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  1. Grant M

    New 8-ft deep lift station being installed in existing building

    Unfortunately, it may come close to an existing footing but this facility is so old (early 1900s) and has no record drawings to verify foundation sizes and locations. I think I will plan on including verbiage to the contractor to "provide necessary shoring and bracing of excavation, and...
  2. Grant M

    New 8-ft deep lift station being installed in existing building

    Hi all, As part of a project in an existing manufacturing facility, the wastewater system is being upgraded. As part of this, (3) new 8-ft deep lift stations are being installed within the existing facility. We will be sawcutting and removing the existing concrete slab-on-grade, then excavating...
  3. Grant M

    Sloping Roof with Flat Roof Members

    Thank you all I appreciate the help! I think that concept definitely makes the most sense considering the shape of the building Brad805, thanks for sharing.
  4. Grant M

    Sloping Roof with Flat Roof Members

    Sounds good, based on my dimensions I should be able to just drop the beam connection by one course of CMU (8") to achieve the 1/4" slope we currently have. Those beams connect into a bond beam which acts as part of the building diaphragm to distribute lateral loads into the shear walls, would...
  5. Grant M

    Sloping Roof with Flat Roof Members

    Thank you both for your ideas, we do not unfortunately have an architect working on this project (most of those responsibilities have fallen to me). I will try to work with the plumber to see if he has any input on the drainage direction/collection of storm water. In your experiences, is there...
  6. Grant M

    Sloping Roof with Flat Roof Members

    Hi all, I am working on a project involving a new masonry building with a steel beam and metal deck roof system. My original design called for tapered roof insulation to achieve a 1/4"/ft roof slope to drains (see attachment of roof structure layout). The cost came back incredibly high, and the...
  7. Grant M

    Bolt Through Concrete Wall Connection Design

    Greenalleycat, Unfortunately external struts are not a viable option here. But agreed, I plan on being a bit over-conservative on my plate design for that exact reason to mitigate the risk of leaking.
  8. Grant M

    Bolt Through Concrete Wall Connection Design

    EdStainless, We will be using 304SS.
  9. Grant M

    Bolt Through Concrete Wall Connection Design

    As far as a leak risk yes that was definitely considered, we would have a good amount of sealant around the connection, beneath the baseplate, etc. Similar penetrations have been made through this tank in the past, so the owner and my engineering supervisor are not too concerned with that, however.
  10. Grant M

    Bolt Through Concrete Wall Connection Design

    Hi all, I am currently working on a bracing design for a rectangular, above-ground wastewater tank which is already in place. New stainless steel tubes (acting almost entirely in tension) are being installed to brace the tank walls. Due to the high tension loads (ranging from 40-kips to...
  11. Grant M

    Post Installed Epoxy Anchors Installed on an Angle?

    Yes, sorry for lack of clarification, 10-15 degrees from the vertical. Thank you for the insight, I will reach out to Hilti and see what they suggest.
  12. Grant M

    Post Installed Epoxy Anchors Installed on an Angle?

    Hi everyone, For a project I am working on, there are a few skids which hold compressors and blowers and are located indoors. The anchorage system specified were post-installed epoxy anchors. The contractor is having some issues getting these installed, however, as the top flange on the skids...
  13. Grant M

    Metal Building Foundation over Existing Lagoon

    Hi everyone, A coworker of mine recently ran into an issue on a project where a new metal building with shallow foundation system is to be installed over what used to be a lagoon, but which has since been filled. Recently, it was just discovered that an 8" concrete slab was left 8'-0" below...
  14. Grant M

    AWWA vs AISC Code for Bolted Steel Tank Design

    Hi everyone, A colleague of mine recently submitted calculations provided by a bolted steel tank manufacturer to the DNR for permitting review. The tank design followed AWWA code, but the reviewer commented back, "The digester vessel structural calculations reference AWWA D103 as a basis of...
  15. Grant M

    Concrete Pier Design for Large Shear Force

    Yes, based on my calculations I would need two hairpins to transfer the shear load. I haven't used the tension ties before in a design, would this be similar to providing a grade beam spanning between the frame piers? The issue I am seeing is the facto that the pier is set 8" above the floor...
  16. Grant M

    Concrete Pier Design for Large Shear Force

    Hi all, I am working on a project where I received some column loading from a prefabricated metal building supplier, and I just need to design the building foundation system. Due to the client requesting no interior columns for a 75'-0" clear span, the loading coming in from these columns is...
  17. Grant M

    RC Beam - RC Slab Connection Detail

    Hello all, I am currently designing a large underground cast-in-place stormwater collection structure. The roof of the structure consists of a 27" concrete slab which spans to concrete walls on two sides and to two concrete beams (which connect to the walls on each end) on the other sides...
  18. Grant M

    Concrete Support Wall Frequency Calculation

    I failed to mention in my original post that these supports are to be located on the 2nd floor of a large, existing building. So I am wondering if I would have to determine the frequency of the supporting slab/beams/columns or possibly even of the entire building? Thanks
  19. Grant M

    Concrete Support Wall Frequency Calculation

    Okay, thanks for the help!
  20. Grant M

    Concrete Support Wall Frequency Calculation

    Hello, I need to design three reinforced concrete supports (9" thickness, 6'10" length, 2'6" height) to hold up a centrifuge, the supports are spaced 50" and 140" apart. The resonance frequency of the centrifuge is in the 3-8 Hz range and I need the substructure to have a rating in which the...

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