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  1. MillR

    Structural Demolition Plan

    How many of you regularly provide a structural demolition plan for remodel/addition projects? Is there some project size where you would add one? Does anyone think providing a structural demo plan moves the responsiblity of the contractor onto the engineer?
  2. MillR

    Enercalc Masonry Slenderwall Deflection

    I'm designing masonry slender walls using Enercalc and I always have concerns with what it's doing. The default load combinations for either IBC or ASCE for deflection include W only at 1.0. Which, as far as I can tell, is ultimate wind. Wall deflection should be at allowable levels, if I...
  3. MillR

    Joist Girder to Girder Connection

    I have not done a girder to girder connection with bar joists. Normally the end of a girder is supported by a steel column, and that detail is standardized by SJI. Has anyone done this detail? Do the joists need to be the same depth? Thanks in advance.
  4. MillR

    Induced Seismicity and Structural Design

    USGS has published 1 year seismic hazards for 2016, 2017, and 2018 for the increase in earthquake activity in the central part of the United States (Oklahoma), linked to wastewater from mining. The earthquakes are low magnitude, but do cause damage as the infrastructure is not designed for...
  5. MillR

    Tier 1 Seismic Retrofit Building Type

    Using AISC 41, I am conducting a Tier 1 seismic analysis of an existing hospital building that has previously undergone a seismic retrofit. The original building (1947) used steel moment frames. The retrofit (1981) used concentric braced frames. I am trying to pick the building type for the...
  6. MillR

    Tornados

    I keep thinking I am all grown up and know every kind of engineering, and then the humble gods come around and say: tornadoes. So I've engineered high seismic (CA), high wind (FL), bad soil (CO), every kind of structure but ... nothing in Kansas, as it turns out. And suddenly am in a position...
  7. MillR

    Slab depressions in CJ layout

    While providing a 3rd party QC Review, I am now engaged in a "friendly" argument with the EOR regarding CJ layout. My comment was: "Review the CJ layout and consider treating slab depressions as edges or re-entrant corners and keep spacing around 36t max." It looked to me that the slab...
  8. MillR

    structural analysis software

    I am looking to adopt new structural analysis software for a small structural team primarily doing multistory steel and concrete buildings in a variety of locations in the United States and am looking for suggestions. I am leaning toward RISA or RAM, although it has been a long time since I've...
  9. MillR

    Loud popping noises in residential wood framed construction

    I've done an investigation of a house and have mostly sorted out the structural issues, but the owners are concerned about ongoing extremely loud (they scare the dog) popping sounds that occur pretty continuously all over the house. The house has some foundation problems, has had a foundation...
  10. MillR

    Revit Structural

    How difficult is it to learn Revit Structural? Is a 3-day seminar a good idea? Can it be "picked up" from a book, some knowledge of Revit Architectural, or Autocad knowledge? Any other comments about Revit in general would be appreciated, although did I read through some past links that...
  11. MillR

    How to analyze plywood over SIPS panel

    I have to determine the capacity of a floor that consists of a new layer of 3/4" T&G over an old SIPS panel. The building is being converted from residential to office space and the extra floor live load has to be addressed. The remodel is already done, building red-tagged, and I am now...
  12. MillR

    Driven Pile - Pipe to Cap detailing

    I'm a structural engineer designing a steel pipe pile foundation (as required by the soils report). It's for a small manufactured metal building with a pile cap at each column. Question: Are typical pile-to-cap details more complicated than embeding the pipe 6" into the cap? There are small...

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