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  1. grogannc

    Best Software for Full Concrete Building?

    Can you walk me through some of the advantages of decoupling the foundation. This is a multi domed full concrete structure and all foundations are on a mat/raft. It's European style design/contrstruction. In fact they are flying in a contractor from Greece to build it.
  2. grogannc

    Best Software for Full Concrete Building?

    Need to model a full concrete structure, concrete walls, mat foundations, floors, beams, ceilings, even a dome. Any suggestions on something other than ANSYS (which I've used for something similar albeit a much bigger structure.
  3. grogannc

    Retaining Wall Design Sanity Check

    I went to the site the other day and its barely 0.5 inches, in some places its more like 0.375. To my surprise when I got there the wall was 11'-11" from grade but only about 9'9" of soil is going to be retained. So if you run the numbers based on that, there is significant margin in the design...
  4. grogannc

    Retaining Wall Design Sanity Check

    A little bit over 1900 psf. Yes in the kern and used retainpro software (now enercalc) for the design. I felt like I was already pretty conservative with the internal friction angle as this area primarily has clay soils and there was DCP testing down to 3ft below grade where they had 15+ blow...
  5. grogannc

    Retaining Wall Design Sanity Check

    Thanks for the replies. This is for a wall that was built a few months ago and compacted around 3 weeks ago. In the three weeks, the top of the wall has displaced 0.5 in per the Owner. I am trying to get information from the geotech as to what they used for backfill. The Owner mentioned he...
  6. grogannc

    Retaining Wall Design Sanity Check

    Would someone mind taking a look at the detail below and doing a sanity check?
  7. grogannc

    Hollow Core Plank Stirrups?

    That picture is a little misleading-I should have said, the holes are not circular, more rectangular, the holes run lengthwise (24ft span direction). I found a post on here where someone mentions mild steel reinforced planks encountered on a roof deck, which if so would I guess explain the...
  8. grogannc

    Hollow Core Plank Stirrups?

    The planks are 4ft wide x 24 ft long and the exposed steel runs in the 4ft direction. I think I have seen this one other time but I can't for the life of me remember which project. Its definitely odd but there's got to be some strands in the 24ft direction or it wouldn't still be standing.
  9. grogannc

    Hollow Core Plank Stirrups?

    These panels are from the 70s. It almost looks like CMUs where its been pressed?
  10. grogannc

    Hollow Core Plank Stirrups?

    When I first looked at it, I thought they were strands too. And maybe they are but they would only be 4ft long strands as thats the length of the panel in that direction. I've never heard/seen of anything like that? And then the spacing is so tight, that would be something like 50 to 60 strands...
  11. grogannc

    Hollow Core Plank Stirrups?

    Thats what I thought. Did you see the picture? What am I looking at? Have to design some repairs to this deck.
  12. grogannc

    Hollow Core Plank Stirrups?

    Dumb question but do hollow core planks normally have stirrups in them? I can't seem to find any info on it. https://files.engineering.com/getfile.aspx?folder=3d5bf527-45ac-4c52-9d03-392189170850&file=20240710_155259.jpg
  13. grogannc

    Slab on Grade Partial Upfit Retail Shell Building

    I usually am designing the shell building and not part of the upfit after the shell is complete. But for this particular project, the upfit had a partial mezzanine (which has since been VE'd). What do you guys do at the edge of the adjacent tenant space? Slab is just a typical 4" slab. Do you...
  14. grogannc

    Support of Existing Steel Trusses at Panel Point?

    You are correct-at the first bottom panel point. Thanks for the input. I am in the same camp. Intuitively is seems fine but just wanted a second opinion. I'll probably end up at least modeling half of it to see the behavior change.
  15. grogannc

    Support of Existing Steel Trusses at Panel Point?

    I have a residential project where the elevated back patio (~5 ft) is supported by steel bar joists and decking. Due to some waterproofing issues, the ends of the joist (bearing seat on one side) are severely rusted. The span of the joists is 13.5' and max reaction loads would be ~1000 pounds...
  16. grogannc

    Cutting Small deck footings into geogrid/retaining wall

    It just keeps getting better. Because they dug so deep what was a small hole turned into a 3'x3' hole.... I think they are just going to have to dig out wider in the hole locations at each column and lap the mesh per standard type details. Basically rebuild the wall in those locations. Don't...
  17. grogannc

    Cutting Small deck footings into geogrid/retaining wall

    Not sure how big the cut is. Hopefully its just a 12x12 and nothing bigger. I'm gonna guess its right at the wall. Maybe a foot or so back. I'll take some measurements on Friday. I believe its a fairly new wall but since its 4 ft (our code doesn't require an engineered wall 4ft and less) to 6...
  18. grogannc

    Cutting Small deck footings into geogrid/retaining wall

    So I spoke with the contractor and apparently they have already cut through the geogrid all the way to the bottom of the wall and sounds like the county won't pass it without a stamp on it. Going to look at it on Friday. Always nice when they pull the engineer in on the back end. Frost depth...
  19. grogannc

    Cutting Small deck footings into geogrid/retaining wall

    Its a segmental wall ranging from 4' to 6'. There are a couple layers of geogrid in it. Contractor wants to put a couple of 6x6 deck posts with probably a 12x12 concrete footing in the reinforced zone. Any tips on how to accomplish this? First thought was to go down to the base height of the...
  20. grogannc

    Plastic Modulus

    I used to do a lot of work in the non-linear region. As said you would be talking about the tangent modulus using ultimate stress/strain. This would be what material models define as a bi-linear curve that you see in FEA a lot. The interesting part of non-linear analysis is that beyond yield...

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