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Recent content by redsouther

  1. redsouther

    CMU Vertical bar spacing vs dowel spacing

    Yes, the flexure w/ axial load controls, and the wall works with #5 verticals at 48" assuming pinned ends. My main question is whether the additional intermediate verticals, which wouldn't extend to the footing, would actually "do" anything.
  2. redsouther

    CMU Vertical bar spacing vs dowel spacing

    Thanks for the responses. In this instance the owner is requesting tighter grout/rebar spacing for security reasons. Strength-wise, the wall is fine with a 48" spacing, so I considered not using dowels at the bars that aren't required for strength.
  3. redsouther

    CMU Vertical bar spacing vs dowel spacing

    On the vast majority of load bearing CMU wall design we do in our office, the vertical bar spacing is established and all vertical bars are extend to the foundation via dowels. In other words, the vert bar spacing matches the dowel spacing. I am wondering if anyone has experience with only...
  4. redsouther

    Construction Joints in a water containing structures

    I recently did an aeration basin in a WWTP that was close to this size without any CJ's (though we did have a couple of expansion joints). However, as others have pointed out, ACI 350 requires a much tighter bar spacing for such a condition, so you'd have to redesign your slab.
  5. redsouther

    Appropriate use of cap plates for W-shape columns w/ shear connections

    In our office, we have a "rule of thumb" that cap plates are typically provided at the top of all wide flange columns in structural steel framing, unless there is a compelling reason not to do so (erection issues, etc.) - even those with beams framing into the flanges and/or web only. I haven't...
  6. redsouther

    Which Code Applies for Small Full Vacuum Tanks?

    I have been asked to design a small tank (31" dia x 144" tall) to be used as a water/air separator. The tank is to be designed for full vacuum and atmospheric positive pressure, and is to be shop tested to 1.5 times working pressure. I know that the pressure vessel code covers tanks above...

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