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Recent content by Ibeam

  1. Ibeam

    A-Bolt Pullout for Base Ring

    Please see the following thread posted in the "Concrete Engineering General Discussion" forum. thread592-187934: Anchor Pull-out for Base Ring.
  2. Ibeam

    Anchor Pull-out for Base Ring

    I'm having some trouble using ACI 318 Appendix-D for determining embedment length for pull-out. Situation: I have an octagonal shaped pedestal/cap, 16'x16', supported by drilled piers. The foundation supports a round vessel, 13'-6" diameter. The moment at the base of the vessel creates...
  3. Ibeam

    Min. ftg Depth for Exterior Slab

    All are interesting comments - I realized that 12% fines may be an issue on one hand, but the other is the impermeability after compaction. I didn't want the bathtub effect. The geotech on the job says that he deems the type-A base material as "non-frost" susceptible fill. A friend here at...
  4. Ibeam

    Min. ftg Depth for Exterior Slab

    Type-A base material here is a well graded 1.5-inch max aggregate with 4-12 percent passing the No. 200 seive. It compacts tight. The ground water is approx. 10 to 13 feet. There were 4 borings to rock (avg. 50 ft.) within the footprint. Unlike civilperson's example, this slab cannot have...
  5. Ibeam

    Min. ftg Depth for Exterior Slab

    My question is about frost depth requirements for an outdoor industrial slab on grade. Minimum ftg depth for frost penetration is 24 inches. Slab size is 70 x 80 ft. I have numerous pieces of equipment – tanks, pumps, platforms, pipe supports, vessels, all light to moderate loadings in that...
  6. Ibeam

    Drilled Piers in Low PH Environment

    Hmmmm... I pick curtain #3! There are a number of large areas at this industrial site that are EPA designated "No Dig Zones". There is a river that runs 100 yards from the property line, and I understand that where these particular foundations are is part of the old riverbed. They hit it at...
  7. Ibeam

    Drilled Piers in Low PH Environment

    Thanks Ron, I've been waiting for additional responses but it doesn't look like any are forthcoming. It hadn't occurred to me of coating the casing - would you recommend a bituminus, galvanized, or epoxy type coating such as an Ameron system? The layers of soil being penetrated go from fat...
  8. Ibeam

    Drilled Piers in Low PH Environment

    Monday morning crisis: A project we're doing at an industrial site utilizes 30-inch drilled pier foundations to rock. The holes have been filling up with water soon after drilling. Environmental testing is performed for contaminents during and after drilling. The last pair of drilled...
  9. Ibeam

    Potential Settlements from heavy Rain

    I asked the geotech to pay of site visit and give some recommendations. He had 9 test pits dug 3 ft. deep. The soil (silty clay and some clayey silt) below the lime treatment was competent enough for normal operations to proceed. The lime did a good job of protecting it from flooding, and the...
  10. Ibeam

    Footings Freezing

    1. You don't want the soil to lose compaction by freeze/thaw cycles. It's not frozen down there and you want to keep it that way. 2. You don't want your concrete to freeze while it's trying to cure. 3. When you say the poly will great a greenhouse effect, you just mean that during the day it...
  11. Ibeam

    Potential Settlements from heavy Rain

    This is a question about overly wet soils: We’re putting in a cantilevered retaining wall for secondary storage around AST’s for Fuel storage in Sacramento, CA. This is a new site, with no other structures in the immediate area. The ground was very flat with a water table around 11 ft. below...
  12. Ibeam

    Reuse of pre-engineered building. Concerns?

    Girt/purlin depths - I had an experience of refurbishing and adding on to an existing metal building, built in the 70's, a few years ago in Lakeland Florida. The secondary members were all 6 inch depth. With today's wind loads and available sections on the market, I had to replace with 8.5"...
  13. Ibeam

    Cross bracing in Compression

    You're speaking about the stiffness matrix. If the design is by hand, then you do need to set some limitations as the previous posts imply. But it's all about deflection/flexibility/stiffness, something we usually let a frame program figure out. Probably most of us have solved a stiffness...
  14. Ibeam

    "at rest" vs "active" earth pressure

    Grizzman, I consistently have a run-in with the same quandary when doing retaining walls. Here's the way I see it - reinf. concrete of the stem wall more than likely experiences the at-rest pressure, so design the reinf with that in mind. But for stability, it seems that active and passive...
  15. Ibeam

    Mis-placed base plate

    I had a misplaced base plate not too long ago and I did the following: 1. welded a plate extension on to pick up 2 cast-in-place anchors that fell outside the plate. Used a gusset to strengthen the new addition. 2. burned 2 new holes in the original plate to pick up the other 2 anchors. 3...
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