Appendix D for Round Piers
Appendix D for Round Piers
(OP)
Does anybody have a good design method for utilizing Appendix D on round piers? I am mainly looking for what to use for edge distances (camin, camax, ca1, ca2). I also need to figure out how to calculate effective embedment and and effective edge distance for ca1. Effective embedment comes into play when you are near three or more edges. How do you calculate the number of edges for a round shape? I considered just using the largest square that would fit inside the circle, but it is way too conservative, and my pier will have to get extremely large.






RE: Appendix D for Round Piers
RE: Appendix D for Round Piers
I wrote a spreadsheet to implement Appendix D when it first came out and had the same questions. I believe the issues you are facing are usually resolved by using stirrups to contain the vertical bars or a welded base plate so that the concrete failure modes do not govern.
RE: Appendix D for Round Piers
RE: Appendix D for Round Piers
The early versions of Appendix D did not rigorously consider the effect of transverse reinforcement. The theory is based on anchor rods in plain concrete and the influence of edges. I don't see much in the 05 version either except for minor coefficient adjustment when "supplemental" reinforcement is provided.
Appendix D is a very good tool but if you want to create anything remotely practical or slick like the round sign piers you see along the highway you will also need to formally consider stirrups and welded plates.
RE: Appendix D for Round Piers
Basically, the goal is to develop reinforcement inside the failure cone and extend it into the main structure (using strut and tie if necessary) in such a way that if the cone tries to break out the rebar anchors the cone into the structure.
This is the method that should be used for any significant uplift loads or for any small footprint situations, such as pedestals or small footings.
RE: Appendix D for Round Piers
RE: Appendix D for Round Piers
This supported a gigantic single stanchion cantilevered billboard. I was a bit nervous parking under it!
RE: Appendix D for Round Piers
RE: Appendix D for Round Piers
RE: Appendix D for Round Piers
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RE: Appendix D for Round Piers
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RE: Appendix D for Round Piers
RE: Appendix D for Round Piers