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  1. 271828

    Shear Lag

    Mike, I stand corrected on this being a hard limit. I agree with your interpretation. In the following article, Packer had a chance to say it's a limit, but he didn't. He said "This limited information tends to discourage connections with Lw < H or D." It's not clear if "this limited...
  2. 271828

    Shear Lag

    Or intermittent welds? I've done that before.
  3. 271828

    Shear Lag

    Assuming Fu = 65 ksi and a 7/16 in. slot width. With 6 in. long welds, I'm getting a tensile rupture design strength of 176 kips. That's a pretty good margin, with Ru/phiRn = 0.568. I'd still recommend not going with a length < 10 in. due to the problems described below. (If the tensile load...
  4. 271828

    Shear Lag

    That's not how this is typically done in AISC. If the connected part has a significant tension, it's checked for tensile rupture. That requires the effective area, Ae, to be determined, which requires the shear lag factor, U, for a case like this. If the connection had 140k compression and 10...
  5. 271828

    The dangers of software and code changes

    A W18x35 has Ix = 510 in.^4. That is a lot of mm^4 and a tiny number of m^4 ! With USC units, I need scientific notation about twice a year. Lol
  6. 271828

    One Drive - Am I the Last Person Using Dropbox for Business

    I switched to sync.com also. I'm pretty happy with it. I'm the only person here, so I am the IT/cybersecurity department for my operation. It bugged me that DropBox (same with Google and MS) are not end-to-end encrypted and zero-knowledge -- like sync.com is. I'm not exactly going drug deals...
  7. 271828

    One Drive - Am I the Last Person Using Dropbox for Business

    I used Dropbox until a couple of years ago. It worked fine. I switched to a end-to-end encrypted cloud. I find OneDrive to be pretty irritating.
  8. 271828

    Vibration isolation

    Contact Kinetics Noise Control and see if they have any ideas. Spring isolators at the unit will probably be the answer.
  9. 271828

    The beam is too deep Mr. Engineer

    That was my first thought. If the potentially notched beam is strong enough, I might go for it. Deflection might still be ok or close to ok with only a door sized segment with reduced EI.
  10. 271828

    Darn Architects!

    Those 2x6 posts will look ridiculous, like an accident. And that's if they're perfectly straight, not with some sweep like others have mentioned above.
  11. 271828

    Illinois Structural Engineer Stamps

    https://www.pestamps.com/ These guys are awesome. The other day, I needed JPG seal and they sent it in under an hour.
  12. 271828

    Artificial Intelligence in Structural Engineering

    My concern is for the long term state of technical knowledge in the profession. For decades, firms have employed and developed a lot of new guys. That's a big part of how knowledge is spread down the line. There's probably a critical amount of new blood that's required to keep the profession...
  13. 271828

    Artificial Intelligence in Structural Engineering

    What's "it"? Several programs have been mentioned. LOL
  14. 271828

    AISC Design Guide 16 Question

    That's part of it. See below.
  15. 271828

    Lateral Torsional Buckling of Thin Beam

    Deleted. Sorry, spoke too soon.
  16. 271828

    Things you love/hate with mathcad

    Stick, Thanks so much for helping with the default math format. I have a custom template, so that issue is totally fixed. 271828
  17. 271828

    Maple flow

    I tried Maple Flow about 18 months ago. I really wanted to like it, but gave up after the free trial period. It was a very primitive attempt at being Mathcad. Lots of operations took many more keystrokes and mouse clicks than MC does, which is saying something because MC isn't super great at...
  18. 271828

    Things you love/hate with mathcad

    A few other gripes. (The positives are pretty obvious, so the motivation behind listing gripes is to encourage competitors to not do these things. There seems like little hope PTC will be responsive. Also, maybe I'm wrong about some of these and there is a way to do them in MCP. If so, I'd love...
  19. 271828

    Things you love/hate with mathcad

    I've been using MC prime a lot for the last 18 months. In general, I like it, and use it a lot. Biggest gripe: no way to see the same sheet in a split screen or multiple windows. Utterly f'ing ridiculous in 2025. Second biggest gripe: The keyboard shortcut for subscript went from . to Ctrl -...
  20. 271828

    Things you love/hate with mathcad

    I tried Maple Flow. It is a faint shadow of Mathcad. I really wanted to like it.

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