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  • Users: CTW
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  1. CTW

    Design for a Rooftop Fitness Center

    Check WoodWorks Link to see if they have any documents relevant to fitness center loads and vibration.
  2. CTW

    Lifting capacity of existing bridge crane

    See if the attached document helps.http://files.engineering.com/getfile.aspx?folder=23e2fd3c-5d6a-491b-8cde-a72f0f376867&file=Whiting_Crane_Handbook_-_Third_Edition.pdf
  3. CTW

    Snow Load Reduction due to Grating

    According to "Snow Loads on Non-Building Structures" (http://ascelibrary.org/doi/abs/10.1061/9780784412367.129), the authors state in reference to snow on grating that "balanced snow will accumulate on this surface just as it would on a checkered plate or any other continuous flooring material"...
  4. CTW

    Dowels to Transfer Large Wheel Loads

    SgtYui- I'm curious about the 3:1 chamfered edge on the existing slab. Do you know why it was constructed this way? Is the existing slab part of a building? The way it's reinforced at the edge looks like the slab may be integral with a grade beam.
  5. CTW

    Anchors with welded plates

    Section 5.5.3 of the attached document seems to support it. Section 5.5.4 states that if a termination plate is used, it should be small and circular. Keep in the mind the document was written for reciprocating compressors, but I imagine it's useful for most dynamic...
  6. CTW

    Rebar Corrosion

    Being 60 years old, it's not likely to be round bar. Possibly square or flat. See attached.http://files.engineering.com/getfile.aspx?folder=911dddcd-356c-43dc-9e0d-28aea95de01f&file=Reinforcing_Bar_Specificaitons_1911_thru_1968.pdf
  7. CTW

    Balcony Collapse in Berkley, CA

  8. CTW

    When to apply OHSA over IBC and ACSE

    It depends on the purpose of the stairs. Are they for access between floors of an office building, or machinery, or a mezzanine, etc.? Most of the time I've felt 1910.24 was fairly clear on when OSHA applies, but in cases where I felt there was a gray area, I've always used the most...
  9. CTW

    Gantry Beam Analysis

    See if this document helps you.http://files.engineering.com/getfile.aspx?folder=65795ba0-206c-4196-abb3-0aa2f9e914c1&file=Design_of_Monorail_Systems.pdf
  10. CTW

    Concrete

    Are there any photos of the footing before it was poured? Did you or anyone else inspect the reinforcing before it was poured? The cracks seem unusually wide for having (6)-#6 in a 5 ft wide footing, so I'm wondering if the reinforcing was placed according to the plans. These questions may be...
  11. CTW

    Stress Concentration

    Can you describe what you mean by "beefed up"?
  12. CTW

    Hoist Design

    My suggestion would be to start here. http://www.mhi.org/hmi
  13. CTW

    OSHA 5 to 1 factor of safey

    This qualifies as a below-the-hook lifting device and should follow the design recommendations in ASME BTH-1 Design of Below-the-Hook Lifting Devices. This document gives guidance on selecting the appropriate safety factor or design factor as it is referred to in BTH-1.
  14. CTW

    Steel Plate Distribution

    Which methods are you currently using?
  15. CTW

    Floor Plate with Wheel Load - Sanity Check

    Thanks BA. That's exactly my point. A 10' x 20' x 2" plate does sound a bit extreme. The original plan was to use a stiffened plate but I was just curious what thickness of plate would be required to span that distance. I guess I'll research to find out if there has been any real world...
  16. CTW

    Floor Plate with Wheel Load - Sanity Check

    I've used Roark's in the past for floor plates with relatively short spans and felt comfortable with the outcome. However, I could use a sanity check for the floor plate outlined below. The plate is 20 ft wide with a 10.2 ft span. Simply supported along the 20 ft edges only. The applied axle...
  17. CTW

    OHSA stair guard height requirements

    Not according to OSHA. But I thought I saw the 36" requirement somewhere too. 1910.23(e)(2) A stair railing shall be of construction similar to a standard railing but the vertical height shall be not more than 34 inches nor less than 30 inches from upper surface of top rail to surface of...
  18. CTW

    Crane Runway Beam | Cantilever & Splicing

    90 ft might not have been a good example to use as I believe some plate sizes are available in that length if memory serves me correctly.
  19. CTW

    Crane Runway Beam | Cantilever & Splicing

    I don't think there's a problem as long as you've covered all the details. But I'd suggest researching further to see if you can determine why most publications suggest not splicing a runway beam. If you find anything, please update this thread so that others can understand the reasoning as...
  20. CTW

    AVwin98 (previous thread)

    That's good to know. I've always wondered about that.

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