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  1. jdonville

    Soil Nail Wall with MSE Wall Facing

    If you must have the look of precast panels, I'd look hard at using form elements or tooling to mimic the appearance of these panels in the permanent facing, OR I would use the precast panels as the form itself and cast-in-place the permanent facing between the precast and temporary shotcrete...
  2. jdonville

    Pile Working Load

    I've always assumed it's the straight unfactored load.
  3. jdonville

    Cantilever Retaining Wall Sliding

    haynewp, The passive deflection in the table only applies when there is a net force that will tend to push the wall into the retained soil. For passive resistance at the toe in clayey soils, deflection at the toe should be very modest.
  4. jdonville

    Design of Solider Pile Wall

    t230917, You know you could just pawn this off on a specialty contractor as a design-build project, right?
  5. jdonville

    Where is the market for geotechnical engineers good right now

    Here's hoping thing return to a semblance of "normal" by then...
  6. jdonville

    Soil punching shear failur

    The project should have had a soils investigation performed. Contact the geotech of record. If no investigation was performed, contact a local firm and get an investigation done.
  7. jdonville

    Crane load surcharge on retaining wall

    So for strip loading, my university text says, p = (q/pi)*[beta - sin(beta) x cos(2 x alpha)] = lateral pressure ordinate at a depth z below the strip for an elastic medium beta, alpha are expressed in radians alpha = angle between vertical and midpoint of strip measured from depth z below...
  8. jdonville

    Multi-axial loads on fillet and increased capacity for transverse loads

    From the theory, theta is the angle between the load and the long axis of the fillet weld. So I would use the angle on the plane containing both the true 3d resultant angle and the long axis of the weld.
  9. jdonville

    Crane load surcharge on retaining wall

    Lomarandil, For reinforced concrete construction I would conservatively assume the "doubled" approach. I am taking that approach for a current project... Ayush, The load radius is ~200ft!! For a 2500lb load, I would look very hard at using a smaller (RT?) crane at a much shorter radius unless...
  10. jdonville

    Drilled Shaft with Both Permanent and Temporary Casing

    Then I don't understand what warrants wrapping the vertical bars above the top of pile with confining steel. Presumably, the reinforcing steel for the pile cap should handle the load transfer to/from the vertical bars, no?
  11. jdonville

    lateral force design for a retaining wall.

    If you know for a fact that the wall is deficient somehow, then you have a professional obligation to inform the relevant authorities to protect the safety and well-being of the public.
  12. jdonville

    Drilled Shaft with Both Permanent and Temporary Casing

    Is the section above the top of pile circular, then?
  13. jdonville

    Drilled Shaft with Both Permanent and Temporary Casing

    STructPono, Unrelated to your question, but why do you show spiral and hoop reinforcing (which also appears discontinuous with the spiral on the cage below top of pile) extending above the top of pile?!
  14. jdonville

    Ties in Auger-cast piles

    I only suggested the rolled shape for full-length flexural or axial reinforcing. (We do this using our ACP rigs for earth retention where vibration concerns prevent driving piles.) For tension resistance, all you need is a threaded bar centered that can take the tensile loading. These can be...
  15. jdonville

    Beam Splice - Welded with Limited Access

    XR250, Weld symbol shown seems to be double-sided fillet weld - opposite edges of plates to flanges/web. Not sure where you got "all-around" from. Deener, Suggest that the shear splice plate be rotated 45 deg (oriented as a diamond) to minimize the overall dimensions of the plate. As...
  16. jdonville

    Ties in Auger-cast piles

    @MOJOJOHN, Designing as columns can be overly conservative as the earth provides generally increasing confining pressure as a function of depth, except for any portion of the pile anticipated to be exposed/unsupported during service (e.g., due to scour or very poor soil conditions). IIRC, the...
  17. jdonville

    Drilled Shaft with Both Permanent and Temporary Casing

    STrctPono, I don't know what the RFI was asking if you are quoting accurately. With regard to my response above, the annulus could be filled in a few ways that I can think of - tremie placement of cementitious material, likely low-strength, or placing uncompacted sand either free-fall or...
  18. jdonville

    Drilled Shaft with Both Permanent and Temporary Casing

    I have seen oversize temp casing used to install permanent casing of nominal pile dia. Concrete is placed in the permanent can with some material placed around the bottom to ensure that the concrete does not float the permanent casing during filling. Let cure overnight and pull the oversize...
  19. jdonville

    Temporary Telescoping Casings for Drilled Pier in Uplift

    So with telescoping casings, the sticking point is that casings will need to be removed as the concrete is placed in stages. The overlap between the telescoping casings needs to be long enough that they can remove the inner (bottommost) casing and still have the next casing contain the slumping...
  20. jdonville

    Tapped Hole Capacity

    If this is to be used for lifting application, then while it might have satisfactory capacity from a structural point of view, there are requirements, at lest in USA, for the design of "below the hook" devices for lifting applications. You can get by with smaller reserve capacity for one-off...

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