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  1. RobertoMiguel

    creating a hole in circular hollow cylinder

    It all depends, mostly on the level of detail you want. It sounds like you are modeling a boss, for lifting something through it. It this is a component in a larger structure, there is no need to be too accurate. However, if the boss is ALL you're modeling, you can get away from the...
  2. RobertoMiguel

    Does STAAD support several input files?

    ToohTah, have you tried merely updating your input file in a different write/read program? Since the STAAD input file is merely a script file (aka, text file), you can tool around in it from Notepad, (Microsoft) Word, etc, etc. This way you can just hit <Ctrl> H and Replace whatever line of...
  3. RobertoMiguel

    M020 release conditions

    I just want to chime in, because the forum closed the previous anti-Mathcad/PTC post, the one regarding incompatibility between M'Cad 13 and the 64-bit Vista OS (Re: thread552-193152). I'm a decades old Mathcad user that thought it was the best thing sinces sliced bread and now feel raped...
  4. RobertoMiguel

    Dynamic Impact Force from falling object on pavement

    Ok, I stand corrected then, single PI it is. This is such a beautiful solution. I can't believe it's this simple. I guess the only other thing left to discuss is the stiffness. Per the derivation, it should be the stiffness of the falling object. But, relativistically speaking, it should be...
  5. RobertoMiguel

    Dynamic Impact Force from falling object on pavement

    My apologies to Messrs Jobert and Locock (you too, Qshake). It took me a while to realize that Locock's inference is that the duration of the impact is tantamount to the period of the half sinewave. But, if this is true, wouldn't... t = (PI/2) x Sqrt(m/k) ...rather? In other words, only...
  6. RobertoMiguel

    Dynamic Impact Force from falling object on pavement

    I meant to say that this widely MIS-used factor of two is not applicable to most load drop cases. Read the caveats that accompany the derivation. The weight is being released at the top of the spring! Can't develop a great velocity that way, can we. Just do the numbers and you'll see the...
  7. RobertoMiguel

    Dynamic Impact Force from falling object on pavement

    The duration of impact bit has nothing to do w/ your initial conditions, including the height from which the object is dropping. This height is what determines the velocity just prior to impact and thus the fantastic deceleration that takes place when the dynamic object meets the more massive...
  8. RobertoMiguel

    Dynamic Impact Force from falling object on pavement

    Any reference behind that funky Delta-t equation? Maybe you guys are lawyers, bound by a client confidentiality agreement. But us, engineers (and reporters as well!) have to quote our sources. Roberto Sanabria
  9. RobertoMiguel

    hi all how can you calculate the

    If you were hoping for a simple equation you can throw at this, forget it. It depends on your loadings a great deal and you should have a few load combinations thrown in there, for good measure. So, sharpen the pencil and model that slab. Your FEA software should be able to map the...
  10. RobertoMiguel

    ACI 318-99 and 318-02 Anchorage to Concrete / Appendix D Discussion

    You might also want to check out ACI 349.2R-97, &quot;Embedment Design Examples&quot; (26 pgs). It's part of the nuclear safety-related structures ACI code. But, hey, I have seen no other industry w/ more complete documentation on this subject than the nuclear power folks. Probably because...
  11. RobertoMiguel

    Affirmative Action

    I guess I'll add my own two cents' worth to this discussion, if only to add my case to the tally. Affirmative Action was a big deal when I was in school (in Amherst, MA), it was present at hiring time for recent college grads, and then virtually non-existent throughout my professional (lack of...
  12. RobertoMiguel

    Atlas Shrugged - Ayn Rand

    These are all excellent recommendations and should be duly noted into a comprehensive Engineers' Reader compendium. Having said that, I can't believe no one's mentioned The One Minute Manager yet. It's probably the easiest and juiciest read in this whole list. It was from this book that I...
  13. RobertoMiguel

    STAAD output - FEA result sorting

    Your best bet is to copy and paste to Excel, then manipulate your data there. You can do this from the post-processor, w/o having to generate a report. On most post-processor tables, if you double-click the left-top corner, it'll select all data in the table. Then, on Excel, you can delete...
  14. RobertoMiguel

    Where can I download structural drawings?

    Some states' DOT agencies post their own in-house developed engineering aids such as beam/column splice tables. I think Ohio's DOT is a good one. Their standards are very useful.
  15. RobertoMiguel

    Beam End Forces Envelope

    You can just go on Post Processing Mode, click on the Beam tab on the left margin and then click on the Envelope tab on top of the Table section to the right. It'll list and sort all members. If you double-click on the top-left corner, it'll select everything. Then, you can right-click, Copy...
  16. RobertoMiguel

    What is maximum span for 18x8 steel beams

    Are you trying to say &quot;What's the maximum length that a single rolled unit of that size can be shipped in?&quot; This would make more sense, as a question.
  17. RobertoMiguel

    Wind and seismic stresses - increase in allowable buckling load

    You can avoid all this speculation by just &quot;normalizing&quot; the applied loads. In the Air Pollution Equipment industry we use a factor of 3/4 on load combinations containing one transient load (be that wind, seismic, or some excursion operating load) and a factor of 2/3 for combinations...

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