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  1. bmrossetti

    Mechanical coupler for #4 rebar stirrup

    ajk1, I've had good results using Zap Screwlock couplers by BarSplice Products. The couplers are a little bulky, so you need to watch clearances, and you will need a few inches of exposed bar to attach to. Brandon
  2. bmrossetti

    Sawcutting Control Joints

    Canuck67, In my experience, cutting or discontinuing the mesh at the contraction joint is not necessary. It is more important to use a low-shrinkage mix design with low total paste content and well-graded aggregates (see the high-performance "athletic" concrete articles by Bill Phalen of...
  3. bmrossetti

    Gypsum roof deck on cardboard

    Yes, I think this is who you think it is... how is everything going? You the last man standing yet, or what? ;-) Sounds like an interesting project. A probe is probably your best move at this point. I would not be surprised if instead of steel section (such as bulb tees) there is only welded...
  4. bmrossetti

    Gypsum roof deck on cardboard

    This looks like one of the United States Gypsum cast in place roof systems. As lexpatrie indicated, there is often a steel section embedded in the gypsum. The wires parallel to the joist span appear to be bent up at the perforations in the cardbaord, and are presumably draped over the steel...
  5. bmrossetti

    Damaged Large Pipe Column Repair

    I would look at encasing the section in concrete, with vertical bars to resist the flexure, ties for confinement, etc. Extend the encasement high enough to ensure transfer of forces between the pipe and the concrete. If needed, weld studs or vertical "fins" to the pipe to help transfer forces...
  6. bmrossetti

    Expanding mortar concrete demolition

    shobroco, I've looked into non-explosive demolition agents (such as Dexpan) for previous projects, but have not actually used it yet. A 44lb. box of Dexpan will run around $100, and according to the literature will fill approximately 36 LF of 1.5" diameter holes. The manufacturer recommends a...
  7. bmrossetti

    Connecting to an Existing Structure

    dik, The International Existing Building Code (IEBC) lays out the provisions that JAE and dhengr mention for when modifications/alterations will require checking the existing structure for compliance with the current IBC, or, in certain circumstances, the codes that were in effect when the...
  8. bmrossetti

    Excavation earth retaining structural system

    GalileoG, This type of system is called a secant pile wall. Hope this helps. Brandon
  9. bmrossetti

    Force calculation of sphere against plane

    If you have access to a copy of "Roark's Formulas for Stress and Strain," there are good tables for contact stresses, including your particular case of a sphere on a flat plate. Regards, Brandon
  10. bmrossetti

    Sizing of boulders for security barrier (vehicle impact)

    Munnin, For a basic, first-principles approach, I've successfully used the following procedure: 1. Neglect vehicle crush, boulder spalling, etc. 2. Assume a fully plastic collision. 3. Use Conservation of Momentum to determine post-collision velocity of the vehicle-boulder system. 4...

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