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I would never rely on hairpins. My preference is to tie opposite piers together with mild epoxy steel. In my opinion the hairpins work "on paper" only if you have enough reinforcing steel in the slab to tie the piers together, and you need to use bars hooked into the piers to achieve that...

jmiec I'm a little late to this . . . I am now in the process of designing a pile supported cantilevered retaining wall, and hit this thread on a google search. Wish I had tuned in 6 months ago. I believe that the factor of safety against overturning, FS=RM/OM, figured by summing moments...

I've wanted to be able to do this for some time, but it was a low priority for me. Thanks for the thread.

I always use rebar ties within a concrete beam (say, 8"H x 12"W) directly beneath the floor slab. Of course, the bars are hook anchored to opposing piers. Size the bars to keep stress low, reduces elongation. Use ties at bar splices. Hairpins don't work on paper, so I don't use them.

Thanks EGTO1, Rats, I tried changing the link to the current file, got this message: "Your formula contains an invalid external reference to a worksheet. Verify that the path, workbook, and range name or cell reference are correct, and try again."

Somehow, through copying sheets I guess, I've created a link between spreadsheets. How does one "un-link" two spreadsheets. Stumpy

Lutfi, Your approach is sound, but may be overly conservative. As I recall, cables are normally sized with a factor of safety of at least 4. I'd back that out right away to get the design force. Seems like FS=1.5 against uplift and sliding would be appropriate.

Thanks JAE and Austim, I don't think it is related to mismatched versions of Excel. It is only a few cells that are not behaving. If you'd like, I can send you the file. Send me a private message at jpriley485@yahoo.com

I like to include the "units" within the cell with the number. To do this, I point to the cell, right click, "format cells ...", number tab, "custom" at the bottom, then place the following in "type" window: 0.0" feet" Any number placed in the...

You size the hairpins as you would any other rebar in tension. Of course, they are at an angle to the applied force, so you have to resolve the forces to coincide with the orientation of the bar. Then, you have to make sure the reinforcing within the slab is enough to carry the tension force...