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Recent content by todh

  1. todh

    Wind Exposure B or C?

    The prevailing wind direction is from the SSE blowing NNW (yellow line in image). Trees are mainly deciduous.
  2. todh

    Wind Exposure B or C?

    I was hoping the collective good could provide me with an independent second (or third, fourth, fifth, etc.) opinion. We are designing a building immediately east of the building shown in the center of the 1,500 foot circle (see attached image). Our building will have a mean roof height of...
  3. todh

    PEMB foundation for moment reaction

    We actually received preliminary drawings from two separate manufacturers and the reaction was the same (essentially). It is extremely high though. The typical baseplate is 1' x 5.5' and has 12 1-1/4" diameter anchor bolts.
  4. todh

    PEMB foundation for moment reaction

    I have designed a lot of PEMB foundations in fat clay that are founded on under-reamed or straight drilled shafts in fat clay. All but one of these foundations had simple pinned connections for the rigid frame to the foundation. One previous (and now another) have moment reactions transferred...
  5. todh

    Tilt-up concrete panel cracks at connections

    BAretired, The contractor is scheduling a meeting between the PEMB engineer, the tilt-up wall panel engineer and myself. I envision myself more as an mediator that will make sure the two other engineers have thought of these issues and not assumed that each other was handling it when in fact...
  6. todh

    Tilt-up concrete panel cracks at connections

    The building is in the Texas Gulf Coast, so no seismic, only hurricane force winds (120-mph). The mezzanine is supported on the exterior by the PEMB rigid frames, so it is all tied together. You are right that there is no independent bracing for the mezzanine. The connection is detail 2 on...
  7. todh

    Tilt-up concrete panel cracks at connections

    I reviewed the metal building and wall drawings. I see no indication that there was any allowance for the panels to take the lateral loads for wind bracing. However, I may simply be overlooking something obvious so I am attaching a redacted version of the drawings in...
  8. todh

    Tilt-up concrete panel cracks at connections

    @ BARetired - The real problem is that there is no true Engineer Of Record for this building. The PEMB engineer and the foundation engineer (who also designed the tilt-up panels) most likely never talked or coordinated anything, but left the coordination up to the contractor which hired each of...
  9. todh

    Tilt-up concrete panel cracks at connections

    The panels span horizontally. They are connected to the foundation also, but not to the roof via an eave strut or any other way. They were not supposed to be used to brace the steel, but duing my inspection I did observe that there was no wind bracing or moment frames for lateral loads...
  10. todh

    Tilt-up concrete panel cracks at connections

    @ron9876 - The reinforcement at the panel edge consists of 2 - #5 bars. The embedded plates are 8"x8" and are aligned on one edge with the panel edge. The centerline of the column is the edge of the panel.
  11. todh

    Tilt-up concrete panel cracks at connections

    @ JAE - This is not an end panel. The free end you see is the edge of an overhead door opening. The photo was taken in the middle of a 200' long building. The bottom of the panel is restrained. There are 3-4 embedded angles in the bottom of the wall panel which are welded to embedded angles...
  12. todh

    Tilt-up concrete panel cracks at connections

    Close-up of cracked connection... http://files.engineering.com/getfile.aspx?folder=4d3aefa1-6fdd-4161-b569-eb12d246fc63&file=2011-02-17_15.02.34.jpg
  13. todh

    Tilt-up concrete panel cracks at connections

    A client asked me to look at a building that another engineer designed for him. The building is a pre-engineered metal building with a concrete tilt-up wall panel facade. The typical concrete panels are 25' wide (one bay width) and approximately 25' tall. The panels have embedded (8"x8"x3/8")...
  14. todh

    Analysis of Existing Concrete Slab

    sklev, I think you need a better GPR company. I am a structural engineer that also happens to own my own GPR equipment (although I don't do a lot of GPR). You should easily be able to determine the spacing, depth of the reinforcing steel and thickness of the slab as long as you have a known...
  15. todh

    Concrete floor strength in Brazil

    That was a thought I had as well as it equates to approximately 2,000 psf. However, there is a lot more to it then just concrete strength if that is the case. This is for site pavement and for slab-on-grade, so obviously as a safe load for the floor then you would also need information on the...
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