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  • Users: stillfan
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  1. stillfan

    Stability analysis - European codes vs US codes

    Thank you, this will help alot. The first thing I see at a glance is that they have a diagram with both flanges braced of the I-beam. Now I know if it is a compact section it won't be a concern but the aluminuim I am working with is slender and even though it is a box beam/column it is...
  2. stillfan

    Stability analysis - European codes vs US codes

    I am running through some calculations on an aluminum structure. In the longitudinal direction it is a braced frame and the lateral direction it is a moment frame. The frame is not the typical column/ beam connection. The column I believe would be what they refer to as a lean to. Where it is a...
  3. stillfan

    Internal suction on building fabric wall due to exhaust fans

    Willard3, I love how you assume that I have not contacted another engineer. Is that not another area of ethics, that you should not assume! You must know everything in detail before you accuse someone of being unethical. I have in fact contacted another engineer who actually designed the system...
  4. stillfan

    Internal suction on building fabric wall due to exhaust fans

    To be quite honest with you. I don't know what the pressure drop is. How would I determine this?
  5. stillfan

    Internal suction on building fabric wall due to exhaust fans

    I have a situation where the one side of a fabric building wall is seeing suction when the exhaust fans are running. The wall seeing the suction is opposite of the exhaust fans. There is a hybrid system being used in that the supply is natural and the exhaust is mechanical. I feel like the...
  6. stillfan

    Who is responsible

    BAretired, thank you that is exactly what I found. IIB is noncombustible material with no specific fire rating, IIIB must have a designated fire rating. Basically the site has another building that is within 5ft of our structure and they are trying to consolidate the buildings so they don't need...
  7. stillfan

    Who is responsible

    I have a contractor telling me that I am responsible as the structural engineer for determining if we can switch from a IIB construction type to a IIIB. Is this correct, I see this as an architectural item, aside for designing the structural members for any loading due to fire.
  8. stillfan

    Construction type and fire rating

    We currently have a building that is classified as a construction type IIB, the client wants to change it to a IIIB because he has another structure sitting 5ft away that has a type IIIB classification. The code official told him to just make our building (IIB) a IIIB structure my question stems...
  9. stillfan

    Slip Critical connection - ?

    It is a bearing connection. The load that enduces a moment, in detail 2 is from a vertical column. This then is fit up to the pipe section in detail 1. The inside diameter is 1.06, a 1" bolt is then inserted through the pipes and torqued to requirements. So yes it is so that a fixed connection...
  10. stillfan

    Slip Critical connection - ?

    Follow the link for a sketch. Thank youhttp://files.engineering.com/getfile.aspx?folder=7a6b0548-340b-4e42-910e-274d2e0ed099&file=doc00353020120919095307.pdf
  11. stillfan

    Slip Critical connection - ?

    I have a connection where a 3" long cantilevered plate is loaded 2.5" out causing a moment force on the connection point. The connection point is a round tube that sits between two other round tubes. There is one bolt that makes the connection. So the connection appears to be a pinned connection...
  12. stillfan

    Fabric Building Design

    What type of fabric structures are you looking at? Air inflated,Tensioned, architectural, temporary, or permanent? I myself work with tensioned fabric structures and would be happy to help you with any questions you may have. The ASCE has just released a new book ASCE 55-10 that may help you...
  13. stillfan

    Fabric Building Design

    The FSA or IFAI hold conventions with classes that will provide you CEC. The website is http://www.ifai.com/.
  14. stillfan

    Energy Code - Thermal breaks

    I have a question regarding Thermal breaks on Steel buildings. I am not sure if a mechanical engineer usually deals with this but since it affects R values and hvac performance I figure that it would be a HVAC topic. If you have a steel building with roof and walls with R values of r-30, instead...
  15. stillfan

    Free air space - code requirements

    She - and yes, I am speaking of a passive/ natural air system. When I size my intake and exhaust louvers for a passive system it only uses free air specs so I need to calculate my req free area based on the ASHRAE code. For example, on a residential crawlspace you have to meet a min req free...
  16. stillfan

    Free air space - code requirements

    I was hoping soemeone could point me in the direction of where in ASHRAE does it dictate free air space requirment calculations. I ran the calcs for CFM but the client wishes to install a passive system. So the CFM calc means nothing, right? CFM = Volume *3/60 (3ACH/60min/hr) = 80CFM
  17. stillfan

    material specification substitution of S355 for A572 grade 50 question

    Yeah, there are additional characters but they all have relatively the same chemical composition and they didn't give me these characters so I was just assuming worst case scenario where there are larger discrepancies btwn the two materials. Thank you all.
  18. stillfan

    material specification substitution of S355 for A572 grade 50 question

    I did compare the two and found the differences as noted above. My question as to rather the chemical composition of the S355 having a Mn content of nearly .25% more than the A572 is still in question. Also the Si,Cu and N values of the S355 are higher than the A572. I am not sure what the...
  19. stillfan

    material specification substitution of S355 for A572 grade 50 question

    My international supplier is substituting S355 for A572 grade 50 that was originally specified. I am running through the properties and noticed that the S355 has higher Mn, Si, Cu and N values at 1.6%, .55max,.55max,.012max (respectively) compared to 1.35%, .40,0,0. I believe this is a...
  20. stillfan

    Identification of Steel

    Thank you qcrobert, So the Id doesn't necesarly have to be a grade, it could be a code that the fabricator has on record. For example, they could use F for the ID and as long as they have a log of what the F represents ie; grade A500 steel. They would be compliant?

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