Continue to Site

Eng-Tips is the largest engineering community on the Internet

Intelligent Work Forums for Engineering Professionals

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

Search results for query: *

  1. IH1980

    Welded portal frame connections

    Yes - having read what Blodgett has to say on it, i think i will be asking them to weld up a diagonal stiffener across the eaves mitre line and a vertical one at the apex. After all they'll be grinding off the existing cleats for the rails to weld new ones on so it shouldnt be a big deal.
  2. IH1980

    Welded portal frame connections

    Apologies for going missing on my own thread, got dragged into fighting a different fire as you do. Can't believe I didnt think to check Blodgett, i even used it for something else this week. I'll start there - amazingly a second instance of this has come up this week, what are the chances..
  3. IH1980

    Welded portal frame connections

    Hi all, Hopefully someone can help me (or confirm what I already think i know). I am running an assessment on an existing steel portal which has been taken down and is being erected in a new location. The apex and the eaves, rather than being bolted, are welded like the image below - there is a...
  4. IH1980

    Formula rearranging!

    Thanks - always the same for me with algebra, when someone points it out its blindingly obvious!
  5. IH1980

    Formula rearranging!

    I'm hoping someone can help me with this, I am stumped. I have some calcs to check, relating to a falling body onto a wire suspended platform. The aim is to check the equivalent impact force (P) in the wire. The calcs go as follows, and I can't figure out how the formula has been re-arranged...
  6. IH1980

    'Structure' becoming dynamic under wind load?

    Some great advice here guys, it is all appreciated. To just comment on a few points: P delta checks - agreed. When I take it 'to the computer' I will make sure the analysis is second order. At this stage I am trying to lay it out by hand so that I know that the answers that come out of the pc...
  7. IH1980

    'Structure' becoming dynamic under wind load?

    Hi all. I have a problem I need some advice on. I am designing a thing for a client where they are installing a truck on top of a totem pole outside their truck factory, as a feature at the entrance. So this thing will be a 6000Kg truck tilted at 30 degrees (as if driving down a hill) on top of...
  8. IH1980

    Can this be solved by statics?

    The software used in the screenshots I posted is Robot Structural Analysis from Autodesk.
  9. IH1980

    Can this be solved by statics?

    Doug, I have only just noticed your reply and thought I would acknowledge your effort in writing the spreadsheet to check it out for me - really appreciated, thanks. I've downloaded it and will be giving it a once over, I've wanted to pick up a few tips on programming the stiffness method so it...
  10. IH1980

    Can this be solved by statics?

    Self weight is off! I'm glad that at least I have the analysis principle right now. Being out by a kN is not a big deal but i'd be worried if I was dealing with forces an order of magnitude greater. And the appreciation for not believing the computer is appreciated!
  11. IH1980

    Can this be solved by statics?

    Second screen grab attached.http://files.engineering.com/getfile.aspx?folder=dda32e3b-7e8b-467b-b497-aa56fe86f1f8&file=2130_x_2000.png
  12. IH1980

    Can this be solved by statics?

    OK, so I thought I had cracked it. Attached is my work through of the example posted previous - the results come out pretty close. To be extra sure I ran a second check and I got different answers to 'the machine'! I will put the screen grab from Robot in the next post as I can only add one file...
  13. IH1980

    Can this be solved by statics?

    True, perhaps I am a bit hasty in calling it wrong. It is after all 99% of the software analysis which is more than close enough! Also when I work out F2 using 16.4 x cos 47.54 i get 11.08kN which again is 99%. My 'problem' with it is that I think the vertical component of reaction at 4 is...
  14. IH1980

    Can this be solved by statics?

    Ok, I am not to proud to admit I am being an idiot. I have attached how I would go about this and perhaps someone can point out the obvious! I have drawn out the geometry in the top half. At the bottom, I have started with N4 and immediately get it wrong - I know it wrong because I have a...
  15. IH1980

    Can this be solved by statics?

    Correct, its a hinge. And now I am definitely off to bed...
  16. IH1980

    Can this be solved by statics?

    1 and 2 are two different members. They will be connected at Node 3. In my time zone its late so I will go through the responses you all have very kindly given me in the morning and respond.
  17. IH1980

    Can this be solved by statics?

    I was thinking that too, but you can change the pin at 1 for an X-axis only restraint without changing the results of the computer analysis, leaving three unknowns - Hz at 1 and Vt at 3 and 4? (Have only just done this since the OP by the way!)
  18. IH1980

    Can this be solved by statics?

    I am tying myself up in knots with this one. I have a system like the picture to assess. There are a variety of geometric configurations so i was planning to plug it all into a spreadsheet, but I am not happy that I am programming it right. So, I modelled one scenario and I cannot mirror the...
  19. IH1980

    USA Steel Design Codes

    Thanks for all the help - the links posted are really useful.
  20. IH1980

    USA Steel Design Codes

    Thanks guys - the work is a generic check of a specific component to be used within a scaffold system, thus is independent of location. I will need to review the relevant scaffold codes of course, but it sounds like from what was said above the AISC spec for structural steel buildings is a good...

Part and Inventory Search

Top