Guy Anchor Detail
Guy Anchor Detail
(OP)
I have designed a guy anchor (reinforced concrete block) and some questions have been raised about the detail I provided. Please see attached and provide any feedback if anything jumps out at you. Thanks in advance.
https://res.cloudinary.com/engineering-com/image/upload/v1490112234/tips/Guy_Anchor_Detail_dqidqi.pdf
https://res.cloudinary.com/engineering-com/image/upload/v1490112234/tips/Guy_Anchor_Detail_dqidqi.pdf






RE: Guy Anchor Detail
1) I would be really specific about the specifications on the guy wire, preferably with an ASTM callout, plus the diameter, and it should have some short of head or j-bolt type of configuration at the low end to provide pullout resistance. I would also specify the minimum concrete embedment. I realize some of this you might have already specified in written specs or elsewhere.
2) You will need to check the anchorage capacity per ACI 318, if you haven't already done so.
3) Based on my own experience, I know the contractor might have a very difficult time getting that cube of reinforcing put together, due to all the intermediate layers. I would recommend putting the mats of each-way reinforcing only on the outer faces of the footing (therefore, 6 total mats of each-way reinforcing, 1 on each face). You can upsize the bars as needed to meet the ACI 318 min-reinforcing requirements. With this large block I'm guessing you don't need the reinforcing to act as any tension resistance. Your contractor will definitely thank you.
RE: Guy Anchor Detail
RE: Guy Anchor Detail
RE: Guy Anchor Detail
Agreed about placing the anchorage aligning with the "line of force" -- difficult to construct. Do you really need that for the deadman to calc out globally? As a contractor, I'd probably rather pull out a 5x5 deadman out of my yard then worry about making this special 4x4. Or if a 4x4 with an anchor at the top center would work, so much the better.
I've never thought about it, but I also agree that the layers of internal reinforcing seem unlikely (to be required, constructed properly, etc).
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The name is a long story -- just call me Lo.
RE: Guy Anchor Detail