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  1. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    Let me start by saying thanks to all the replies. The way the form the beam is they put a wood form and several diagonal braces, it's a little shady. It is not uncommon for the bottom of the beam to sway out of plane just from the weight of the concrete. When you go look at some of these beams...
  2. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    UPDATE: OK, turns out, around these parts of the Country, they use good 'ole 6 Mil vapor retarder as their bagging material.... So, pure junk.
  3. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    Gentlemen, I see some confusion here. We're not talking about MSE walls here, If I could, I would - it's just plain sand bags, they refuse to do anything different other than stacking the bags together.... I took me forever to find a picture on the internet, see links. I have yet to find out...
  4. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    Well, in residential they put bags of soil behind the wall, and they go up to 10ft or so. The point of contention is, I believe I cannot rely on the bags holding up their own weight because there's no document -University, Building Code, etc- that says they can. So, I would like to design the...
  5. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    The soil is bagged behind the wall so no bracing is required. My issue is that nowhere have I found something that says the bags won't eventually burst or disintegrate and hence I'm being careful by assuming eventually there will be lateral pressure on the wall.
  6. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    No, it's a new slab. I wasn't planning to transfer the moment in the slab. I was hoping for the bottom of the wall to move enough to *hopefully* relieve the soil pressure and hence use the active pressure, which in turn, with enough beam depth I can rely on the passive soil pressure going the...
  7. StructuralEngineerTX

    At Rest Vs Active Soil Pressure... Bottom of Wall moving.

    Hello, I'm trying to design a retaining wall that has no footing but it's attached at the top to a concrete slab. That is, a slab on grade that has a very deep >10' exterior beam All the books I've been going through say that if the top of the wall moves then you use the Active soil pressure...
  8. StructuralEngineerTX

    Friction Force of Pipe embedded into concrete ?

    Thanks Ron, how did you come up with the 25 psi? If I can get 25 psi then with all that surface area I would have plenty of capacity.
  9. StructuralEngineerTX

    Friction Force of Pipe embedded into concrete ?

    Appreciate the comments. I'm not concerned with the moments. The real problem is the weight of the sign. It has masonry on both sides. It's pretty heavy. I don't want the weight to shear through the bottom of the pipe because there's no base plate (the bottom of the pipe is hollow so that...
  10. StructuralEngineerTX

    Friction Force of Pipe embedded into concrete ?

    Hello all, I'm designing a 12ft tall sign. The sign company says the steel Pipe column of the sign actually embeds into the concrete pier all the way down to the bottom of the pier (3" clear from bottom). I'm concerned about the Bond between the steel pipe and the concrete since this would...
  11. StructuralEngineerTX

    10ft Retaining Wall With only 12" soil behind it

    Well that makes a lot of sense. The pressure must be related to the amount of fill. There's no way 1ft of soil pushes with the same pressure as 10ft of soil. If that would be the case, then to create energy all you would need would be a tall skinny pipe with water and a generator. So, soil...
  12. StructuralEngineerTX

    10ft Retaining Wall With only 12" soil behind it

    OK guys, I appreciate the response... How are you coming up with 50 psf uniform? And yes, thanks for bringing up the drainage, it will be gravel with a perforated pipe at the bottom.
  13. StructuralEngineerTX

    10ft Retaining Wall With only 12" soil behind it

    Hi Everyone. Here's the problem. I have approx 10ft tall retaining wall. Behind the wall, there's stable limestone stratum, does not need a wall because it can retain itself. However, there will be a gap between the back of the wall and the face of the rock, about 12", which will be filled...

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