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  1. phamENG

    Digital Seal and Signature

    My first encounter with these requirements were on US Federal Government jobs. The Navy required a certain signature key or something and all of the sealing professionals had to meet at the architect's office on a set day to electronically sign their sheets of the set, because once signed they...
  2. phamENG

    Vibration of WF Beam Girders Supporting Steel Joists for Banquet Hall

    No. Not in the least. I was pretty terrified. Everyone else was having a great time (and also probably drunk). Everyone was dancing in unison and I could barely walk across the floor. I got to side of the room where the joists were bearing and walked along it to the door and got out of there.
  3. phamENG

    Digital Seal and Signature

    It embeds it into the PDF. When you put a stamp on a PDF in Bluebeam (or Adobe, I imagine), it's a markup, which are stored differently. The contain attributes such as who placed it and when, and the ability to copy, move, or delete it. If you flatten it, it removes the markup status and it...
  4. phamENG

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    While this math is technically correct, it doesn't really mean anything. For the loads to increase 5%, we need to compare them to what they were before. You're combining the increase in individual loads, not comparing the increase in loading based on the load combination. You go on in your...
  5. phamENG

    Vibration of WF Beam Girders Supporting Steel Joists for Banquet Hall

    Went out to a club at the University of Virginia during an ASCE conference/competition while I was in school. Wasn't exactly a rave, but it was a second floor room with wood joists from the mid 1800s spanning a good 20 feet. That floor was moving up and down at least 6 inches.
  6. phamENG

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    ...are your original dead and snow loads. Say the dead load was 100plf, and the snow load was 50plf. Originally, you had 150plf. Now, you have 1.05*100plf+1.05*50plf=157.5plf. 157.5plf/150plf = 1.05. The total load went up by 5%. Not 10%. Mike isn't writing the load combination, he's...
  7. phamENG

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

    Once had an architect ask me, after I explained everything on the job my boss had directed me to delegate, "so why did I hire you again?"
  8. phamENG

    IEBC Allowable 5% Gravity Increase on Total Load or Load Type?

    If you know the capacity, and the new demand is under that capacity, then you're good. The 5% (whatever that 5% actually refers to - clearly it's, well....unclear) is a threshold for doing anything to it. If you don't exceed it, then you're good. If you do exceed it, then you need to go...
  9. phamENG

    strain in plastic hinge

    So not unlike blast protection design. In that case, I would design it like any other steel structure - don't anticipate a collapse mechanism, even if only momentary, and design it to resist the load in the plastic or elasto-plastic region - but then proportion it such that if it fails, it will...
  10. phamENG

    strain in plastic hinge

    If you have a plastic hinge in the middle of a simply supported beam, you have a collapse mechanism. By the simplified models we use for design of structures, this implies infinite strain. Realistically, you're into some very non-linear stress/strain behavior that is likely not going to be...
  11. phamENG

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

    Sounds like you need to read the code of standard practice! But don't worry, most engineers don't know they should read it, either. It lays out all the options for handling connections.
  12. phamENG

    Deflection on multi-story commercial building

    Depends on what it is, but usually it's just down. At the roof you may get some upward deflection due to wind uplift, but it's usually very small, especially in heavier commercial buildings where the roof is concrete and the dead load negates much if not all of that uplift. There are other...
  13. phamENG

    Learning Structural Connection Types – Pin vs Fixed (Real World Example)

    Your understanding of the concepts is generally correct. The best thing to do in these cases is to draw a free body diagram of your frame. What loads do you have acting in the X and Y directions (and Z if you want to get fancy). What reactions do you have in each of those directions? Now...
  14. phamENG

    Adding a shed roof to the backyard

    To add to my last comment - this probably doesn't matter in Colorado, but for posterity's sake if somebody from the south/south east is reading this - make sure you consider variations in reference design values. For instance, if I'm checking to see the minimum size for an existing header of a...
  15. phamENG

    Adding a shed roof to the backyard

    If there's no way around it - beefy ledger, beam above, etc. - then at the very least I'll list the minimum required header size and put the onus on the contractor to verify the size during construction. Most homeowners don't want to rip open a wall like that - it's often months before...
  16. phamENG

    Attachment to Existing Terra Cotta

    WHAT!?!?!? There's an entire sector of the industry devoted to restoring buildings made of these materials. I realize it's not a huge part of their business, but it was an under served market even when they were serving it.
  17. phamENG

    Attachment to Existing Terra Cotta

    Sort of. The latest guide says to refer to the 2022 version for brick. And that, from what I can tell, can be found here: North American Product Technical Guide: Version 22
  18. phamENG

    A Conceptual Modification to the Continuing Education Requirements

    Never saw one that big. The true floppies were going out right as I started learning to use a computer. My grandfather had one, but he wouldn't let us touch it until we'd had a class in school (7th grade, I think?). I learned on computers that had the 3.5" hard disks, and then CDs changed the...
  19. phamENG

    A Conceptual Modification to the Continuing Education Requirements

    Was the 3-1/2 really floppy, though?
  20. phamENG

    Valid Pin Boundary Condition?

    Maybe? Depends on the moment. And what deformation is expected at ultimate load and whether or not the connection will survive that deformation. Only true pin is, well, a pin. Not sure what you mean by where the moment goes?

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