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  • Users: SKIAK
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  1. SKIAK

    Slab Schedule "Bottom Bars Bend Up"

    Interesting, thanks hokie66. Found this link: https://constructionqueries.wordpress.com/2014/11/17/bending-backwards-for-bent-up-bars/ Without details, I don't think I would count on it, but that leads me to believe that there may have been some fixity expected at the ends and the slab may be...
  2. SKIAK

    Slab Schedule "Bottom Bars Bend Up"

    I am evaluating a concrete floor in a building constructed around 1952. A snip of the slab schedule is attached. It indicates "Bottom Bars" at say #4@10" then the next column says "Bend Up" and what looks like 1/2? Does anybody know what that means? There are no sections that show the...
  3. SKIAK

    Have you ever seen this joist?

    One of the concerns to be aware of when trying to analyze joists is the length of the weld provided at panel points and other locations, and it is not adequate to only measure one weld or assume a full length weld. Field verification of each weld would be required to ensure capacity, as I was...
  4. SKIAK

    Existing Concrete Deck - Welding Washers

    Can anybody tell me what this welding washer is on the attached image, and what is it supposed to do? I'm guessing it is supposed to facilitate shear transfer between the concrete and the...
  5. SKIAK

    Direct spectra-to-spectra response

    What is a direct spectra-to-spectra method? I am working on an equipment platform on a Risk Category V structure, and am working on developing an in-structure response spectra, however the UFC states "In the application of ASCE 4-98 Section 3.4, those provisions that relate to...
  6. SKIAK

    ASCE-31 - Force/Deformation Controlled Actions

    I am performing a Tier 2 evaluation of an existing structure and I have a question about determining whether a component is force controlled or deformation controlled. I feel like I am just getting too bogged down in the interpretation of the text. Am I to assign whether a component is force...
  7. SKIAK

    Seismic approved, or not seismic approved?

    This is true, dhengr. I don't know the material strength, or the capability of the previous clips to bite into the strut and provide the same lateral resistance. Considering these electrical cables were the main service for the entire building, I felt more comfortable going with the tested...
  8. SKIAK

    Seismic approved, or not seismic approved?

    I agree JStephen. It seems that there is one fabricator for these clips, and they get passed to different companies to be stamped and distributed. If that were true, I would think they would have the same capacity but one company paid for testing the other did not. Of course, that is an...
  9. SKIAK

    Seismic approved, or not seismic approved?

    Yes. The new straps that replaced the old straps are manufactured by B-Line (or Cooper Industries, or EATON, or whoever they are now-a-days) and have tabulated design loads. I am confident that the new straps have adequate capacity for the application.
  10. SKIAK

    Seismic approved, or not seismic approved?

    I was tasked to provide details for seismic bracing for some electrical conduit runs. The situation I walked into was the new conduit had already been installed and was supported by trapeze hangars from the concrete slab above. I asked for information about the existing supports: size and span...
  11. SKIAK

    Using a Previous Design

    Yeah, that's the one thing I can't be sure of. I haven't yet looked into finding information about the wind speeds experienced over the last 20 years compared to design speeds. It could certainly be possible to experience a higher wind speed in the next 20 years and exceed the loading...
  12. SKIAK

    Using a Previous Design

    I considered the repair option but I get back to the same situation because the rebar would likely have to be “repaired” (replaced) since a lot of it is rusting out. Again I am in the situation where I am putting that detail on my drawings and signing off on them. Is that any different? I...
  13. SKIAK

    Using a Previous Design

    Is it foolish to copy a design that appears to have worked satisfactorily for 20 years? Or is it foolish to create a new design that costs roughly 10x more to “ensure” it works? (just playing devil’s advocate) Again, this is a fence out in the middle of nowhere… literally. I wouldn’t...
  14. SKIAK

    Using a Previous Design

    I have seen several of the manuals produced by the Permafrost Technology Foundation and they are usually very good. I have quite a bit of experience designing in permafrost conditions. To get your PE in Alaska you have to pass a class in Arctic Engineering which coveres all these topics...
  15. SKIAK

    Using a Previous Design

    I considered the option of detailing repairs for all the individual types of failures, I even wrote up a narrative explaining all of the details; I decided against that for a few reasons. The shipping costs go up even more if you consider shipping out materials in several smaller packages. The...
  16. SKIAK

    Using a Previous Design

    Yup Greg, that's pretty much it. The uplift at the base of the fence from the wind is easy to calculate. There is also uplift that is created from the active layer freezing (the frost jacking forces). The basic force balance is uplift from the wind plus uplift from the frost jacking has to be...
  17. SKIAK

    Using a Previous Design

    Yes, adding weight would work. The problem with adding weight is the shipping cost. The materials are getting barged out to the job site and the shipping cost is based on weight and volume. The shipping cost estimate for just the fence materials is already hovering around $100,000 which makes...
  18. SKIAK

    Using a Previous Design

    So I guess that attachment didn't post, I'll try again.http://files.engineering.com/getfile.aspx?folder=3bcdb29b-5191-4f01-a7ae-3fe09a7e1026&file=SnowFence.JPG
  19. SKIAK

    Using a Previous Design

    The top layer of soil in permafrost is called the active layer, it will freeze in the winter and thaw in the summer.
  20. SKIAK

    Using a Previous Design

    Okay, well, maybe I should have just done this sooner but here is a quick sketch of the fence. The fence supports are made up of 2x6's built into a triangle shape. I have data to obtain wind speeds and wind pressures. I can do the wood design. With statics it is very easy to resolve the...

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