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  1. hdn32

    Bracing of Wide Flange Beam

    @bones206: yes & by calculation. The beams would fail badly if those are not considered bracing points. @lexpatrie: Thank you! Do you have any info on the roof deck? (the building was built around 1964)
  2. hdn32

    Bracing of Wide Flange Beam

    Thank you for sharing your thought! Fyi, I am thinking of creating braced frames (between two joists, see below photo) at existing steel angle locations and use the frames to brace the beam. I would detail the connection to allow the joists to deflect vertically. Again, thank you!
  3. hdn32

    Bracing of Wide Flange Beam

    Hello fellow Engineer, Our office is asked to evaluate an existing roof framing structure that was modified previously due to the addition of a higher roof. Please see attached photos below. You will notice that, in order to handle the new drifting snow load, the following modifications were...
  4. hdn32

    Drifting Snow Load Questions

    @JAE: Thank you for your comments/ answers. 1. I agree with you about how the drifting snow should be calculated per ASCE 7. However, I still have a hard time making sense of it when comparing the calculated drifting snow loads of building with very steep (say 12:12) roof and that with flat...
  5. hdn32

    Drifting Snow Load Questions

    Hi everyone, When you have a chance, could you please take a look at my following questions and attached sketches (2 PDF files), and let me know your thought/ comments. • Code: ASCE 7-10 • Ground snow load: 50 psf • Ce = 1.0 • Ct = 1.0 • Is = 1.0 • Cs = 0.75 for 10:12 roof • Cs = 1.0 for 7:10...
  6. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    KootK: Thank you
  7. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    This is great :) The second point on my original post concerning of the lack of blocking between rafters for transferring shear load from diaphragm to shear wall when wind is parallel to ridge. For wind perpendicular to ridge, I do not concern about the connection between diaphragm and shear...
  8. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    jayrod: yes
  9. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    Koots: You are correct. I did not think about that. Have you tried to compare the unit shear = [chord force (T = C = M/W) / building length] with the shear flow using the beam equation abobe?
  10. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    @jayrod: yes you are correct. But the distribution of shear from diaphragm to which shear walls would depend on diaphragm types.
  11. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    Flexible diaphragm (wood) does not distribute shear to (perpendicular to load direction) shear walls. Hence there is no shear that direction. One will not design wood shear wall (in plane shear) for wind perpendicular to shear wall. Rigid diaphragm: yes
  12. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    Yes I totally agree with you on horizontal shear in beam and am familiar with it (especially when designing built-up girder and/or reinforcing existing I-beam with plates) However, we are talking about diaphragm and horizontal beam is its analogy. I am not sure if it is appropriate to utilize...
  13. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    Kookt, I have just click to "submit post" while intending to "preview". If that the case, the concerned unit shear would equal V/(building length)? and if the building length is not significant shorter than "W", then it should not of a concern. Just my 2 cent
  14. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    KootK, Could you please elaborate that a little more? A mark-up on my sketch wood be better. I thought the FBD on the left of my sketch suffices to demonstrate my point of not worrying about the little gap at the ridge (due to ridge vent). Is it the unit shear (parallel to the ridge, at or...
  15. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    Please see attached sketchhttp://files.engineering.com/getfile.aspx?folder=df92c3b7-803b-434d-bb9a-06f4d92f5c02&file=IMG_20180319_140152[1].jpg
  16. hdn32

    Wood Gable Roof Diaphragm & Connections to Shear Wall (Revisit)

    Dear fellow Engineers, I am new with wood design in general. While trying to put together details for roof diaphragm to shear wall connections, I have some questions about the topic. Thru my research in this forum, I found these two terrific threads (thread507-388238 and thread507-285903)...
  17. hdn32

    Spiral Shear Anchor Capacity

    MotorCity: Thank you very much.
  18. hdn32

    Spiral Shear Anchor Capacity

    Thanks Tmoose. However, I was not be able to find that paper online. Page 50-12 of Bridge Engineering Handbook (Wai-Fah Chen, Lian Duan) points to AASHTO Specifications 1957 to 1968 for the formula. But I have not have any luck finding the older AASHTO specs online yet.
  19. hdn32

    Spiral Shear Anchor Capacity

    Good morning, I am checking an existing bridge (reinforced concrete deck, welded girder with spiral shear anchor) for capacity to support construction equipment. Record drawings (dated July 1955) show that spiral shear anchors were used. Does anyone know and/or have any literature on capacity...
  20. hdn32

    Baseball Field Netting Cable Tensions

    Structuralengr89, You are welcome. You can find additional info at this link http://www.powline.com/products.html Good luck with your project, hdn32

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