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  • Users: gte447f
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  1. gte447f

    Repair for Segmental Retaining Wall Undermined at Base Course

    I am assessing a situation involving an existing segmental retaining wall (SRW) that is undermined at the base course due to inadequate embedment of the base course(s) below grade. The wall is approximately 150 feet long and approximately 16 feet high (maximum). The adjacent grade at the toe...
  2. gte447f

    Wood Diaphragm Stiffness, Ga

    According to NDS SDPWS Table 4.2A "Nominal Unit Shear Capacities for Wood Frame Diaphragms", 15/32" sheathing w/ 10d@6" edge nailing is stiffer than the same sheathing with tighter nail spacing (i.e., 10d@4"), and is also stiffer than thicker sheathing with the same nailing pattern (i.e., 19/32"...
  3. gte447f

    Bottom Chord Bearing Truss w/ Raised Bearing Seat

    I am designing a building with flat, bottom chord bearing, metal plate connected, wood roof trusses. The truss span is approximately 45 feet. I am thinking the bottom chords will probably be 2x6 oriented in the strong direction. The bearing walls are wood stud walls with a 2-2x6 top plate...
  4. gte447f

    Re-use or replace existing joist hangers

    See attached detail. This is a work in progress. I am designing a repair plan for an existing, residential, exterior deck. The columns are rotted at the base and the edge beams are under sized, among other problems. This is a large, wrap around, 2-story deck, that will be very expensive to...
  5. gte447f

    Cracked Wood Floor Joist

    See the attached images. I came across this cracked floor joist in a the crawl space of a single family residential building. It's the joist just to the left of the HVAC duct and just to the right of the plugged foundation vent. Any ideas what has caused the crack? This is the only joist...
  6. gte447f

    Client/Owner tells you upfront he intends to build without a permit

    A prospective new client was referred to me by an architect. The prospective client is a home owner that is planning to build an addition on the back of his home. He also apparently holds a residential/light commercial general contractor license in my state, but he says he doesn't work as a...
  7. gte447f

    Septic Tank Minimum Design Loads

    I am assessing a situation for a residential homeowner who has discovered that a wood post supporting part of an exterior deck is located on top of a septic tank. The tank is buried approximately 2 feet below grade. The post is an 8x8 timber post approximately 15-20 feet tall with a tributary...
  8. gte447f

    concrete crib retaining wall repair options?

    I am looking at a concrete crib retaining wall that is loosing backfill through the face of the wall during heavy rain events. There is an obvious surface water drainage problem that is contributing to the loss of backfill through the face of the wall, in that their is a tennis court upslope...
  9. gte447f

    looking for creative way to repair/replace rotted floor sheathing at exterior wall

    I have a building envelope rehab job where exterior stone/stucco veneer is being removed and replaced because it has been leaking. My role as structural engineer is to diagnose and specify repairs for any wood framing that is uncovered that has been damaged by wood rot (fungal decay) as a...
  10. gte447f

    concrete working stress in early 1900's building codes

    I have a small concrete repair project that involves a building originally constructed in 1901. I have been researching building codes from that era and have come across limits on working stresses for compression in concrete of around 230 psi, which seems very low to me. Is this the stress...
  11. gte447f

    Do you stamp site visit reports during construction?

    Structural engineers, do you stamp site visit reports during construction? These are not Special Inspections. These site visits are to make observations for general conformance with the Construction Documents. The reports will usually include a description and some photos of the general...
  12. gte447f

    2.5" line pump for placing slab on grade concrete?

    I have a project with a 5" slab on grad. The concrete spec'd was 4500 psi, max w/c ratio 0.45, max coarse aggregate size 1" (but 3/4" is commonly used in mix design around here), air entrainment 4.5% or 5% plus/minus 1.5% for 1" or 3/4" max aggregate size respectively, and max slump of 5". The...
  13. gte447f

    Wood Shear Wall Corner Details and Anchors

    Looking for consensus or opinions on common ways to frame exterior corners when both walls that intersect at the corner are shear walls. How many studs do you typically use to build up the corner (I know this could vary depending on the shear wall chord forces, but assume 2 minimum are required...
  14. gte447f

    steel beam bearing plate on concrete wall

    Isn't there a code requirement that says something about the distance between the face of a concrete wall and the edge of a steel bearing plate on top of the wall? I seem to remember a minimum or maximum distance of about a half inch. Does this sound familiar to anyone else? I honestly can't...
  15. gte447f

    Floating slab on grade detail at exterior door

    For a floating slab on grade, what is best practice at an exterior door? I assume the slab edge should get extended to the outside face of the wall. Does the slab edge need to be thickened? If so, how much, or should it be turned down onto the strip footing/grade beam? It seems to me that if...
  16. gte447f

    isolated wall footing vs thickened slab edge

    I have received a request for a change from an isolated wall footing to a thickened slab edge supporting a CMU wall. Both details are attached. The contractor states that they prefer to pour the slab before building the CMU wall because the slab will protect the subgrade from rain and...
  17. gte447f

    pea gravel vs 89 aggregate

    I have a job where PVC stay in place wall forms will be used. The forming system supplier's literature says to use a "pea gravel" 4000 psi concrete with a slump of 4-5. I indicated "pea gravel" coarse aggregate on my drawings. I have received a concrete mix design submittal that is using 89...
  18. gte447f

    Help with lag screw lateral capacity calculation

    Anyone care to take a look through the attached calculation sheet for lateral capacity for a 1/4" diameter lag screw. I think there is an error in the calculation, but I cannot find it. In the attached calculation the controlling yield limit equation is Mode IV which is 105 lbs. However, the...
  19. gte447f

    Base plate modifications for misaligned anchor rods

    The anchor rods for a column were supposed to be set in a 1'-4" square pattern, but instead they were set in a 1'-2" square pattern. The column is part of a moment frame. It is a W10x112, the base plate is 2" thick with 2-5/16" diameter holes, and the anchor rods are 1-1/2" diameter with...
  20. gte447f

    preservative treatment for log homes

    I'm seeking some guidance on the requirements for preservative treatment of logs used in the construction of log homes. I have a situation where a builder wants to use (actually has already constructed) some southern pine logs as posts to support porch roofs and exterior decks. He got the logs...

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