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Recent content by bertyboy

  1. bertyboy

    How quick will this pressured vessel vent

    I asked a question recently about how quick this pressured vessel will vent. I have attached a sketch :- Can someone show via some formula how long it will take to vent, or at lest drop half its pressure ? Thanks a lot !
  2. bertyboy

    Structure Lift Analysis Software

    Ussuri, I have found a good free spreadsheet program, Sling Pro, available from engineeringspreadsheets.co.uk that does 4 leg sling design in accordance with the major offshore codes. You select the code, then the load and apex angle then select the 3 components :- Master link assembly, wire...
  3. bertyboy

    Simple question about torqueing of stainless steel bolts

    I would like to know what the coefficient of friction u, and the nut factor k, is for a nut tightening on a bolt, for stainless steel, on stainless steel. I have not been able to find this value. For mild steel on mild steel, Gr 8.8 bolts :- u =0.15, and k = 0.2 If someone can clarify this...
  4. bertyboy

    Are there any good computer programs for 4 leg sling design ?

    I am a Structural Engineer, working in the offshore oil and gas industry. I am looking for a computer program that can design 4 leg slings, in accordance with the commonly used codes, in this industry. Can anyone tell me if there is such a computer program ? Thanks, Bert.
  5. bertyboy

    Simple Structural question, about section properties

    Trainguy, Revees111, and Vipe, thanks for your comments, they were all worthwhile ! I have definately learned something from this thread. Rob.
  6. bertyboy

    Simple Structural question, about section properties

    Apsix, thank you for your valuable post !!! That is indeed what I am asking ! Any shape can have a plastic neutral axis, and therefore a plastic Z value ( second moment of area ), but the question is, is it valid to use it for the case of angles.
  7. bertyboy

    Simple Structural question, about section properties

    Prex, thanks for your reply. I can see that the person that has written that small program has included the plastic nuetral axes. But this really still doesn't proove that they are permissable for use in angles. I was really wondering if the codes of practice, in the USA, or Europe, allow angles...
  8. bertyboy

    Simple Structural question, about section properties

    JAE, thanks for your reply. However, you didn't read the question properly. The question is, do angles have a plastic neutral axis, in addition to an elastic neutral axis ?
  9. bertyboy

    Simple Structural question, about section properties

    Can someone plese tell me whether an angle, i.e. a L shape has a plastic neutral axis. Because I have just used a program which gave ( second moment of areas ) Zpl,x & Zpl,y, as both equal to 0 ?
  10. bertyboy

    For AISC, which method, LRFD, or ASD, should one use ? ?

    Thanks for all your comments. The reason why I am so interested is because I am writing a spreadsheet, to do AISC ASD combined bending and compression design. You have all convinced me that the ASD design has still got a very good future. my opinions are as follows :- 1) Both our steel and...
  11. bertyboy

    For AISC, which method, LRFD, or ASD, should one use ? ?

    For AISC, which method, LRFD, or ASD, should one use ? I am a Structural Engineer in the oil and gas industry, in Aberdeen, Scotland, U.K. In this industry we use some of the American codes, e.g. the AISC codes. ASD is the allowable stress design. I have the 'green book', 9th edition, dated...
  12. bertyboy

    Spreadsheet for deriving plate girder section properties

    I have found a web site that has a great spreadsheet, for working out the section properties of a plate girder ( I, or T shapes ). The programe is top quality and very well presented. I frequently add the design sheet into my calcs. The web site is :- ( on the menu on the left side, go to...
  13. bertyboy

    Steel column design

    boo1, thanks for your advice. The program in the epcserver location, is not that useful for a structural enginner, but thanks anyway. Also Xcalcs.com, seems to be down at the moment.
  14. bertyboy

    Steel column design

    I am desperately looking for a combined bending and compression, column design spreadsheet, in accordance with the AISC codes. Previously someone referred me to the MITCalc website, however the spreadsheet on there is not very useful for a Structural Engineer. There must be people whom have...
  15. bertyboy

    4 leg lifting sling design and certification

    In Europe, 4 leg lifting slings are designed, and certified in accordance with BS EN 13414. In the USA, when a sling manufacturer produces a sling, does he stamp on the sling, that it is certified, in accordance with a particular code ?, if so what code is it ?
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