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  • Users: Engingguy
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  1. Engingguy

    Water plant filter, estimate of annual maintenance costs

    Hello, I am doing an alternatives analysis of replacing a municipal water plant filter and clarifier vs. replacing a filter and repairing an existing clarifier. What would be a reasonable estimate of annual maintenance cost as a percentage of initial cost, and a source for that number? I suppose...
  2. Engingguy

    Rebar placed after concrete placement has begun!

    I am researching standards for someone (and thankfully it is not my project). The contractor did not have all the rebar in place before he began to place the concrete, and began to stick it in after the concrete was in the forms. I believe the last of it was DRIVEN in after the concrete had...
  3. Engingguy

    Maximum Credible Earthquake

    Hello, I am working on a project, and a comment received on a submission suggested “adding consideration for peak horizontal velocities associate with a maximum credible earthquake and/or operating basis earthquake”. The project is located in an extremely seismically stable area (in the US),and...
  4. Engingguy

    Spiral reinforcement of round column, pitch/spacing

    I am designing a reinforced concrete column, 24" diameter, with 1.5" cover. f'c = 3000 psi, fyt=60,000 psi.I find the minimum volumetric reinforcement ratio to be 0.069. By ACI-318, looks like I can choose from #3,4,or 5 bar for the spiral. With the diameter of the core as it is (21"), I get a...
  5. Engingguy

    Overturning Moment from Stagnation Force

    In the case of a moving stream that exerts force on a dam, should the moment arm of the Fstag for overturning the wall be H/3 (as with hydraulic force) or H/2? Or something else entirely? Thanks in advance, Engingguy
  6. Engingguy

    Shear strength of rebar

    Hello folks, I generally use a shear strength of 0.6 Fy for rebar, but I can't find the reference in ACI 318-14 for a shear factor. I have seen values from 0.5 to 0.75 Fy used,so my 0.6 seems a safe middle value, but for the life of me can find no reference to where that comes from. Can anyone...
  7. Engingguy

    Stagger distance for rebar lap splices

    I am looking in ACI 318-14 for a spec for the stagger distance between lap splices but can't find one. I am using #4 epoxy coated rebar, 60,000 psi. Concrete is 3000 psi and the splices are Class B. I need to come up with a better splice detail note than "Just stagger the splices so the concrete...
  8. Engingguy

    Salt building construction joint filler

    Hello. I am designing the foundation and walls for a small salt storage shed. Any suggestions for a brine resistant filler for the slab joints? Construction joints in this case, not control joints. I am also specifying stainless steel dowels for load transfer. I was thinking of epoxy coated...

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