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  1. bookowski

    Cast Stone Top Anchor Freeze/Thaw

    @ane - Let me clarify. This particular condition happened at a stone corbel. The diagram below "1" is not the same but gives you the idea. In my case there is no steel beam, it is all brick masonry backup. The top anchors shown here provide the same concept, it's a pocket carved out on top for...
  2. bookowski

    Cast Stone Top Anchor Freeze/Thaw

    This is for unreinforced history stone & mass masonry walls. I am looking at a building where a stone failed by splitting. There have been two engineering investigations/reports and they differ in their opinion as to the cause. I've been asked to review both. Leaving aside their opinions here...
  3. bookowski

    Seismic drift - moment of inertia to use for shear walls?

    Not related to your question, but be cautious putting a wall in front of the elevator as you show. They'll want it left open at the base for cab install (or a leave out that you have to pour later, yuck). In your sdc wind drift should control in Y.
  4. bookowski

    Steel Truss Diaphragm High Seismic | Requirements/Tension Only

    @cpb - Good find on that presentation. Are you referring to the page with the label pg 22 or the 22nd page of the pdf? The pg labeled 22 is a slide that says "Members and their connections shall be designed for load combinations with overstrength, Ω". The 22nd page of the pdf is a brb example...
  5. bookowski

    Steel Truss Diaphragm High Seismic | Requirements/Tension Only

    @cpb213 - can you clarify what you mean by "it became clear that we can't use the ASCE 7 overstrength factor". I re-read the commentary, I don't see how you're getting that. It reads that you should use the overstrength factor, but allows exceptions where you can not use (and instead design the...
  6. bookowski

    Steel Truss Diaphragm High Seismic | Requirements/Tension Only

    Yes, that but more generally speaking any of the concerns with using a tension only brace in the main lfrs. I was hoping the code would be more clear, so I could either yay or nay it. But it isn't clear. The response from the solutions center said that it's basically up to me and that it does...
  7. bookowski

    Steel Truss Diaphragm High Seismic | Requirements/Tension Only

    Without going into too many details, I am trying to figure out the requirements for using a steel truss diaphragm in high seismic regions. In particular, I am looking at examples from substantial buildings that were done with flat strap structural steel X bracing, visually I'd estimate the...
  8. bookowski

    Roof Topping Slab in High Wind

    I punted on this. I've said that we are reviewing for the loads imposed of this alternate system only and that the approval of the roof itself, and the detailing, is per the architect. It seems that all are in agreement that the wind pressures are somewhere between zero and very small, but...
  9. bookowski

    Two Way Shear - vs in Thick Elements

    Maybe that's what I was remembering, the 8 to 6 reduction. I never heard of stacking studs.
  10. bookowski

    Two Way Shear - vs in Thick Elements

    Note that there's a recommended extra reduction in capacity when using rebar instead of studrails. It's not in 318 so you don't have to follow it but for the cost of a few extra bars its worth considering for heavy situations. It's probably in 421 and I think it's another .75 factor (been a...
  11. bookowski

    Roof Topping Slab in High Wind

    @EZB - I recommended the LWIC as my first response, they want to use standard concrete. I don't have experience with LWIC but I had looked into it and it seems that it gets its its resistance through bonding to the slab as you said. I am ok with this system, but this is what they're trying to...
  12. bookowski

    Roof Topping Slab in High Wind

    I've got some concrete projects in a high wind area (~170mph and exp D). The roofs were supposed to be monolithically pitched to drains. The contractor built them flat and wants to pour a topping slab to achieve the slope. Unless I'm missing something this does not appear to work w/out a silly...
  13. bookowski

    Pay cut to go back to consulting?

    Both seem reasonable. Taking a pay cut isn't crazy, presumably you're unhappy for a variety of reasons since you're asking randos on the internet what to do. I'd take that as a sign that you want to move on. Your general happiness and satisfaction can be considered part of your compensation. But...
  14. bookowski

    Structural Slab Supported at Corners

    It is not related to the safe rigid zones around columns or strips, it is about a point restraint OoP on an FE element and how safe internally accounts for this. It is an issue so you need to do a workaround as described in my previous post.
  15. bookowski

    Structural Slab Supported at Corners

    SAFE does not like a point pin support and it is internally accounting for it with a constraint. This is one of the features of csi products that is intended to be helpful, and probably often is, but can hide incorrect modeling/behavior at times. Put a column at each corner that is tiny, say...
  16. bookowski

    Seismic Retrofit Argument

    I'm definitely not in favor of yearly assessments for buildings. If this is multiple choice and I have to pick one of your options then I'd choose the until it falls down one. Interesting that you chose the yearly auto inspection because that's one of my pet peeves. I've got a weird quirk where...
  17. bookowski

    Seismic Retrofit Argument

    I've got a good sample here and that was my goal, getting feedback on how the gen pop would view this. Thanks for the responses. No one is changing any minds at this point, but to respond to this one - you seem to be implying that an additional story will cause a failure and comparing the...
  18. bookowski

    Seismic Retrofit Argument

    @Greenalleycat - You seem blinded by seismic rage. I'm not suggesting that adding a 4th floor doesn't increase the risk relative to its current state. I also don't think that there's any lack of appreciation for seismic behavior, but it doesn't trump all other considerations. Why let them use...
  19. bookowski

    Seismic Retrofit Argument

    The curve has shifted over quite a bit towards the negative region. 100%, there is zero chance that it meets any modern detailing requirements. To be clear, I am not trying to get away with something. I'm not posting on a public forum about a plan to try and sneak something past the...
  20. bookowski

    Seismic Retrofit Argument

    Nice spread on responses. If I take 0 as neutral, + as do it, - as don't do it: koot (+2), struct (+1), tlhs & jae (2 x -1), green (-2). @Kootk: I'm roughly where you're at right now. One thing that concerns me wrt to the likely detailing is that in my experience with old concrete buildings...

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