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Recent content by bob33

  1. bob33

    Prefabricating Bar Mat with Welds

    A large number of precast bridge beams were replaced during construction of the Herb Gray Parkway in Windsor, ON in 2013 because tack welds had been used,
  2. bob33

    Concrete Cracks on Mezzanine

    Has "bolt banging" been ruled out? See Rabbit 12 - 25 Feb 21:43.
  3. bob33

    Conduits and pipes embedded in slabs

    I have found that the MEP contractors normally do not comb through the structural drawings and specs looking for items like this. It would be better if the MEP consultants could also cover this in their drawings and specs. Regarding slabs, it is standard practice to place conduit directly on top...
  4. bob33

    Korolath Shims

    Regarding heat transfer, stainless steel has about 1/3 the thermal conductivity of ordinary steel.
  5. bob33

    Miami Pedestrian Bridge, Part XIII

    Earth314159 Google "The Saga of a Bridge - 2013 - John Sankey" and check Oct 15 for Buckland and Taylor report and Dec 3 for Delcan report.
  6. bob33

    Miami Pedestrian Bridge, Part XIII

    There is a pedestrian bridge over the airport parkway in Ottawa, ON that was originally designed as a cable-stayed bridge, but the designers called for pipes instead. The use of pipes was heavily criticized, the designers were fired, and the new design used cables. This happened about 6 years ago.
  7. bob33

    Design Procedure for double angle bolted column with eccentricity

    Is there temporary shoring in place?
  8. bob33

    Allowable gross bearing capacity for checking pressure under mat foundation of 35 stories building!

    This is a good question for a geotechnical engineer. Go to Foundation Engineering section and get more tips from experts.
  9. bob33

    IRC Foundation Wall Reinforcing

    Empirical design often does not meet the requirements of an engineered design. There have been many examples, but one of my favourites is the empirical design of unreinforced masonry walls subject to out-of-plane wind loads. I used to design school gymnasium walls in Canada that were almost 20'...
  10. bob33

    Multi story brick support

    The Masonry Society has a recent webinar available entitled Rational Design of Masonry Veneers and Shelf Angle Supports.
  11. bob33

    Wood modular classroom roof structure

    School portables are not all made the same way. If no drawings are available, I would open up the ceiling enough to see what was done.
  12. bob33

    Beam Seat Connection for Existing Masonry

    I would remove existing bricks and build in the anchors using bricks and mortar to help get a good bond to existing wall. I would also provide at least 6" bearing onto the wall for glulam beams.
  13. bob33

    Mid Terrace Demolition

    Yes, you should be concerned about lateral stability. There may not be enough shear walls to resist a wind that is perpendicular to the old party walls.
  14. bob33

    Acceptable failure rate for glass

    See ASTM 2751-17 Standard Practice for Design and Performance of Supported Laminated Glass Walkways. I doubt people will use a glass walkway that has a high probability of cracking even if there is no danger of collapse.
  15. bob33

    Onus to Arrange Inspection

    If the retaining wall is reinforced on the earth face, you can check the spacing of the earth face rebars and footing dowels in the wall and the top bars in the footing using a pachometer. If there were no shop drawings, you can chip in at one or more locations in wall and footing to verify the...
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