 3-sec gust value. D
Ted: You have at least two options for repairing the problem without demolition and rebuilding the foundation. First you could break out the concrete out around the failed AB down say 9" to 12". Trim
All: Pouring against undisturbed earth is quite ok. As long as you have the required reinforcing bar clearance (3" per ACI) pour away. Pier and pad foundations (spread footings, isolated footings) th
All: J-bolts are an archaic anchor rod concept. The use of straight anchor rods has be going on for over 20 years. The design codes (ACI) and building codes (IBC) have allowed straight anchor rods fo
Mark / Michael: Please see my post on this subject yesterday. I am involved in this type of thing daily. L shaped or J-bolts are not stronger than straight bolts both being properly designed and inst
Bud: Well now, the IBC 2003 itself does not specify an ice load in Chapter 16 Structural Design per se. It does reference that wind loads shall be determined in accordance with Section 6 of ASCE 7- M
Bud: I sent you a *.pdf with ASCE 7-05 Chapter 10 Ice Loadings. It also includes an Ice Loading Map that shows for Arizona only the northern half of Coconino, Navajo and Apache counties have an Ice L
Scott: When you find out how do this let me know off the insurance reflector. OK? Got to run, have a contest to warm up for. Regards Lonberg Design Group, Ltd. Hank Lonberg, P.E.,S.E. / KR7X Presiden
Rick: Why you don't want rebar to stick out of the concrete is two fold. First, the continuous moisture contact will cause and keep the corrosion process going continuously. Secondly, when reinforcin
Freeman: Your local construction rental shop should have electric/hydraulic reinforcing bar benders/cutters for rent. Look in the yellow pages. Regards Lonberg Design Group, Ltd. ____________________
Phil and list: Phil I agree with you and this is not directed at your comments but an attempt to get people to the best information on the subject. I have actually posted several times a basic concre
Adrian; Do you really need C35 grade concrete? that is equivalent to 5000 psi concrete over here? I would think that C25 for a foundation like these would be adequate, code requirement? The best way
List: 2 iitems in one post 90mph Wind Load: Is this fastest mile? or 3-sec gust? But I digress, National Building Codes have been around since the early 50's if not before. There were 3 that were ado
Scotty: You might try Tube Service Co. in Portland, they stock aluminum, carbon steel and stainless steel tube and shapes. web: www dot tubeservice dot com. Or look in the Seattle Yellow pages under
I didn't realize that Behringer manufactured antennas and towers! Who would have thought. Regards Hank / KR7X --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@con
Mark: The guys in a guyed tower are actually non-linear. It is difficult to assign a spring constant to them. I model guyed towers in my FEA programs with the guys as tension only cables the programs
Jeff, etal: A freestand tower's (aka cantilever tower) foundation strength is developed in one of two ways. It always depends on the soils strength not the weight(mass) of the base. The type that is
Chris: First off do you need a building permit? If so, and it appears that you are in Michigan, you will need a licensed PE (in Michigan) to design and/or review any design you submit. 10 kips of loa