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Recent content by Ricyteach

  1. Ricyteach

    ASCE 7 wind load for round irrigation tank

    Yup makes sense. So I would not multiply the category II by 0.78, I would multiply whatever the applicable category speed is, I, II, III, or IV, by 0.78. That makes more sense than just the II to get the 50 yr.
  2. Ricyteach

    ASCE 7 wind load for round irrigation tank

    Great this helps me understand that I'm in the right ballpark. For t I've calculated an equivalent thickness, t, based on the moment of inertia, I, since the buckling resistance is a function of the moment of inertia in the circumferential direction. t = (12 I)^(1/3) Btw I'm pretty sure the 3...
  3. Ricyteach

    ASCE 7 wind load for round irrigation tank

    Anyone care to check my math on this? As a placeholder I'm assuming a corrugated section for the tank walls with moment of inertia of 0.0024 in^4/in. This is equivalent to a wall thickness of 0.307 in. The unreinforced height equation (H1) per API 650 5.9.7.1 is: H1 = 6000000 t (t/D)^(3/2)...
  4. Ricyteach

    ASCE 7 wind load for round irrigation tank

    Thanks. No way that 16 psf minimum pressure controls; this is Indian River County in Florida. I believe the product designer is taking some responsibility for the structural design and I'm only looking at foundation design, drag, OTM, and giving them the applied loads (they're in Europe so the...
  5. Ricyteach

    ASCE 7 wind load for round irrigation tank

    Hi if anyone would be willing to help me with what I think it a simple question I would appreciate it. What I have is a group of 8 irrigation tanks, about 45 ft diameter and 18 ft tall, spaced at about 60 ft (so greater than 1.25 D but less than 2.0 D, so they are partway between isolated and...
  6. Ricyteach

    NDS Supplement design values: nominal or actual dimensions?

    Thanks for confirming! Annoying this doesn't seem to actually be stated outright in the supplement that I could find.
  7. Ricyteach

    NDS Supplement design values: nominal or actual dimensions?

    This is probably a dumb question but I don't often need to use the NDS so: today I was looking at the supplement for design values for a 2x6. All the tables reference 2" to 4" thickness, etc etc. I do not see anywhere in the NDS or the NDS supplement where it states that these dimensions are...
  8. Ricyteach

    Select an Area Inside or Bounded by a Closed Frame

    I want to quickly select area or shell elements that are inside the enclosed area of a frame. To explain better: see image below. There's a frame (blue), a metal headwall (orange/yellow), and a skewed (corrugated) pipe arch (red). I want to "cut" a hole for the pipe opening in the mesh of the...
  9. Ricyteach

    Could there be a beam continuously underlying/supporting a "bearing wall" in timber construction

    Great suggestions thanks all. Yes I immediately recognized the 16x increase in deflection! I was able to get the span down to 15 ft (by suggesting we support on steel columns about 6 in from each wall) for a 25% reduction. So that helps. Will anchor the tops of the steel columns to the existing...
  10. Ricyteach

    Could there be a beam continuously underlying/supporting a "bearing wall" in timber construction

    Yup, using deflection criteria for this beam based on modern day load assumptions! 50 psf combined floor load, 20 psf for the plaster walls. Does L/480 make sense for the 16 ft span in a home like this? Should it be ramped up much higher to L/720 or something? Building code says L/360 but I...
  11. Ricyteach

    Could there be a beam continuously underlying/supporting a "bearing wall" in timber construction

    Nope, no indication of columns lining up with the brick piers. It's a good point about it being unlikely to have been built this way strictly for economic reasons! Also walls acting like deep beams seems to be a big part of the answer to my riddle since the plaster and lathe probably wants to...
  12. Ricyteach

    Could there be a beam continuously underlying/supporting a "bearing wall" in timber construction

    SUMMARY: What I am imagining is- instead of a bearing wall just sitting on joists which then sit on another bearing wall below- perhaps there a style of construction where a wall sits on top of joists, and those joists then sit on top of a beam that supports the weight of that wall plus the...
  13. Ricyteach

    How to turn on display of points/nodes in SAP2000

    AHHHHHH boy do I feel dumb. Thanks! I feel like SAP organizes things in its menus and dialog boxes in a somewhat confusing way. There's been several things like this that I have tried to track down and all the time it was staring me in the face.
  14. Ricyteach

    How to turn on display of points/nodes in SAP2000

    Pretty simply question, but I have looked everywhere can can't find the answer: In SAP, how do I turn on/view the blue nodes in my view window? I know it's possible because they have been turned on in another file (accidentally) but I have no idea how I did it. I did not draw these nodes, they...
  15. Ricyteach

    Reduce the unbraced length for checking LTB of W column using warping resistance?

    @cantwest: yes there is fly bracing from the tilt beam to the purlins as you suggested. The top and bottom of the column are both fully welded to the cap plate and base plate, and both these connections also have a vertical stiffener plate on both flanges of the column. The tilt beam also has a...
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