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  1. jtx

    Prevent RISA-3D from Defining a Diaphragm from RISA Floor

    Awesome...Thanks for the tips, Josh!
  2. jtx

    Prevent RISA-3D from Defining a Diaphragm from RISA Floor

    I'm working on a very preliminary analysis on a new single story structural steel building with a metal deck roof. My intentions for the building when I get into final design is to utilize horizontal roof bracing and vertical bracing in the walls. I don't want to use the metal deck as a...
  3. jtx

    AISC 341 and two-story x bracing

    "Yes, but the 4sqrt(E/Fy) slenderness limit does not apply for X-bracing, only for chevron" True. But consider how a two-story brace is formed, by mirroring a chevron brace about a beam so that it forms an "X" over two-stories. In an X-braced frame, where the "X" is within each story, the...
  4. jtx

    AISC 341 and two-story x bracing

    Would make sense to me. The effective length of the brace is the same whether it's in a chevron configuration or two-story brace configuration.
  5. jtx

    Analyzing an existing steel column encased with concrete

    Taking a shot in the dark.... Do you need the contribution from the concrete to make the columns work? Being that the building was constructed in the 50's, is it possible that the steel columns are robust enough to take the gravity and lateral loads themselves? Without adequate concrete...
  6. jtx

    who doesn't use manual computations anymore?

    Just my two cents... I guess you can consider me a "youngster." I'm in my early thirties, but I'm no spring chicken, either. I echo the sentements of many of the engineers that have commented, including the engineers who are over 50. I use computer analysis software almost on a daily basis...
  7. jtx

    Masonry lintel span tables

    I think the attached is what you are looking for... http://www.ncmaetek.org/map_pages/state_finder.cfm Also, the above website will take you to the the TEK manual. Just tell it what state you are in, pick a block mfr, and you should have access to the whole TEK...
  8. jtx

    "Watering Down" the S.E.

    FWIW...The pass rate for the first run of the 16hr SE exam is 27% http://www.ncees.org/Exams/SE_exam.php I think it's safe to say that the new SE exam isn't watered down and safe to use in CA, WA, OR, HI, IL, etc... Also I wish to bid most of you (PMR06, Teguci, a2mfk, and others) an AMEN for...
  9. jtx

    Transverse Stiffeners - Torsion

    I would think you could still use AISC design guide #9. The only thing is you would have to figure out what J and Cw are. I am not sure if they are in the 13th edition manual, but a descent software program that analyzes cross-sectional shapes should be able to give these to you.
  10. jtx

    Galvanized Steel vs. Stainless Steel with epoxy anchors

    The link below, I think, definitively answers this question. As long as you are using 300 series stainless steel anchors, you should be fine in terms of corrosion by dissimilar metals. http://www.galvanizeit.org/images/uploads/drGalv/HDG_stainless_steel.pdf
  11. jtx

    Transverse Stiffeners - Torsion

    Since this is such an interesting and polarizing topic with different opinions shared by everone here, I asked the AISC Steel Solution Center to see what they think. When I get a response, I will post it here.
  12. jtx

    Galvanized Steel vs. Stainless Steel with epoxy anchors

    I've used stainless fasteners to connect dissimilar metals before without any problems so you could use the stainless rods provided that you design the anchors properly. As far as galvanizing the anchor rods and it's ability to bond to the epoxy...that may be a question for your local Hilti rep.
  13. jtx

    Transverse Stiffeners - Torsion

    Slickdeals: Full depth stiffeners assuming they are connected to both flanges and the web, leaving one side unsupported.
  14. jtx

    Transverse Stiffeners - Torsion

    I think the issue is trying to resolve the shear flow in the flanges that's induced by torsion. The shear flow in flanges flow in opposite directions creating a couple acting about the shear center of the beam. In order to resist the torsion, you need to resist the shear flow couple that...
  15. jtx

    Offset HSS Header Connection Detail

    Could you fasten the HSS header to the underside of the WF outrigger bottom flange using a couple of Lindapter bolts instead of stripping the flange and field welding the plates to the WF? Also, could you use a larger angle that has a long enough leg to weld to the bottom of the HSS instead of...
  16. jtx

    notched flange in I Joist

    Let alone this happening!!! http://www.osha.gov/OshDoc/data_FatalFacts/f-facts48.html
  17. jtx

    notched flange in I Joist

    It may also be a good idea to adhere plywood to either side of the web to reinforce it for bearing. That may take care of your concerns about shear as well. Again...get direction from the mfr.
  18. jtx

    notched flange in I Joist

    Get a hold of the joist manufacturer about this. They should be able to assist you. BTW I have always seen joists run over the steel beam (I am assuming this is for a floor). What are you trying to accomplish by seating the joist on the bottom flange?
  19. jtx

    Required Drawing Information

    Check with the administration section of the State's building code. Any state plan requirements should be listed there.
  20. jtx

    Simplicity Approaching Functional Perfection

    As I sit here, suffering from insomnia on a weekend, I offer these thoughts.... During school, I tried to take every possible structural engineering course that I could in order to prepare me for work the real world. Did it help? I'll let you know when I retire. Fortunate for me that the...

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