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  1. oldrunner

    Monopole tower foundation

    I've got one pole foundation that's about 56 foot square and 8.5 feet thick. Had a water table issue. Pole is 426 feet high with a big gold crown.
  2. oldrunner

    Existing Foundation Corrosion mitigation / repair

    Had a similar problem with slabs sitting on salt laden sand and corrosion set in. The "consultant" for the contractor had a design to "seal" the sides of the slab to stop the corrosion. They didn't consider the salt water underneath the slab. Initially our corrosion consultant recommended...
  3. oldrunner

    Fill for detached garage

    You are building your garage on a fill?? Well it's going to move and settle and not necessarily evenly. I would have this as either a very stiff floating slab where portions of the slab will span over settled areas or a ribbed slab that's also very stiff. And if the fill isn't the same depth...
  4. oldrunner

    ASCE 7 - Transformer Foundation Design - SDC B

    Is the transformer being designed for IEEE 693? If it is and the seismic documentation is for low seismic, then at least .10g for the transformer. Check IEEE 693 for the requirements for the foundation seismic design which may be different from the IBC.
  5. oldrunner

    Footer reinforcing

    Do you have any idea what kind of soil you are putting your building on? If it's expansive, even a couple of bars won't keep it from moving around. I would have hoped that with your architecture training you would have also received some basic engineering training. For example, we can "away...
  6. oldrunner

    Gridded Continuous Footings

    In regards to aspix, the Australians seem to be way ahead of the US in addressing differential settlement. Where our prescriptive continuous footings will call out two bars, one top and the other bottom, I’ve seen their continuous footings with three bars on top and three below and the footing...
  7. oldrunner

    Tower Foundation Design

    I don't think so.
  8. oldrunner

    Tower Foundation Design

    Chapter 13 Foundation Design of the Highway Signs, Luminaries and Traffic Signals (AASHTO LTS-4)provides guidance for poles. In the US, monopole design is per the ANSI/TIA-222-G (or later) but it does not provide actual formulas similar to the AASHTO recomendations, but does provide some...
  9. oldrunner

    Tower Foundation Design

    First: You do need a geotechnical report. For estimating purposes you can use the generic formula in the IBC foundation chapter, substituting a trial depth until it closely matches the calculated depth. For this trial example you need the passive pressure provided by the geotech. He also...
  10. oldrunner

    Unreinforced caissons ???

    Are the caissons cased? What size are they?
  11. oldrunner

    Foundation of a Tower - Moment in two directions - Overturning control

    Is that really true? You mean that if I have a allowable bearing value of 3000 psf, that as soon as the tower's footings corner reaches this bearing value, that the soil will sink? What happened to my factor of safety (of the allowble bearing capacity)? A little tongue-in-cheek tonight.
  12. oldrunner

    Foundation of a Tower - Moment in two directions - Overturning control

    On page 117 of the Handbook of Concrete Enginering there is a chart of values for forces parallel to the diagonal of a square footing which is handy. It will provide you with the bearing pressures and the area being loaded if there is uplift.
  13. oldrunner

    Drilled Pier Foundations for 35' Mast Arms

    This sounds like a single pier that can rotate due to torsional loads on the upper arms and/or unbalanced loads on the wires. You also need to provide the start of the passive pressure below grade. The pier most likely will be deeper than six feet (the fill depth?), therefore you should be...
  14. oldrunner

    Guy Wire Foundation/Anchorage

    There are some details in ASCE Manual No. 91, "Design of Guyed Electrical Transmission Structures". Always use some sort of softener if you are bending the cable around a rod. Depending upon how the cable is connected there are some efficiency ratios that you should be aware of, as well as...
  15. oldrunner

    Lattice steel tower foundation design

    I'll be a little more charitable, as I have a good relationship with mechanical engineers as with we used to do a lot of heavy rigging together. Get a hold of the TIA/EIA-222 Standard (Purchase from Global Engineering Documents) and then also buy the latest edition of the "Wind Commentary...
  16. oldrunner

    Design philisophies for foundations of utility poles

    Review the following ASCE Manuals: No. 72 - Design of Steel Transmission Pole Structures and No. 52, Guide for Design of Steel Transmission Towers. Somewhat informative.
  17. oldrunner

    Buckling Capacity of a Partially Embedded Pile

    The reference book "Design and Construction of Ports and Marine Structures" by Alongzo DeF. Quinn has a section on the design of piles and cylinders for the support of docks. There is also some information on Wood Piles.

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