Shear stirrup requirements in reinforced concrete corbel design
Shear stirrup requirements in reinforced concrete corbel design
(OP)
I am reviewing a structure designed to the ACI-71 code which states shear stirrups are required for corbels. A.h of stirrups is to be no less than 50% of primary tension steel area, A.s. The designer decided that since the shear could be carried by the concrete that stirrups would not be required. (The corbel is actually a ledge that runs for the ful length of a wall that is approximately 20 feet long.) The design was made in the eary '80s. I am having difficulty locating papers discussing the development of the code requirements. I want to be able to justify the designers choice of not meeting the code requirements, and to do that I need to know the basis of the code requirements.
Does anyone have a good starting reference point; or other ideas of how I can determine the basis/history for the code requirements for corbels? (Yes, I have googled my eyes out, and researched several papers by Mattock, Alan H., but cannot find them; they were written in the early to mid '70s).
thanks in advance.
Paul
Does anyone have a good starting reference point; or other ideas of how I can determine the basis/history for the code requirements for corbels? (Yes, I have googled my eyes out, and researched several papers by Mattock, Alan H., but cannot find them; they were written in the early to mid '70s).
thanks in advance.
Paul






RE: Shear stirrup requirements in reinforced concrete corbel design
RE: Shear stirrup requirements in reinforced concrete corbel design
You might try contacting the Civil Engineering school at More Hall at the University of Washington and see if you can get what you need there. I will try to see what I have if I can find it.
Mike McCann
MMC Engineering
RE: Shear stirrup requirements in reinforced concrete corbel design
RE: Shear stirrup requirements in reinforced concrete corbel design
Mike McCann
MMC Engineering
RE: Shear stirrup requirements in reinforced concrete corbel design
Paul
RE: Shear stirrup requirements in reinforced concrete corbel design
Mike McCann
MMC Engineering
RE: Shear stirrup requirements in reinforced concrete corbel design
This research did not address line loads, only point loads as from a beam sitting on the corbel. I do not know how your ledge projection is being loaded, but you may have to look at it differently than a corbel.
How is it loaded?
Mike McCann
MMC Engineering
RE: Shear stirrup requirements in reinforced concrete corbel design
The "long" corbel is point loaded.
Thanks,
I did manage to find professor Mattock's research on the PCI Journal website. Initially I just searched under the quarter for which his articles were referenced. Surprisingly for the years that i searched (1975 and 1976) only two quarters for each year turned up - needless to say they were not the quarters that his research was referenced/published. Therefore I explicitly listed the titles of his research and found two of three.
I appreciate your help and comments.
Paul
RE: Shear stirrup requirements in reinforced concrete corbel design
Mike McCann
MMC Engineering
RE: Shear stirrup requirements in reinforced concrete corbel design
Might be a starting point.
RE: Shear stirrup requirements in reinforced concrete corbel design