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Recent content by 271828

  1. 271828

    Vibration of WF Beam Girders Supporting Steel Joists for Banquet Hall

    I don't think there's any way to answer your last sentence, other than to guess. You might get lucky and then again you might not. I'd make sure my floor is satisfies the check. The Chapter 5 rhythmic groups method has been around a long time. The industry has about 30 years of experience with it.
  2. 271828

    Vibration of WF Beam Girders Supporting Steel Joists for Banquet Hall

    Natural frequency is overwhelmingly dominant for rhythmic groups. 5.19 Hz isn't very high. The second harmonic of the force is up to 5.4 Hz according to Design Guide 11 Table 5-2. If you can get the natural frequency a bit above 5.4 Hz, you'll have a decent shot. You could try to make the...
  3. 271828

    Digital Seal and Signature

    When I read this, it reminded me of Better Call Saul when Jimmy doctored his brother's legal paperwork. I know that was totally off-topic and not helpful to the current conversation. LOL
  4. 271828

    Compact, non compact section properties as per AISC 2005

    The next question is whether STAAD correctly handled a section with slender elements. The default assumption is it does not. Verify before relying on its results.
  5. 271828

    Valid Pin Boundary Condition?

    It would be interesting to see the moment diagram if you rerun this with fixed bases.
  6. 271828

    Valid Pin Boundary Condition?

    The critical force effect in most frames like the OP's would be the moment at the top of the column, and a fixed base assumption just made that a lot smaller. Thus, you need to show the base plate is thick enough to justify fixed. What's the method for that? Note that for flush moment end...
  7. 271828

    Valid Pin Boundary Condition?

    How would you model and design the base plate in the OP's case?
  8. 271828

    Valid Pin Boundary Condition?

    With realistic stiffness at the left base plate, the left column would have a small moment at the base and slightly less than 4500 at the top. The column design would not be appreciably affected. Great example of why we can use a pin.
  9. 271828

    Valid Pin Boundary Condition?

    Consider a simple shear connection between a beam and column. The beam will have an end moment that is ignored for the most part. That moment will be small if the connection is detailed correctly, such as a double angle with non-thick legs. Your base plate is kinda like that. If you don't...
  10. 271828

    Do you guys defer steel connections? Should it be on the contact?

    W8x10 and W10x12 are almost always very short, so little of the cost is from tonnage. The weight difference is small between those and W12x14, which almost never causes any connection difficulty. I used to be an EOR and have worked as a connection designer in recent years. Knowing what I know...
  11. 271828

    Simple yield line question

    Incompetence. That's funny. These calcs are difficult IMO. I appreciate that you cranked through those terms!
  12. 271828

    Simple yield line question

    BARetired, thank you for going through that. It's great to have some interaction with these calcs because I think they're difficult. Please see attached. I have some comments in red. Please let me know if you agree or not. 271828
  13. 271828

    Simple yield line question

    At least I avoided a bunch of algebra and calculus mistakes by using Mathcad. Ha. I did one manual calculation with numerical values and it agreed with my computerized calcs, so I feel pretty good about it. I would be interested in knowing if it matches any textbook solutions. I don't seem to...
  14. 271828

    Simple yield line question

    I neglected critical tasks this afternoon and spent time working out the solution to this situation. The curiosity got the better of me. Attached are my calcs. They have not been checked by anybody else but me, so use at your own risk. Also, if anybody sees an error, please let me know! Looks...
  15. 271828

    Simple yield line question

    It might always be 45 deg but I would need to see a reference that demonstrates that.
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