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Recent content by JSgam

  1. JSgam

    Ladder Safety Systems

    Thanks human. I appreciate the input. Deformation is certainly acceptable in fall arrest systems, but should still be considered in my opinion. It wouldn't be great to have a deformed ladder leading to something critical to an operation of a facility. I also think, from an occupational safety...
  2. JSgam

    Ladder Safety Systems

    Thanks bones. I appreciate the input for the analysis perspective. I've gone into some FEA with this as well, comparing the von mises stresses in the rung for various geometries and documenting the results, whether the von mises stress result exceeds yielding and/or ultimate tensile stress. I...
  3. JSgam

    Ladder Safety Systems

    Thanks JStephen. -How did the testing go per your typical details? I take it you recommend I do testing as well for different geometries? -Yeah there's a few things to juggle on my end regarding choosing systems that have two versus three attachment points at the top rungs. We also avoid the...
  4. JSgam

    Ladder Safety Systems

    Thanks. Assuming the 3,600lbf is evenly spread over the three rungs, that's 1,200lbf on a 3/4" A36 rung, putting it past yielding if following the flexure limit state per AISC 360 section F11 (15th ed.). I'm curious how the rest of the structure behaves once those rungs pass yielding, and...
  5. JSgam

    Ladder Safety Systems

    Thanks for your input! 1) I've seen various rung types. Smooth round bar, rebar rungs, square bar rungs, you name it. 2) Regarding grade of material, the hard part is making rung material assumptions when there are no existing drawings provided, so most of the time for existing unknown...
  6. JSgam

    Ladder Safety Systems

    Thanks for your input. Your last sentence is essentially why I come to the forum. For some background, yes the load rating is based on testing, and most manufacturers have informed me that the rated loads are for "expected bending, but not breaking", which I'm assuming means rupture does not...
  7. JSgam

    Ladder Safety Systems

    Hey all. Attached is a ladder safety system used commonly on longer length ladders. Most all manufacturer's I've spoken with rely on not exceeding the ultimate strength of the rungs, and bending is expected under these loads, reaching up to 3,600lbs (split amongst 2-3 rungs). Every manufacturer...
  8. JSgam

    Fixed Ladder Design

    Just throwing this out there as well, the system components, such as the energy absorbers in the system, already reduce the average arresting force. These energy absorbers MAY have a super brief maximum arresting force of 1,800 lbs, but it's pretty rare; at least with systems that have an...
  9. JSgam

    Fixed Ladder Design

    Just throwing this out there, I would rarely ever put a cage on a ladder that has a ladder safety system. This could impede any rescue operations.
  10. JSgam

    FALL ARREST LOAD (ASCE and OSHA)

    I just wanted to mention a few things I haven't seen mentioned in any of the fall protection related threads: 1) OSHA calls for 5,000 lbs per anchor point, OR the anchorage to be designed by a Qualified Person (see OSHA definition) that maintains a factor of safety of 2. This can be less than...
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