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  • Users: nirias
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  1. nirias

    ACI 318-11 tension only grade beam

    I need tension ties between footings of a pre-engineered metal building to resist outward forces of the portal frame's columns. Because these are reinforced concrete elements tying footings, they would seem to inescapably fall under "grade beam" requirements in section 21.12.3 of ACI 318, with...
  2. nirias

    Purlin bracing in metal building

    I'm reviewing a proposal for a pre-engineered metal building (PEMB) with standing seam roof and don't know what I should be looking for in terms of purlin bracing. The snow load is 200 psf (315 ground snow) with a pitch of 6:12, so purlins experience significant off axis loads that make lateral...
  3. nirias

    Calcium Chloride in concrete for perimeter foundation??

    Hi, I hired a contractor to replace the brick foundation on my two story house with an inverted "T" concrete foundation. The footing is 18" wide by 18" deep with an 8" stem wall. Reinforcing is #4 bars with 3" cover. Only after the concrete was in the forms did he explain he had ordered...

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