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  • Users: AThor
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  1. AThor

    Rebar Development Wall to Diaphragm Connection

    Okay, I have been puzzling over this all day, and after pouring through ACI 318, Hilti, and other Eng-Tips threads, I finally decided to just ask. I am replacing an existing concrete roof slab in a simple building with 6" concrete walls and roof. The attached detail shows the planned replacement...
  2. AThor

    Concrete Border On Grade Next To Trench Wall

    I was hoping to get some thoughts on the following situation. We are designing some work inside concrete walled trenches, and there are some concrete lids being replaced. In the process of replacing the lids, the contractor has to demo the surrounding asphalt surface back a few feet, and...
  3. AThor

    Structural Theory Question Regarding Fixed/Pinned Ends

    Hello, I would like to get some responses about a theoretical question I have been wrestling with on numerous occasions. I think understanding the underlying concepts better would help clarify a lot of things in my head. I've attached an illustration of two recent problems that relate. Case 1 is...
  4. AThor

    Pipe Hanger Seismic Analysis - Moment in Rods?

    I am trying to understand and analyze a detail for a hanger support with seismic brace for a run of multiple pipes. The pipes are sitting on beams that are held up by threaded rods, coupled to anchors embedded in the concrete above. So far in my career I have not managed to fully wrap my head...
  5. AThor

    Tank Anchorage, Overstrength Factor, and Overturning

    My question relates to ASCE 7 Chapter 15, particularly 15.7.5. I am designing the anchorage for a saddle supported liquid storage tank. Section 15.7.5 makes it clear that the overstrength factor is NOT to be used for tank anchorage calculations, because they are trying to force a ductile yield...
  6. AThor

    Friction Contribution to Lateral Force Resistance

    Hello all. I have a somewhat theoretical question relating to calculating the required tie down force for resisting lateral forces, particularly seismic. I have attached a sketch to illustrate the scenario I'm thinking of. Let's say I have a rigid box type structure, say 10'x10'x10'. It rests...
  7. AThor

    Seismic Design of Small Mezzanine

    I just wanted to get some feedback on several aspects of a project I have been working on. I am designing a small (40'x25', 4' tall) mezzanine. It will be used for storage, so design LL is 250 psf, for heavy warehouse storage. The design is a composite deck, W beams, HSS columns, 12 bays. The...
  8. AThor

    Shear Reinforcing for Replacement of Sluice Gate

    Just a quick introduction, I have found this forum very helpful and interesting since starting my first engineering job this past year, so I decided to register, and this is my first post here. Anyways... I am looking at a project involving replacing a sluice gate embedded in a concrete wall...

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