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  1. BR0

    Stairway forces on Shell

    HTurkak, Awesome. I will look into those resources.
  2. BR0

    Stairway forces on Shell

    JStephen, Thanks for the response, and I guess I figured most of what you said is occurring as I do the same in my calculations. Interesting thing about delegated designs is that they typically are for the portions of work that may not be the EOR's own specialty. I usually only review the...
  3. BR0

    Stairway forces on Shell

    Hi All, I think this may be an easy answer for a tank designer. I found a few other threads with similar questions, but didn't see an answer. On water tank projects, our company would typically provide the civil engineering and the foundation design. However, the tank design is a...
  4. BR0

    Water tank Manhole Design Example

    JStephen, That sounds like a good suggestion to put another one in a separate location. I think they do want an in-swing manhole, though. Do you know any document that provides a design example and also typical detailing. Maybe one of PIP documents? Even defining the different terms that...
  5. BR0

    Water tank Manhole Design Example

    Hturkak, Thanks for the response. I'm evaluating an 80-foot diameter x 15-foot tall welded steel water tank. The shell plate is 1/4" thick. Our primary scope was a roof, wind/seismic, and foundation analysis and evaluation. We do this scope a lot, including the construction documents for...
  6. BR0

    Water tank Manhole Design Example

    Hi All, I was wondering if anyone knows of a suitable textbook or other industry source with examples of water tank designs for some of the ancillary items. Currently, I'm trying to find examples of manhole and vent sizing design in new or existing water tanks. I have pretty good examples of...
  7. BR0

    ACI 318-19 Section 17.10 - Anchor Bolt Design for Seismic Site Class C

    You probably know this, but Hilti, Simpson, and Dewalt all have free software that can do a lot of the calculations. I live in a seismic design category D or greater, so I can't assist you with an example. To be honest, the calculations are so onerous that I gave up about 10 years ago, trying...
  8. BR0

    ACI 318 Chapter 17.10.6 EQ Resistant Shear design

    I have never had any luck trying to use the provisions in ACI 318 Chapter 17.10.6.3 to limit the design force to less than the over-strength (omega) times the applied force. I was wondering if others have the same experience or am I missing something? In (a), you can limit the force to what a...
  9. BR0

    Wood Floor/Roof Joist cross-bridging

    I thought the repetitive member increase was due to load sharing.
  10. BR0

    Wood Stress Wave NDT question

    It is pretty nifty. We have used the consultant who has the equipment before for a similar type of evaluation, but never with a reduced material capacity given. It was usually to identify internal degradation that wasn't visible or identifiable from the outside. We used it to determine if the...
  11. BR0

    Wood Stress Wave NDT question

    Hi All, I am working on an existing building with about (100) 5.25x15 - 24F-V4 glulams. Many have deteriorated in one area due to a waterproofing issue. Many of the glulams have damage that is a bit of a grey area that visually and by sounding is not severe but there does seem to be some...
  12. BR0

    Deck Seismic Analysis

    I have struggled with this quite a bit, but here are my 2 cents. I do think you have to check both directions, but perhaps you know the controlling direction is transverse. 1. I have tried using the timber frame cantilever system concept, but have never been able to make it work for any...
  13. BR0

    Cross-grain bending when using rafter/joist hangers

    I think between the studs I would consider it torsion and not cross-grained bending. However wood doesn't handle torsion very well so it might be considered equally bad.
  14. BR0

    Coil rod or threaded rod

    I worked at a precast company 25 years ago doing design, so this probably is outdated info. However, we used coil rods a lot for final connections. The thread issue with concrete clogging up the embeds in typical threaded rods is real. Having said that, coil rod didn't (at that time) have the...
  15. BR0

    Cross-grain bending when using rafter/joist hangers

    It seems like you don't have your boundary conditions drawn in for your ledger. You would have cross grain bending like you drew if the ledger was supported at the bottom only. A lot of ledgers to studs would have several connectors along its height that would resolve the tension force and...
  16. BR0

    Seal on calcs but not on plans

    The OP's question is one that I see a lot with deferred delegated designs. On deferred submittals, quite often they consist of unsealed shop drawings and stamped calculations. I have reached out to the local building department to see how they handle this and what codes or other regulation...
  17. BR0

    Proposals and Exclusions

    Thanks for the responses. I do agree that delegated designs can be messy. The main reason to exclude them from a proposal is how undefined they are at the time you have to give your proposal. I find a lot of times that stairways and guardrails become significantly more custom as the project...
  18. BR0

    Proposals and Exclusions

    We probably need to add exclusions as you do. We have had a general rule to state what we include, but not what we exclude. The idea was that once you state exclusions then everything else is included. I imagine it is a statement that excludes items but is not limited to only those items.
  19. BR0

    Proposals and Exclusions

    Sorry in advance for the long-winded question. I do mostly structural design and this particular question is primarily to do with buildings. Sometimes these are elements detailed on other consultants' drawings with a note stating "See Structural Drawings". Some of them are items that may be...
  20. BR0

    AWWA D-100 and Vertical Acceleration

    Thanks for the responses. That commentary is interesting and helpful. Here is the section from AWWA 2021 for vertical acceleration. The commentary in this document doesn't mention anything similar to what API 650 states. 13.5.4.3 Vertical design acceleration. The design of the tank and...

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