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  1. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    (Below is the ASME's opinion on the issue) Dear Mr. XXXX Please see below in bold letters the personal opinion of a committee member. Please note that since this is the personal opinion of a committee member, it is not endorsed by ASME. If you require a formal written interpretation, you...
  2. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Thank you Terio. I sent an email and will update the thread with any response.
  3. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Great post Dhengr, I agree... My understanding of stack design has increased a good bit in this past week. We so often get caught up in using templates and excel sheets that we forget we need to actually understand the math behind them. Yes, my wording was poor in regards to table C-36. (Page...
  4. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    I meant to add at the end of the bending calcs there is now no problem in satisfying the asme equation of P/A + MD/DI_section < Sbl when we use .66fy as the allow (or even .6 fy which we may do to be conservative_
  5. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Thank you all for the help and suggestions, I “believe” I have worked out a solution to the question of “what do you do when equation 4-6 is not satisfied?” Please let me know if the following reasoning makes sense When equation 4-6 is not satisfied design as follows. 1. Allowable...
  6. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Terio, i also had that thought... But what requirements do you check in the AISC? (its not like they have a steel stack design section) Also, if you get a chance to review the Gaylord scan, it appears that they do have formulas for all cases of D to T.. and as i explained above, it would limit...
  7. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    2nd attempt at the gaylord scan. The first did not seem to post. BRhttp://files.engineering.com/getfile.aspx?folder=61b9c95f-157d-4e96-a15e-53328e73bfb0&file=Gaylord-Steel_Stacks.pdf
  8. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Also, see attache Gaylord and Gaylord Steel Stacks. Notice the reference and similarities to the ASME.http://files.engineering.com/getfile.aspx?folder=b8bc44ce-ad8b-4b32-b348-68f2f0c00610&file=G_&_G_-_Steel_Stacks.pdf
  9. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Sorry for the confusion dhengr, see attached scan of the asme-sts1. Section 4.4 is what we have been discussing (in regards to design when eq 4-6 is not satisfied) Thanks again for the help and opinions. I think you are correct about contacting ASME about this, but im still hoping im missing...
  10. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Im starting to wonder if this is an ASME issue as more sources are showing similar results/equations: My head is spinning.. Gaylord & Gaylord, Struct. Eng. Handbook (3rd) -1990 page 30-8 (Chimneys) Steel stacks 9. Allowable Stresses: The allowable longitudinal compressive stresses due to...
  11. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Ill write a little more later (as it has been a hectic day), but perhaps these findings may spark some of your previous knowledge on the subject. In reviewing Troitsky (Tubular Steel Structures - Theory and Design) - Section 2.6 (Allowable Stresses) i find the following. (In Regards to local...
  12. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Thanks dhengr, I can assure you the formula of t/d <= 10FY/e is not miscopied. As far as it being a misprint, i have 2006, 2003, 2000 and an earlier version at my office and they all state the same exact formula. Your back-asswards thoughts are exactly what the senior structural guys i talked...
  13. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Yes JStephen. Section 4.4 of the ASME STS1 is for "Allowable stresses" The first sentance in 4.4 is as follows: "The following formulas for determining allowable stresses are applicable for circular stacks and liners provided that eq (4-6) is satisfied. They are as follows Case 4.4.1...
  14. hoots711

    Help on ASME-STS1 in regards to steel stack design.

    Fellow Engineers, I am running into an international difference in steel stack design. Per the ASME, STS-1, Section 4.4, Eq 4-6, allowable stress cases are only valid when equation 4.6 is satisfied. 4-6 states that t/D <= 10Fy/E basically, it limits your thickness based on diameter as Fy and E...
  15. hoots711

    Simple programming question.

    Ugggg, to use a if like this do all the items in the matrix have to be the same units of measure? Im getting an error that units dont match when I populate the matrix with different forumals. any ideas?
  16. hoots711

    Simple programming question.

    Thanks Greg. I think this will get me headed in the right direction
  17. hoots711

    Simple programming question.

    I have been looking all over the net and have been unable to accomplish something that would take 10 seconds in any programming language...HELP PLEASE simply, I need to run multiple commands if a value is true or false. Exampl if H < 5 x=2 y=9 gg=567 h.3=h.9 If H > 5 x=42 y=93 gg=23567...
  18. hoots711

    Sorting an array from lowest to highest.

    I have a array of 4 angles that I need to sort from lowest to highest example angl(4) angl.1 = 1.305 angl.2 = 1.272 angl.3 = 1.342 angl.4 = 1.31 I need to set the array to variables for lowest to highest. example 1st = angl.2 2nd = angl.1 3rd = angl.4 4th = angl.3 I have been messing aroudn...
  19. hoots711

    Newbie Mathcad Q

    Happy New year all. I have been instructed to convert some mathcad v11 documents to v8. (I think I was awarded this task simply becasue my machine has v11 installed) New to mathcad, and I quickly found the save as (v8) option. My simple question is: IS there a way to tell if the sheet had...

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