1. ATTENTION returning members. If you are coming here from the old forum for the first time, you will need to reset you password. However, we had an email problem getting password reset links set out to a lot of the email addresses. That problem is temporarily rectified but IF you still have an issue, email me direct at info@thebuildingcodeforum.com and I will give you a temporary password.
    Dismiss Notice
  2. Welcome to the new and improved Building Code Forum. We appreciate you being here and hope that you are getting the information that you need concerning all codes of the building trades. This is a free forum to the public due to the generosity of the Sawhorses, Corporate Supporters and Supporters who have upgraded their accounts. If you would like to have improved access to the forum please upgrade to Sawhorse by clicking here: Upgrades
    Dismiss Notice

Footing Keyway

Discussion in 'Residential Foundation Codes' started by Keystone, May 31, 2019.

  1. Keystone

    Keystone Sawhorse

    Joined:
    Feb 23, 2010
    Messages:
    813
    Likes Received:
    105
    Does ACI specify having a keyway or vertical upright dowels for connection between footing and foundation or any wall above a footing when we have equal balanced backfill?
     
  2. Mark K

    Mark K Platinum Member

    Joined:
    May 12, 2010
    Messages:
    1,483
    Likes Received:
    120
    You need to talk to an engineer. As opposed to the IRC ACI does not provide prescriptive solutions for common situations. ACI 318 provides the engineer wit calculating the capacity of concrete elements.
     
  3. Keystone

    Keystone Sawhorse

    Joined:
    Feb 23, 2010
    Messages:
    813
    Likes Received:
    105
    Since not one other person replied that means one of two things;
    1. Everyone requires engineering for footing/foundation connections.
    OR
    2. I’m asking a question that really isn’t relevant in most eyes and it’s accepted practice to sign off on whatever is onsite.
     
  4. mtlogcabin

    mtlogcabin Sawhorse

    Joined:
    Oct 17, 2009
    Messages:
    7,335
    Likes Received:
    832
    I don't use ACI for residential and the IRC requires vertical bars in my seismic zone regardless if the back-fill is equal or not.
    2012 IRC
    R403.1.3 Seismic reinforcing.
    Concrete footings located in Seismic Design Categories D0, D1 and D2, as established in Table R301.2(1), shall have minimum reinforcement. Bottom reinforcement shall be located a minimum of 3 inches (76 mm) clear from the bottom of the footing.
    In Seismic Design Categories D0, D1 and D2 where a construction joint is created between a concrete footing and a stem wall, a minimum of one No. 4 bar shall be installed at not more than 4 feet (1219 mm) on center. The vertical bar shall extend to 3 inches (76 mm) clear of the bottom of the footing, have a standard hook and extend a minimum of 14 inches (357 mm) into the stem wall.
    In Seismic Design Categories D0, D1 and D2 where a grouted masonry stem wall is supported on a concrete footing and stem wall, a minimum of one No. 4 bar shall be installed at not more than 4 feet (1219 mm) on center. The vertical bar shall extend to 3 inches (76 mm) clear of the bottom of the footing and have a standard hook.
    In Seismic Design Categories D0, D1 and D2 masonry stem walls without solid grout and vertical reinforcing are not permitted.
     

Share This Page