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  1. HZStruct

    Hollow Core Concrete Beam Analysis

    Thanks for the response. I agree with this approach. After some more research, I am going to check the depth of compression block is above the void. If it is, I would do a typical beam analysis. If the compression block is within the void, I would do a T-beam analysis. Checking the shear based...
  2. HZStruct

    Hollow Core Concrete Beam Analysis

    Yes, in a region with seismic, but unsure why that affects the analysis of a beam with a void. To clarify, the beam would be the encasement and is not a Hollow core plank. The beam would span between supports.
  3. HZStruct

    Hollow Core Concrete Beam Analysis

    Hello, I am looking to analyze a rectangular beam with circular void in the middle as a structural member, similar to a ductbank or a pipe encasement. Are there any good design resources that go over analysis of hollow core concrete beam members? Any recommended approaches for analyzing a hollow...
  4. HZStruct

    Subgrade Modulus for Mat foundations

    Hello all, I'm analyzing a mat foundation in STAAD and would like to get input on the subgrade modulus being used. I'm using plate mat foundation supports in the Y-direction in STAAD. The geotech report stated a unit subgrade modulus of 150 pci and suggested that the subgrade modulus be...
  5. HZStruct

    Modeling Offsets

    Hello, I am modeling an existing, large storage structure with precast concrete columns, steel girders, steel purlins, and metal decking. I'm focused on modeling the steel framing members to determine member forces. The girders are fastened to the top of the precast concrete columns and the...
  6. HZStruct

    Water Storage Tank by Region

    Thanks for the insight and photo, JedClampett!
  7. HZStruct

    Water Storage Tank by Region

    Hi JedClampett. I saw an old post of yours from 2013 on tanks, so good to see you are still active. AWWA D110 is Wire & Strand Wound, Circular, Prestressed Concrete Water Tanks. I found a few large concrete tank manufacturers (DN Tanks, Crom, Preload), but steel tank manufacturers seem to be...
  8. HZStruct

    Water Storage Tank by Region

    Hello, I am working on a water storage tank project in the intermountain region of the US (WY, CO, UT, etc.) and I am looking into the different types of tanks. I have little experience with water storage tanks and the ones I am familiar with are AWWA D110 Type I for high seismic regions. Are...
  9. HZStruct

    Basic Foundation Overturning Question

    Does the "De-stabilizing load" account for the de-stabilizing load of the slab and the structure it is supporting or just the structure above the slab? I have attached a simplified diagram for reference...
  10. HZStruct

    Basic Foundation Overturning Question

    Hello, I am checking the overturning stability of a slab-on-grade supporting a pipe support. I am checking the overturning about the bottom edge of the slab, which is 14" below finished grade. My resisting force is the sum of the vertical load (weight of pipe and concrete slab). My question is...

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