Spread Footing Reinforcement
Spread Footing Reinforcement
(OP)
I am looking at the design of a billboard foundation. The pad portion has two layers of reinforcement, top and bottom. The foundation is subjected to high moment. Can someone explain me why do we need top pad reinforcement? sketch is attached.






RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Spread Footing Reinforcement
thread507-323270: top and bottom reinforcement of footing - sorry, don't know how to link to it.
Still don't really understand why you would need it if it fell within the kern. Doesn't seem like there would be a net overturning concern since there would be no net uplift on the heel of the footing.
RE: Spread Footing Reinforcement
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement
If you are not using the footing to resist overturning, why is it so big?
This is an automatic fail question on the PE exams
RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement
I didn't know they did that....
RE: Spread Footing Reinforcement
If you're talking about something where you don't uplift with unfactored loads but edge into it in a factored 1 in 50 wind event, then I can see not wanting to spend the extra money for that.
RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement
RE: Spread Footing Reinforcement