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  1. Rabbit12

    AWWA D100 Tank Corrosion Allowance

    Looking for some input on typical corrosion allowances for D100 welded steel water tanks. Working on a spec and I want to be reasonable compared to an industry standard. The D100 standard doesn't provide any specifics that I can find. Any experience on this forum?
  2. Rabbit12

    AWWA D110/D115 Tanks

    Working on a project that has performance specifications for both D110 and D115 specs. Our D115 spec language requires bonded tendons throughout. The D115 tank guy doesn't like this requirement because it adds cost to their tank. I understand their consternation, but I really don't know if we...
  3. Rabbit12

    AWWA D110/D115 Tanks

    Working on a project that has performance specifications for both D110 and D115 specs. Our D115 spec language requires bonded tendons throughout. The D115 tank guy doesn't like this requirement because it adds cost to their tank. I understand their consternation, but I really don't know if we...
  4. Rabbit12

    Stainless Steel Exposed to Free Chlorine Gas

    Have a project where we are having issues with corrosion of stainless steel. The issue is occurring in the head space of a mostly buried clearwell. The top slab is exposed and maybe a foot or so of the walls. Overall depth is 30' or so. We have generally used 316 stainless steel in these...
  5. Rabbit12

    HVAC Duct Collapse - Gaylord Hotel - Denver

    Some HVAC duct collapsed in the swimming pool area of a hotel in Denver over the weekend. No one was killed but injured several. Looks like some pretty heavy-duty duct work. No word on cause but one has to think corrosion whatever was used to hang the duct is a likely culprit...
  6. Rabbit12

    A36 vs Temperature Strength Chart

    I'm looking for a strength vs. temperature graph or table for A36 steel. I'm not having much luck finding that information. Anyone have a reference they can point me to?
  7. Rabbit12

    Contractor Revising Documents

    This is a new one for me. Awhile back we had a contractor submit a set of shoring drawings/calcs. Our specs require the shoring be designed by an engineered and stamped/sealed. The first submittal was great. Engineer wrote a letter, provided a drawing, we accepted...everyone is happy. Fast...
  8. Rabbit12

    Determine Rock Excavation Difficulty

    Have a project where we will need to excavate a large amount of rock to build some tanks. We have a preliminary geotech report that gives us an RQD (varies from 73% up to 100%), and an unconfined compressive strength (279 psi). This is claystone. From those values any way to determine...
  9. Rabbit12

    Light Pole to Handrail?

    Thoughts on this? I know there's been some discussions on here about handrail posts and how it's tough to make those work on paper. What if you also add a light pole and a luminaire to the handrail? I can't imagine someone being on a service platform in a design wind event, but could see...
  10. Rabbit12

    ACI 350 Flexure

    I've read a handful of past threads on this, but wanted some assurance I'm doing this correctly. To determine the design moment we take: Sd*Mstrength This would then be compared to M=As*Fy*(d-a/2) I'm checking a design that calculates Sd=fy/fs (assume phi and gamma are 1.0) and then take...
  11. Rabbit12

    Pre-Engineered Metal Building Roof Rod Bracing

    I've designed a few foundations for metal buildings but I don't claim to be an expert on the load path the PEMB manufacturers use. My question is specific to the rod bracing you commonly see in the roof of these structures. They installed some rod bracing that is bent pretty bad. I got a...
  12. Rabbit12

    Lateral Earth Pressure Question

    I'm doing a preliminary analysis on a buried structure from the early 1960's. Reviewing a Geotech report from the same site and they are recommending a lateral at-rest pressure of 60 pcf above the GWT and 100 pcf below the groundwater table. Then they have this tidbit: "The values...
  13. Rabbit12

    Point Load on Pipe

    I have a situation where we have large diameter S10 stainless steel pipe that will be supported off a wide flange. My reviewer made a comment to consider the reaction on the wall of the pipe to make sure it doesn't bend our pipe wall. I thought that would be relatively simple using AISC...
  14. Rabbit12

    Anchor Pull Test

    I have a situation where I need to pull test some adhesive anchors. Is there any other guidelines to testing other than IBC Chapter 17? I'm specifically looking for guidance on appropriate factors of safety, load test requirements, and load duration. In the IBC they reference keeping the...
  15. Rabbit12

    Letter of Compliance

    Got myself a little ethical conundrum. Had a contractor call yesterday saying they didn't get inspections during construction and not the county is asking for a letter of compliance from the EOR. I wasn't on-site once during construction so this is an obvious problem. The contractor has...
  16. Rabbit12

    Concrete Cracking

    See attached picture. We have a product where we place two slabs; one on grade and one elevated. The slab on grade was cured with a cure and seal product while the elevated slab was flooded after finishing. Both slabs have cracked like you can see in the picture. To me it appears to be craze...
  17. Rabbit12

    Historical Robertson Deck Load Tables

    I'm in need of a bit of help finding loads for a deck in an existing building. The building drawings are from 1969. I found the following note on the drawings: "3"x18GA steel deck shall be Robertson QL-21 and QL-NKX, or Inland Hi-Bond 3N or 3NF". I found this old thread with a link to Inryco...
  18. Rabbit12

    Angle Leg Local Buckling

    I'm looking for thoughts on the appropriate value of Sc for angle leg local buckling in section F10.3 of AISC 360-10. The code gives some guidance for equal leg angles in that Sc is 0.8 times geometric axis section modulus. But what about for unequal leg angles? Should I be using Sz...
  19. Rabbit12

    Density of A500 Steel

    Discovered something interesting yesterday. I was defining a material in Risa 3D and I noticed the density of A500 Gr. B steel was 527 lb/ft^3 as a default. Everything else was 490. I asked around the office and out of 6 people, Risa used 527 for the density for three people and 490 for...
  20. Rabbit12

    Welded Anchor Rod Corrosion Repair

    We are working with a client on replacement of a vertical process vessel. The new vessel was grandfathered onto the existing foundation using IBC chapter 34. There was only a small increase in weight so they will take the old vessel off the foundation and replace with the new vessel...

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