Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by JWB46

  1. JWB46

    Labyrinth weir design forces

    Any guidance on design forces for a reinforced concrete labyrinth weir would be very much appreciated. I will have data on flow velocities, height of water over weir etc. I know it's a complex subject... Thanks for any help.
  2. JWB46

    Cd & Cm for square section legs

    Hi guys, anyone got a reference for Cd & Cm for square section legs for a small jack up rig ? Thanks.
  3. JWB46

    guyed tower dynamics

    Thanks for replying. Yes, you are quite right there are typo's in several of the equations for K but I have sorted that out. The K values used for the example in the book are more or less correct. I have contacted Prof Irvine to see what he says and will post his reply in due course.
  4. JWB46

    guyed tower dynamics

    Thanks Josh, No, I'm not confusing weight and mass, though it's a common mistake as you rightly say ! I am using the data given in the book. Thing is, the result in the book looks suspicious anyway: a fundamental period of 0.43s for a 120m tall tower.
  5. JWB46

    guyed tower dynamics

    Hi guys (no pun intended) I have been reading up on guyed tower dynamics - lots of literature - excellent treatment given in 'Cable Structures' by Max Irvine. However, when I try to rework his Example 4.3 while my guy stiffness results agree pretty well with his and the mode shapes are exactly...
  6. JWB46

    API RP-2A WSD

    Hi Guys, I've been retired from the oil industry for a few years and now a bit out of touch but having to revive something for a design job. Is API RP-2A WSD still in use generally ? I think the last edition was 21st. Or is everyone using LRFD ? Any comments/ info would be very much...
  7. JWB46

    Offshore Jacket fabrication and installation

    Hello Sk90. They will certainly be available I would think. You could try amazon. Not sure which country you're in, but if you have a local engineering institution or university it might be an idea to try the library. The books are pretty well known. You could also try some of the oil industry...
  8. JWB46

    Preload anchor bolts on tall pressure vessels or similar structures?

    In my experience no. The bolts have to be tight, obviously, but I have not come across a requirement for pretension. Hope this helps. I'd be interested to see what others experience is.
  9. JWB46

    Offshore Jacket fabrication and installation

    The other ref is W.J.Graff 'Intro to Offshore Structures'
  10. JWB46

    Offshore Jacket fabrication and installation

    Have a look at Ben Gerwick's book 'offshore Construction' or something like that. There ios another ref but it's slipped my mind. I'll come back later. Hope this helps.
  11. JWB46

    what test loads for temp lift beams?

    You might also try BS 2853 'Design & testing of steel overhead runway beams'. It's very old (1957 I think) but has not been withdrawn and is still in use so far as I am aware.
  12. JWB46

    laterally bracing compression flange (short question)

    If yopu want a rule of thumb answer, stabilize the compression flange, not somewhere below it. Cheers, JWB46
  13. JWB46

    Impact Loading

    Hi Andyfabian. I think IRstuff and your boss are right. Let the kinetic energy be absorbed by strain energy in the cage structure. Better still if you treat the maximum possible velocity case as an extreme event, you can also take allowance for plastic deformation along with elastic strain...
  14. JWB46

    natural frequency of a radially compressed ring

    Hi Kumar, Yes you certainly started an interesting thread ! It looks even more like a glitch to me. The proportions of the structure are a bit unusual, but that shouldn't make any difference in the sort of eigenvalue analyses you're doing. I would suspect some kind of numerical problem in Algor...
  15. JWB46

    natural frequency of a radially compressed ring

    Thanks Englishmuffin! That's a very interesting answer to my last question. I would certainly agree your example is a structure and I daresay you could devise some kind of structural/mechanical system with the same sort of behaviour at large deflections. The classic case is post- buckling of a...
See more

Part and Inventory Search

Back
Top