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  • Users: firai
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  1. firai

    IBC 1607.9 >100psf Live Load Reduction

    Unless your "roof" is occupied and designed as such, I don't see how you can count it as a floor for the reduction. Structural Design Engineer New York, NY
  2. firai

    Lateral force caused by gravity load

    Good catch; I stand corrected. ASCE 7 specifies 10psf as the minimum for most jurisdictions; 20psf is the minimum for the NYC code. Structural Design Engineer New York, NY
  3. firai

    Temporary Stage Collapse at Indiana State Fair

    The requirements depend highly on the local jurisdiction. I know some colleagues who specialize in stage work engineering, but there are surely many temporary structures out there that haven't been engineered, reviewed or inspected. As a side note, from a public safety point of view, I would...
  4. firai

    Welding both ends of the lintel to bearing plate

    We usually only put in 2 bolts/anchors at each end and try not to detail lintels to have a high fixity in general out of concern for expansion/contraction compatibility between the different materials, especially if it's a brick veneer/CMU backing system. Hope that helps. Structural Design...
  5. firai

    Alternative Basic Load Combinations

    My best guess would be that they were trying to keep the number of combinations down and weren't as concerned about capturing every possibility. Structural Design Engineer New York, NY
  6. firai

    Lateral force caused by gravity load

    It is very rare that neither wind nor earthquake would affect the anchorage or the design in some way. There are several minimum loads that apply: 1. For purely gravity loads, it depends on the out-of-plumbness (and out-of-straightness), which depends on the tolerance of the trade you're...
  7. firai

    Alternative Basic Load Combinations

    The next logical step would then be the same legal/ethical dilemma all over again: should you use the code-allowable combinations even though they're probably against your better judgment? I personally wouldn't feel comfortable doing so in this case. Structural Design Engineer New York, NY
  8. firai

    Alternative Basic Load Combinations

    The alternative combinations are taken from the 1997 UBC and definitely don't reflect the latest knowledge. I would suggest at least using the basic ASD combos instead to capture all the effects that you pointed out. Structural Design Engineer New York, NY
  9. firai

    Interesting kl/r question

    As others mentioned, the kl/r <= 200 has always been a suggestion. As with other engineering judgment rule-of-thumbs, it may essentially be applied however you want to apply it. With that said, if you're concerned about the slenderness for whatever reason, then the same criteria (including...
  10. firai

    Plate Girder Design with AISC 13th Edition

    ToadJones, I mentioned DM because in my humble opinion, figuring out an accurate-to-conservative force/moment to design the tapered member for and correctly accounting for the stiffness in the analysis is more difficult than actually designing the plate girder. I apologize if my comment caused...
  11. firai

    Plate Girder Design with AISC 13th Edition

    One of the main features of the AISC 360-05 was that it unified the provisions for rolled and built-up members, so the only chapter you need to look at when designing for flexure is F. With that said, you should refer to DG 25 for tapered members as others mentioned, which just came out. I...
  12. firai

    NYC License ?

    The city does not administer its own licensure requirements. However, as MiketheEngineer has noted, we have our own building code, which is essentially the UBC with local modifications. The DoB also has requirements for plans that may deviate from standard practice elsewhere. Finally, an...
  13. firai

    RPN Calculator App for iPhone 4

    PCalc's interface doesn't look the same, but it's about half as much. Like Mike said, there are many, many calc apps for iOS and at least half a dozen employ RPN. Just google or search on the Apple store. Structural Design Engineer New York, NY
  14. firai

    threaded rod allowable tensile stress

    I can't find any references to AISI 1010 in MSS-SP-58, but section 4.7 in the document specifies the 25% reduction that Hilti applied as you pointed out. Several different factors can contribute to safety factors much greater than typical structural specifications: - MSS-SP-58 (and presumably...
  15. firai

    enclosed structure - wind load basic question

    Sidewall pressures are in the code, and we know from large quantities of test data that it certainly exists, so there shouldn't be any reason not to consider it in some way. Now when I say consider it, it doesn't mean that you have you have necessarily add another several load cases and a dozen...
  16. firai

    CMU Wall Design

    We usually detail the plates to be on top of the CMU. In other words, the bottom of the plate is flush with the top of grout/CMU, and the joist seat is raised above the masonry by the plate thickness. SJI has a requirement for the bearing to be equal or less than 1/2in. from the face of the...
  17. firai

    Text on Direct Analsyis for Stability

    Again, please start another thread if you want to continue to discuss the background of the DM approach. In short, mixing stiffnesses from the frame analysis and the spec equations is inconsistent with the way they were derived, and this approach would give you erroneous results. Structural...
  18. firai

    Civil/Structural Engg unemployment rates

    Foreign engineers are generally more affordable, but U.S. offices still hold more prestige for the most part. Our firm has hired a few engineers in Asian offices, but we've hired almost just as many in the U.S. Although we seem to be a rare case in that regard. Structural Design Engineer New...
  19. firai

    Civil/Structural Engg unemployment rates

    I don't have any statistical evidence, but my anecdotal impression is that it is on par with or slightly higher than the average unemployment rate, or roughly about 1 in 10 looking for work. It also depends highly on locality and market segment. Again, anecdotal evidence suggests that domestic...
  20. firai

    Text on Direct Analsyis for Stability

    Just read the 2010 spec chapter C requirements and that's really all there is to it. You just need to make sure that you capture the following in your analysis: - geometric imperfections and out-of-plumbness (through notional loads or direct moving of the joints in the more critical direction)...

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