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  1. Nate2017

    Metal deck diaphragm shear transfer at ridge of a gable roof with open web steel joist.

    Hi BAretired, thank you for your input. Please see my response in red. The detail seems excessive to me. There is no need for a continuous HSS above the WF. And there is no need for a continuous bent plate. Each joist shoe can be detailed to prevent rollover. Per "Designing with Vulcraft 3rd...
  2. Nate2017

    Metal deck diaphragm shear transfer at ridge of a gable roof with open web steel joist.

    Greetings to all. I am currently designing a steel framed building with metal roof deck supported by open web steel joist. The roof has a gable profile. The steel joist is spaced at 10 ft and sitting on wide flange girders. Based on my quick calculation, the rollover strength is not enough to...
  3. Nate2017

    rotated layout steel frameing orientation

    Thanks guys for your input. If I go with option A and have braced frames in the main orthagonal directions as lateral system, should I add some moment frames in the rotate portion to stiffen up the local area?
  4. Nate2017

    rotated layout steel frameing orientation

    Hi fellow steel framing gurus, how would you frame out the shaded area in the follow sketch? Would it be better to rotate the framing at that local area to align with the layout? I am leaning towards option b with orthogonal framings. I am not sure what the standard practice is to handle this...
  5. Nate2017

    HSS through bolt capacity

    The connection I am designing is a truss type connection. The HSS tube is sandwiched between two plates where bolt goes through all of them. I think it is equally loaded thus "t" should be doubled to reflect both walls.
  6. Nate2017

    HSS through bolt capacity

    Lomarandil, thank you for the clarification.
  7. Nate2017

    HSS through bolt capacity

    Thanks Mike. No I am not referring single shear vs. double shear of bolt. I am talking about the bearing capacity predicted by 1.8FyApb. Does that only refer to bearing capacity of one side of HSS wall?
  8. Nate2017

    HSS through bolt capacity

    I am designing a HSS through bolt connection only subject to shear. AISC eq. 7-15 and spec. J7 give the equation to predict the bearing strength of HSS through bolt holes. Does anyone know if the bearing capacity given by 1.8FyApb or 1.8nFydt refer to only one side of HSS wall? In another...
  9. Nate2017

    Direct analysis of braced frame columns

    Thanks KootK. I thought I missed something in the equation. At least you confirmed my speculation about the DAM. As I recall, the AISC 2010 states that the overall structural stability calculations can be dropped in some of the member strength check provisions if DAM was employed. But the...
  10. Nate2017

    Direct analysis of braced frame columns

    Hello everyone, I have recently studied direct analysis method introduced in AISC 2005. After reading lots of materials, I still have questions on my mind regarding situations where compression members have effective length factor k < 1. For example, the columns in a fully braced frame...

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