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Recent content by sigma1

  1. sigma1

    1000 DEG F on CS A53 Pipe

    Well it was originally schedule 40. However, they installed schedule 10 and I was asked to verify the stresses at the supports for the new thickness. Schedule 10 fails and stiffening is required. B31.1 does not even show an allowable for that temperature. Is there any other source that we can...
  2. sigma1

    1000 DEG F on CS A53 Pipe

    Is it acceptable to use A53 CS pipe for a generator exhaust at approx. 1000 F or some type of alloy has to be used? Thank you
  3. sigma1

    Is the title "Civil" engineer used in lieu of "Army" enginee

    Does anyone know why the profession of Civil Engineering is called “CIVIL”. I don’t buy the argument that the British used it to describe civilian in lieu of “army” engineer. In Greek Civil is called "Politikos". "Politis" menas "Citizen" and "Politikos" politician.....
  4. sigma1

    Special Wood Connectors

    Is there a MNFR for special connectors other than Simpson Strong Tie? We have some weird connections and we like to avoid designing and fabricating special hangers & connectors. Thank you
  5. sigma1

    Can a seat connection (stiffened or not) resist torsion?

    Thanks phuduhudu If that is what we want, I dont see a problem replacing it with a double clip angle connection. I was just concerned of what will happen to the beam when the pipe starts moving. Is it going to remain vertical or it will start twisting? However, I tend to agree with...
  6. sigma1

    Can a seat connection (stiffened or not) resist torsion?

    Thanks JedClampett. The connections has been made with a thick top angle bolted to concrete with two (2) anchor bolts and not the otional side clip. However, I am planing to add a stiffener to the seat angle between the bottom concrete anchor bolts. Flexibility of the connection is not that...
  7. sigma1

    Can a seat connection (stiffened or not) resist torsion?

    I have a beam spaning between two columns 14 OC that supports two (2) pipes. The pipes move due to thermal expansion and contraction and even thought the friction has been reduced, it is still high enough to induce some torsion. The question is: Can a stiffened or unstifenned beam connection...
  8. sigma1

    Structural intergity of concrete after a fire

    Will heat generated from a house fire change the structural properties of the concrete significantly enough to cause concern?
  9. sigma1

    when do you go to the state board

    I know how you feel. I have come across the same problem on many occasions and there is not much I can do but pray that nothing will happens that will affect my work. By the way - I dont think the reports are anonymous and for a good reason. Good luck staying away from those
  10. sigma1

    Surge Analysis - Water Hammer

    Is there a softaware available that can perform surge or water hammer analysis? Thank you
  11. sigma1

    Plate Modeling

    I have a composite tube column (fab'd from plates) that I would like to clamp down with B-B channels during the concrete placement. The clamps (ties) are not welded to the plate column. I have modeled the plate but I am having dificulty with the clamp (B-B Channels)because it is only capable of...
  12. sigma1

    Grout behind wall plates

    Is there a min/max thicknes of grout that we can place behind a wall plate supporting a cantiliver beam with relatively small loading? When does bending on the anchors becomes a problem? Thanks
  13. sigma1

    "Jaked Piles"

    Any information or link on "Jacked Piles" will be appreciated. Thank you
  14. sigma1

    Composite Beam w/Formed Steel deck

    According to AISC 9th edition (ASD) section "I5" concrete below the top of the steel deck shall be neglected when determining section properties and in calculating "Ac" for Equation (I4-1).However, the manual is not clear about the location of the concrete NA. In other words, is the rib height...
  15. sigma1

    Signing and Sealing Drawings Prepared by Others

    Sometimes I also certify drawings that were prepared by a the Misc, metals detailer/draftsman. However, I do perform all the necessary checks and calculations. Most of the time teh drawings have to be revised based on my comments. Does this qualify under "direct supervision" or I am also a...
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