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  1. azcats

    Regarding expanded metal sheets

    We build a lot of 2' and 3' wide walkways with the 2.0 psf and 3.14 psf grating (respectively) using reverse diamond grating and spanning the width of the walkways. Doesn't require intermediate support that way. We've seen a few people make them similarly w/o the reverse diamond and they're...
  2. azcats

    Crazy cantilevered steel deck

    Not exactly a hot tub, but ...
  3. azcats

    Moment Frame on Asphalt / Wheels?

    I'd be interested in seeing how my structure reacted/deflected with the roller assumption and how much thrust it was actually resisting w/o the roller. My gut says use the roller or bracket the system w/ and w/o. If it's stable otherwise and you're comfortable w/ the loading atop the...
  4. azcats

    Crazy cantilevered steel deck

    Yes. 25 each. I ignored that tapered plate and put a single angle each end. I think that's how it was framed.
  5. azcats

    Crazy cantilevered steel deck

    100% on this. There's a lot of other flex in this system. Wonder if it's significant enough for fatigue to start cracking welds.
  6. azcats

    Crazy cantilevered steel deck

    I left everything fixed. The big reaction is about 25 kip-ft (ASD). Thrust force of about 6 kips. Some other weird internal moments with the fixity. I just tried releasing the torsion at the baseplate and it didn't impact much. Regarding the angle, I don't know that they make a 7x4...
  7. azcats

    Crazy cantilevered steel deck

    So I got bored... Caveats: Ignored tapers 60 psf LL 20 psf DL (plus self weight) No members are 'overstressed' per-se. 8x8 are in the high 80's. 12x4 is in the low 80's. I don't trust my risa skills enough with cantilevered members to really report on the double angle. Deflection over 2"...
  8. azcats

    Crazy cantilevered steel deck

    Wonder if the center has more or less flex than the ends? IE, how torsionally stiff is that 12 x 4 HSS? Maybe the small HSS at the end mitigates some of that. I share others' concerns about the AB size/embed. Also curious about the welding of the angle to the HSS.
  9. azcats

    Artificial Intelligence in Structural Engineering

    Sorry - Gemini.
  10. azcats

    Artificial Intelligence in Structural Engineering

    I've successfully used it to quickly generate complex, multi-layered if formulae in excel. Just kept feeding it a word salad of what I wanted and we eventually got it tailored to work perfectly. Done in 5 minutes what would have taken me an hour to organize the logic in excel myself.
  11. azcats

    Unable to obtain existing foundation drawings

    I have different thoughts on this depending on the use of the foundations. If they're primarily/only vertically loaded and the expected use is the same, I'd be more lenient than if they're part of some lateral system for a load they likely have not yet seen in their lifetime.
  12. azcats

    Wall sign on building

    If it's close to the building, see section 29.3.2.
  13. azcats

    Calculation of concrete foundation for steel fence

    IBC Section 1807.3 has the formulae. 1807.3.2.1 Note that the soil characteristic here is passive pressure - not vertical bearing. I'd expect to see something more like 200 psf/ft. Using that I get 5.78' deep...
  14. azcats

    Shearwall OT, does the moment arm start at top of wall or top of diaphragm?

    I'd generally put the wall height at the elevation of the drag strut or collector. And if that's the top plate at the top of wall, so be it. In that case you've probably (hopefully) got shear transfer from diaphragm to top plate the length of the wall. If not, I could be talked out of my...
  15. azcats

    Design method for rock bolts in shear

    I've not worked much with rock anchors - are they ever battered?
  16. azcats

    Foundation Stability Factors of Safety

    I've said it before on this subject, I do ignore the 0.6D combinations for soil pressure calculations on isolated foundations resisting overturning. I do ensure that any 0.9D combinations have a OT FoS of at least 1.5. And I ensure the structure is still stable at 0.6D combinations. These...
  17. azcats

    ACI 318: Side-Face Blowout (*sigh*)

    Side face blowout is more of a pseudo-pressure failure than a tensile cone failure. It appears as a cone-ish because of how it fails. If your scale is accurate I'd likely ignore based on it not really being a free edge and where the 'pressure' originates is well restrained by a significant...
  18. azcats

    Thank God for Sparkies

    Best wishes. ETA - Am I reading that you've been in the hospital for a month?
  19. azcats

    Phoenix Building Collapse in Microburst

    Appears that entire sections between GLB were pulled off and tossed aside. https://www.youtube.com/watch?v=kzHK8AHbqyY&t=49s
  20. azcats

    Phoenix Building Collapse in Microburst

    I'm betting uplift removed the diaphragm and any chance those walls had to stay standing. Those panelized roofs were spongy - worked on a couple of them right out of school in the early 90s. I don't remember considering uplift. 2x4 joists spanning 8'.

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