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  • Users: SperlingPE
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  1. SperlingPE

    GPR & x-ray concrete

    How good is ground penetrating radar? Can it detect reinforcing size? Typical situation, CIP building with no drawings of information on reinforcing. Is x-ray the better way to go to find reinforcing sizes?
  2. SperlingPE

    Concrete Accelerator

    What do I need to be aware of if accelerator is used for a concrete wall? Accelerator is being considered to be able to backfill sooner. It is an 18" thick, 14' tall foundation wall. It will be supporting first floor framing and have some columns bearing on it.
  3. SperlingPE

    Design of Below Hook Lifting Devices

    Good day, is there a specification or design guide for designing below hook lifting devices? A client has several in house made lifting devices that they would like to get a load rating on. Our thoughts are to do calc's if possible and apply appropriate safety factors. So I am trying to find any...
  4. SperlingPE

    Mis-placed anchor rods

    If anchor rods are mis-placed by inches, can post installed anchors be installed adjacent to the cut off anchors? My thought is that the cut off anchors would be like a piece of rebar in the footing. I should say that there is tension on the new post installed anchors. The cut off anchors would...
  5. SperlingPE

    Anchor Rod Placement

    The anchor rods for a PEMB project were placed in one of the following ways: 1. Concrete for the pad footing was placed, the anchor rods were pushed into the concrete, the concrete was consolidated. 2. Concrete for the pad footing was placed, the concrete was consolidated, the anchor rods were...
  6. SperlingPE

    Risk Category IV wind speeds v. tornado wind speeds

    A client is asking us to evaluate the differences in structure due to the wind loads from typical risk category IV wind speeds [120 mph] and an F2 tornado highest value wind speed [157 mph]. I explained that these are two different things (3 second gust and a possibly longer sustained wind...
  7. SperlingPE

    Concrete Shrinkage in Footings

    I am looking for an equation to predict the amount of drying shrinkage in a concrete footing. The footing sides will be formed by grade. Depth of footing will be 30"-36". Width will be 8'. Reinforcing will bar mats at the top and bottom. The footing will be excavated in an existing building...
  8. SperlingPE

    Floor Joist Damage & Splices

    I was asked to look at some floor joists - nominal 2x8'as @ 24" o.c. spanning 12'3". The joists are damaged at one end. The damage extends from the face of the foundation wall inward 5'. The damage is located in the bottom third of the joist. Some of the joists may have damage up further...
  9. SperlingPE

    Wood Framed Shear Wall w/ gypsum wall board and screws

    I am looking for shear wall values. The IBC 2009 had values. I am using IBC 2012 for this project. The table in IBC 2012 does not reference screws anymore. Is there an ESR report or something that has screw values for shear walls. Or can I use an IBC 2009 table for an IBC 2012 project?
  10. SperlingPE

    Floor Joists & Concrete Floor - Form material

    I am involved in a project renovating the mechanical system on an old building [early to mid 1900's]. The second floor is steel joists and concrete. There is a material in place that I assume was used to form the concrete floor. It is not corrugated metal deck, centering deck, etc. that you...
  11. SperlingPE

    Cast Iron Pipe Columns

    I am evaluating a early 20th century masonry building with interior wood framing and CI pipe columns. Is there any documentation or testing results on CI pipe columns?
  12. SperlingPE

    Old Wood Framing

    What do you do to determine engineering values for old wood framing? Early 20th century wood framing. Wood floor/roof joists that are actual size (2x12 is 2"x12"). Wood headers/beams. Will not be doing any on site load testing. Probably will not do any lab testing of individual pieces. I have...
  13. SperlingPE

    Existing 2 way concrete slab & point loads

    I have an existing 2 way concrete slab. New equipment will impart a short term point load on the slab. How can you calculate whether this slab will support this load? I can get the psf capacity of the slab. Would you convert the point load to an area load (psf)? What would you use for the...
  14. SperlingPE

    Concrete Slab on Grade Adjacent Pours

    I have a large industrial floor that is being poured with several different pours. I have asked for 7 days minimum between adjacent pours. Contractor wants to cut this to 3 days. Slab will be in an unconditioned warehouse type building [some heat in the winter]. So slab is subject to...
  15. SperlingPE

    Plate design

    I am reviewing some drawings for a façade structure on a building. There are perforated plates called out and a gauge of plate is given and the supports are clearly indicated and dimensioned. I am checking these as if they are beams. Is there other procedures to use for plate? Some of the...
  16. SperlingPE

    Welding two plates of varying thickness

    I have a field situation. I need to weld two beams together at the flanges (one on top of the other). One flange is 7/16" and the other is 7/8". This will be field welded with fillet welds along the seam between the flanges. Fillet welds will spaced not continuous. Is there anything that...
  17. SperlingPE

    ROOF DECK PROFILES

    I have an existing metal roof deck profile that I am trying to match so that I can nest new deck with it. The deck measures 1 5/8 from underside to bottom. Between the ribs it measures 5"
  18. SperlingPE

    Auger Cast Piles

    The tolerance for location for the auger cast piles is +/- 3". Several piles have been placed from 4" to 11" from required location. Most of the piles are overlaid by a continuous pile cap. All of the misplaced pile caps are still under the continuous pile cap. However, they may be closer to the...
  19. SperlingPE

    Need a Consultant

    I am working with a company to design a pressure test pit. I am looking for a consultant (mechanical specialty) to help interpret or convert the release energy numbers that I have been given into forces that can be used to design the structure. Has anyone run across something like this before?
  20. SperlingPE

    Moment Connection W beam to HSS round tube

    I am looking for resources for moment connection design for W beam framing into a round HSS. The round HSS is a corner column. The W beams frame into the column in 4 directions. Two of the beams are cantilevered. The other two beams are supported at their other end. In addition, there is...

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