Development length for Concrete Piers and Footings
Development length for Concrete Piers and Footings
(OP)
Hi everyone,
I am working on isolated spread footings for an industrial plant. I need to know the best way to calculate the development lengths for my reinforced concrete piers and reinforced concrete footings. I understand that you have to use a formulae to derive them now rather that saying you need so many bar diameters, for instance. I remember someone on this forum calling it a dog breakfast. I use mainly #10 bars for my 3' square piers (say, 12#10) and about #9 bars for my footings (say about 9#9 bars T&B EW for 8' square footing.)
Any sugestions, and useful references would be much appreciated.
Thanks, y'all and have a great weekend. Drive safe.
I am working on isolated spread footings for an industrial plant. I need to know the best way to calculate the development lengths for my reinforced concrete piers and reinforced concrete footings. I understand that you have to use a formulae to derive them now rather that saying you need so many bar diameters, for instance. I remember someone on this forum calling it a dog breakfast. I use mainly #10 bars for my 3' square piers (say, 12#10) and about #9 bars for my footings (say about 9#9 bars T&B EW for 8' square footing.)
Any sugestions, and useful references would be much appreciated.
Thanks, y'all and have a great weekend. Drive safe.





RE: Development length for Concrete Piers and Footings
ACI 318 has all the development information needed for US applications (Chapter 12).
RE: Development length for Concrete Piers and Footings
DaveAtkins
RE: Development length for Concrete Piers and Footings
Horizontal bars with greater than 12" of concrete below require 30% more length for development. Try designing footings with unreinforced standards,(Chapter 22), and use vertical reinforcing in your piers equal to or less than the anchor bolt diameters for development at the anchor bolt lap.
RE: Development length for Concrete Piers and Footings
I plan to bend the reinforcement 90 degrees at the ends, allowing for adequate cover, and let the reinfocement go to almost half the thickness of the footing. I have three types of footings, ranging in thicknesses from 36 to 49 inches. Wouldn't this be sufficient thickness to develop lenghts for both my pier and footing reinforcement? Hope you all can elaborate.
RE: Development length for Concrete Piers and Footings