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  • Users: RPMG
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  1. RPMG

    Specifying Steel Fibers in Slab

    In a past project, we specified a jointless slab by providing a preliminary spec and dosage requirement, then stating that the final requirements would be per the delegated designer, assuming that would be the steel fiber vendor. We eventually got what we intended but the contractor tried to buy...
  2. RPMG

    Sliding Door Attachment to CFS Gyp Bd Wall

    What is a standard way of framing an attaching sliding doors to cold form steel studs? Obviously, there are a lot of problems with the arch detail below, which shows a series of 1/2" dia bolts fastening through gyp bd and tapping into the CFS header.
  3. RPMG

    Precast Wall Panel Axial Load Distribution

    For a precast wall panel with vertical joints supporting a steel girder, should one assume a load distribution similar to a cast concrete/masonry wall or similar to a 8'-0" wide concrete column? In other words, is it better to use a uniform width wall footing or a spread footing below the girder?
  4. RPMG

    Corroded Skirt Repair

    I have a skirt where the bottom few inches have rusted out, and the plan is to cut the bottom 6" out in segments to replace it. My first instinct was to CJP it all around, like-for-like, from the outside so that no one is welding in confined space. However, this skirt is 3/8" thick by 18'-0"...
  5. RPMG

    Drafting Machine Components

    Hey all, this should be a fun one. I have a drafting machine that I intend to repair. Some components work, and some don't: [ol 1] Probably a horizontal slide stop. Does not work Embedded metal plate that slides. I believe that 2 locking screws are missing. Working vertical slide stop. Dial...
  6. RPMG

    Welding 1/4" Plate to 16 GA Sheet in a T-Joint

    I'm looking at a detail that calls for 3/16" fillet welds, as if it's a shear tab. I know that that's too much heat on 16 GA. Assuming that strength isn't an issue, what's the proper way to specify this weld?
  7. RPMG

    Davit OSHA Stability Factor

    OSHA states, "Stability factor means the ratio of the stabilizing moment to the overturning moment." and "1910.66(f)(3)(iii)(A) Every davit installation, fixed or transportable, rotatable or non-rotatable shall be designed and installed to insure that it has a stability factor against...
  8. RPMG

    Existing Footing Capacity

    I have a project assessing an existing structure from the 40's where the square spread footings are under-reinforced (<0.0020*Ag). If I apply the old "one-third greater area of steel" rule, then the entire building is in distress. The footings have a monolithic pad on top, and I'm curious as to...
  9. RPMG

    Concentrated Load on Slab on Grade Article

    https://www.structuremag.org/wp-content/uploads/2014/08/C-StructuralDesign-Azzi-Apr081.pdf This article says that I can place a 65 kip post on an unreinforced 6" slab with a factor of safety of 3, which is like a 4'-0" square footing. Opinions?
  10. RPMG

    CFS Fasten Joist Thru Gyp Bd to Stud

    Are there special considerations when fastening through gyp bd? I would say that it is not permitted because it places screws in flexure.
  11. RPMG

    Interior Non-Load Bearing Partition Wall Lateral Support

    I'm in a situation where I need to provide construction support for interior non-load bearing partition walls, and I'm not familiar with standard practice in these situations. I know that the walls should extend to a diaphragm or there should be a kicker at the top for lateral support, neither...
  12. RPMG

    CJP Beam Splice In-Place

    I specified a CJP field weld, and the detailer has pointed out that it requires a backing tab which can't be installed because there is an existing metal deck and slab above. Does anyone have a solution for this?
  13. RPMG

    Concrete Pedestal: Too Short

    Problem: Bottom of base plate elevation is 7" above the Top of the concrete pedestal/pier. - I looked into grouting 7", and it is not recommended. Concrete will be used to raise the piers. - Anchorage and embedment are not a problem. - The contractor proposed to install anchors, hard shim...
  14. RPMG

    Req'd Roof Obstruction Clearance to Prevent Snow Drift

    Problem: A duct run is to be placed on a roof of k-joists. The joists have very limited reserve capacity. Given: The vertical depth of the ducts is 6'-0". Balanced snow height is 14". Goal: Minimize the height of the duct run (for wind), but provide enough roof clearance that it is not subject...
  15. RPMG

    Atmospheric Icing Load on Bar Grating

    How do you compute the ice load on bar grating? The bars are too closely spaced to use the ice load from one bar and take summations. It's not exactly a flat horizontal plate. And why does ASCE equation 10.4-2 have pi as a factor for ice volume on large flat plates? Mapped Ice Th. = 3/4" Design...

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