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  1. Seppe

    Hips, valleys and load points

    Agreed that just about any complex roof can be solved with prefabricated trusses provided the ceiling plane is flat. But I think it’s implicit in the OP that flat ceilings are not the case here, hence the questions about concentrated loads and concern over their magnitude. If I’m an architect...
  2. Seppe

    Hips, valleys and load points

    A valley member will have vertical reactions that need to be resolved, and these reactions can be quite large. It’s just a function of the geometry of the roof and the load being collected at these points. A hip, on the other hand, does not need discrete vertical supports as long as it is...
  3. Seppe

    Specifying Steel Fibers in Slab

    So if a SOG doesn’t perform properly, say in the form of joint displacement or excessive cracking that ends up being detrimental to the operations / function of the building space, who is responsible for that? The fiber manufacturer? The architect? Do they know that they are expected to take...
  4. Seppe

    Specifying Steel Fibers in Slab

    Really good question that I’d like to expand upon. Is it really feasible to delegate the design of the entire slab to a third party? I can see it more clearly with discrete components like prefabricated wood trusses or cold-formed steel “infill” framing, but it’s not as obvious to me how the...
  5. Seppe

    Trying to explain to non-engineers that it may be OVERKILL, but it is NECESSARY

    The code requires us to design for a multitude of different scenarios comprised of simultaneous loadings and load effects. The likelihood that some of these scenarios ever actually occur is immeasurably small. Perception be damned, as structural engineers this is the standard of care we are...
  6. Seppe

    WWF Smooth Vs Deformed

    We use structural mesh quite a bit, actually. Mostly with the tilt-up walls and industrial slabs we design, but we also allow it in foundations and elevated slabs. It’s more for the contractor than anything else given it can help speed up their placement operation. Simplest approach for us...
  7. Seppe

    WWF Smooth Vs Deformed

    The author of the article appears to be incorrect here. ACI 318 does recognize bond between concrete and welded plain wire reinforcement, achieved via bearing and shear strength that develops at the welded crosswire intersections given that the smooth surfaces of the wires needing to be...
  8. Seppe

    Inverted T-beam (Reinforced Concrete) Analysis and Design

    Why not just run it by hand and simply represent it in the software as a dummy member?
  9. Seppe

    i am enquiring if this wall looks l

    Hire a structural engineer.
  10. Seppe

    How does concrete bind when it is dried and harden ?

    Did you try typing in "how does concrete harden" as a Google search or perhaps checking out something like YouTube? I would recommend exhausting the rudimentary resources that are available to you and putting in a bit of your own research time. You'll be better (and more knowledgeable) for it.
  11. Seppe

    Rebar Mat Use/Availability

    I do think there is some merit to using WWR for the purpose of easing "in house" detailing as you've noted. From what I've experienced, the detailing still gets done, but it's handled by the fabricator's WWR detailer in the form of a submittal that the engineer would review for design...
  12. Seppe

    Rebar Mat Use/Availability

    WWR mats are commonly produced using 80 ksi material, and using wire sizes up to and including a D31.0 (deformed wire with steel area = 0.310 in2). I know of several wire producers who appear to operate comfortably in both cast-in-place and precast concrete markets where the larger diameter...
  13. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 13

    Conspiracy. Corruption. Potayto. Potahto. I'm simply saying that, with regards to some of the discourse on this thread, the sensationalism is shape-shifting. Originally it was talk of rolls of tar paper on the roof being the smoking gun for pool deck collapse. And now that folks seem to...
  14. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 13

    Were sites at the collapse of structures like the WTC, Murrah Building, Minnesota I-35 bridge, and FIU bridge open to numerous investigative entities? I feel like these events and others like them have always been the "tip of the spear" jurisdiction of agencies like NIST and NTSB, with...
  15. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 12

    Myself and others have postulated this same general theory, and have presented it across several posts that can be found in the first few threads of this topic: -questionable design and execution of a highly-sensitive structural system (two-way flat slab susceptible to a punching shear...
  16. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 10

    So you are 100% certain that there hasn't been selective access allowed for certain relevant parties on a need-driven basis? What would be the justification/precedent for some random entity with a drone to be given permission to tool around above the site (which presumably is still privately...
  17. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 10

    Honestly... at this point I'm just here for the MarkBob2 (et al) posts. My own sanity and the memory of William of Ockham be damned, I'm all in! It's like Tobias Fünke himself is now dabbling in forensic engineering, and I think we can all agree that's awesome.
  18. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 09

    LionelHutz and Ingenuity's posts directly above are a good summation of my thoughts. I've been practicing structural engineering for my entire career, and I've visited this website for at least the past ten years (only lurking, at first). The structural engineering community on Eng-Tips, from...
  19. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 09

    Like Spartan5, I'd like to see some quantitative basis from the "roof-first" crowd. How do we go from a rebar potentially nicked by a hammer-drill to Marvel Universe level destruction, and how do you get the timeline to actually make sense? Was it because, as one poster suggested, the crew was...
  20. Seppe

    Miami Beach, Champlain Towers South apartment building collapse, Part 09

    Or perhaps not every poster here is as compelled as you and a couple others seem to be when it comes to throwing every strand of woulda-coulda spaghetti against the wall to see what might stick. This isn't a competition to see who is willing to dig into the bowels of minutiae just for the sake...

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