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  • Users: murphy89
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  1. murphy89

    Bending Class of Reinforced Steel Beams

    Hello, I am working on reinforcing steel beams for new, higher loads. For steel beams, the bending class determines if you use the plastic section modulus (Z) or the elastic section modulus (S). How can I figure out what the bending class of my new reinforced beam is? I've read through the steel...
  2. murphy89

    Historic Electrode Strength

    Hi, Does anyone have any idea on if the Electrode Ultimate Tensile Strength (Xu) for a weld has changed over the years? I am evaluating the strength of a fillet weld done in 1972. Base metal is 300MPa steel with Fu of 450MPa.
  3. murphy89

    Existing Concrete Like Sand

    Found an existing column on a site where you can scrape the concrete away like sand...has anyone ever seen this? What could the cause be? Video is below. https://res.cloudinary.com/engineering-com/video/upload/v1717079368/tips/20230615_162711000_iOS_pvlo4y.mov
  4. murphy89

    Grouting Under Beam Pocket in Masonry Wall

    Hello, Does anyone know where the typical design of grouting 3 courses solid under a beam pocket in a masonry wall comes from? I see it all the time but don't know where the 3 courses comes from, why not 2, or 4? What failure mode is governing the number of grouted cores beneath a beam embedded...
  5. murphy89

    OWSJ with Concrete Roof Slab

    Hi there, was on a site this week with OWSJ framing between larger steel trusses. The joists support a v-pan and concrete roof slab. Pictures are attached. Apparently, this was built in the 80's. For context, the joists are 12" deep @ 2' spacing, and the trusses are 5' deep @ 8' spacing. I...
  6. murphy89

    O86 Built up beam Moment Capacity

    Hello, I am working through a spreadsheet written a number of years ago (probably early 2000's) by another engineer that calculates the number of plies of various lumber sizes to satisfy load, span, and bearing length criteria that I input. One section of their spreadsheet under a title they...
  7. murphy89

    Lifting Certification for Existing Structure

    Hi, I've read through some of the existing threads for lifting but don't see anything that I think applies to my situation. I've been asked by a client to provide a lifting certification (he thinks that's what they need) for a small steel framed structure that houses a bunch of electrical...
  8. murphy89

    Diamond Dowels for Reinforced Slab on Deck

    Hello, Here is the situation: Level 2 in a warehouse will have forklifts roving around. Floor system is: 6" total thickness, composite steel deck with concrete, reinforcing top and bottom both ways. Contractor wants to do a construction joint. I am going to direct them to place it in the middle...
  9. murphy89

    Fire Resistance of Bare Steel - NBCC

    Hi, I'm in Canada and trying to get more familiar with fire resistance and have been doing some reading about UL designs, BXUL7. The question I'm trying to answer for myself is: Can bare steel be used to achieve any kind of fire resistance, or does it have to be combined with a fireproofing...

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