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  1. 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.
  2. 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...
  3. 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?"
  4. 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...
  5. 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...
  6. 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...
  7. 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.
  8. 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...
  9. 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...
  10. 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...
  11. 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...
  12. 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.
  13. 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
  14. 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...
  15. phamENG

    A Conceptual Modification to the Continuing Education Requirements

    Was the 3-1/2 really floppy, though?
  16. 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?
  17. phamENG

    Thin stair concrete design

    No, there's no metal pan under any of that. I doubt there were any additives. I think this one just got lucky. Maybe the plant where they were made (I find it hard to believe it's anything but precast) used an especially good mix, or really low water so it's really strong, or something...
  18. phamENG

    How do you brace home on addition project following the IRC?

    Generally, your options are to look at the entire house and do braced wall calculations for the whole thing, or design the addition to be structurally independent. The first option is usually pretty tough, unless the house is new(ish), followed braced wall rules more or less comparable to...
  19. phamENG

    Rafter and wall plate connection

    Why are we trying to reinvent the wheel here? This is an incredibly basic and well documented type of construction. Just build it like a normal light frame wood garage. No need for funny little rotating blocks. Just tie the rafters and be done. Or put in a ridge beam if there's something...
  20. phamENG

    Understanding Concrete Framing Slope Annotation

    Looks like an error in the drawings. Only way to know for sure is to go out and measure.

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