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  • Users: ChadV
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  1. ChadV

    FEA Analysis of a pipe support

    Also Janosik, you mentioned bonded contacts "exploding" in ANSYS. I don't know your particular case and wouldn't cast shade on the advice of ANSYS tech support, but it's worth mentioning that bonded contacts can "break" in some cases, counterintuitive as that may feel. ANSYS defines a contact...
  2. ChadV

    FEA Analysis of a pipe support

    Different application, but ASME VIII-2 (for pressure vessels and the like) has what's called limit-load analysis. You define your steel as linear elastic up to yield then perfectly plastic after yield (although practically you'll need to give it a small post-yield stiffness for convergence...
  3. ChadV

    FEA Analysis of a pipe support

    Echoing rb1957 that nonlinear geometry and materials, if you're not using them already, will get you closer to reality. You've probably combed through the manufacturer's catalogue already, but I've seen others (I'm thinking timber supports but might be misremembering) that actually describe what...
  4. ChadV

    development and lap length of rebar - is db nominal or actual diameter

    It's now Clause 3.3.3, no change to the text.
  5. ChadV

    Padeye Safety Factor

    Depends on where you are, but I'd think ASME BTH-1 should be applicable.
  6. ChadV

    Looking for a paper by Mete A. Sozen...

    SRE... thank you very kindly!
  7. ChadV

    Looking for a paper by Mete A. Sozen...

    Hello all, I'm looking for a paper that I used to have a PDF of, but I'm now unable to find either in my files or online. The title, as I recall, was "The Faustian and the Magian in the Building of a Building Code", or very similar, by Mete A. Sozen (who sadly passed away a couple of week ago...
  8. ChadV

    Verrückt water slide decapitation

    JedClampett, fel3, and others: thanks for the insight on the quite varied standards state-by-state! I'm wondering now about the structural part... it seems clear from the indictment that the supporting structure was designed by a P.E., but I'm curious the opinions of folks here... would you be...
  9. ChadV

    Verrückt water slide decapitation

    Echoing LittleInch and others... I'm not an expert in this area by any means, but I wondered how this could have happened without a building authority stepping in. Given that there was a qualified structural engineer involved, is it just a case where the building department sees there are sealed...
  10. ChadV

    Verrückt water slide decapitation

    Regarding the engineering, I read (either in a news story or in the indictment itself, I can't recall offhand) that an outside engineering company did the structural design, but the actual dynamics of the ride itself weren't really designed except by trial-and-error. Another complication of...
  11. ChadV

    Elliptical concrete column

    Cian_Lynch: I can't view your "calcs" attachment as it doesn't seem to have a file extension, but yes, what you describe is fundamentally what I was thinking. There are a lot of chances to make small errors in the spreadsheet, so it's good that you verified it against a software output as well.
  12. ChadV

    Elliptical concrete column

    Cian_Lynch: fair enough, particularly considering the relative simplicity of using software that can handle the problem... however I would note, the way I'm describing, you shouldn't need to do any 2D integration - for each horizontal strip you would get a single value of strain, convert to a...
  13. ChadV

    Elliptical concrete column

    You could also go really back-to-basics and do a spreadsheet considering the cross-section as a series of horizontal strips, with a small height to capture strain variation and a width calculated to match your elliptical shape. Rebar would be a set of points. You could iteratively solve for...
  14. ChadV

    Regarding log Normal distribution & response spectra for earthquake

    The attached file is a good intro to statistics used for seismic. Page 6 (actually page 12 of the PDF) has a nice little aside-box answering the question of why the lognormal distribution is used. I hope this...
  15. ChadV

    Salary Negotiation Failed Recent College Graduate

    I think I'm kicking a dead horse at this point but I'll echo everyone else: don't worry about it! Best of luck in your new job!
  16. ChadV

    A scaled finite element model

    This is way back in the sands of time for me, but I think the first step would be to list all input and response parameters for the full-sized problem and determine a reduced set of non-dimensional parameters from Buckingham's Pi Theorem (https://en.wikipedia.org/wiki/Buckingham_%CF%80_theorem)...
  17. ChadV

    Filtering Vibration Data

    I haven't used it but it appears you can do the Fourier transform pretty easily in Excel - see here. Saves a lot of pain in setting up the calculations yourself.
  18. ChadV

    Modern Steel Construction Steel Quiz

    Another independent peer review for anyone left in need of convincing...
  19. ChadV

    Strut and tie for "Deep Beam" above opening in foundation wall

    Thanks for the input folks! In response to a common thread - for sure there is a fair bit more assessment needed to make this actually work. I appreciate all the high-level comments to get a feel for whether the approach seems reasonable before diving in. BAretired - external reinforcement is...
  20. ChadV

    Hooked Anchor Side-Face Blowout

    Thanks WARose! What's your approach in checking the steel bending? I can see taking the pullout load (required to crush the concrete above the hook), distributing it along the hook and checking it as a cantilever, but this seems quite conservative. Is that the kind of check you're describing?

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