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  1. Ron247

    Is mill steel sections isotropic or anisotropic?

    In college I learned mill steel was Isotropic, now I see some internet searches say anisotropic. Is it one or the other, or can it be either one depending on the situation?
  2. Ron247

    Discussion: The Miracle Of The Loretto Chapel Staircase Explained

    Heard about this in the 80s while in college. Never saw a picture, nor read an article about it until today. Out of curiosity, I looked on the internet for it. The 2nd website aligns with the story I heard 45 years ago except the guy showed up on a bicycle and not a donkey. The catch...
  3. Ron247

    Does RISA have a support condition for "bearing only"

    Does RISA have a method to model a reaction that is "Bearing only". It would be like roller, but would not be able to prevent separation from the support. I know I can use Roller and scrap results that wind up needing a mechanical connection but would rather model what I have. I have an older...
  4. Ron247

    Teaching Load Paths Used in Structural Engineering Discussion

    Note: this thread may start and stop periodically as I see people’s comments and then see if I have other needs for input. From a prior thread, the topic of Load Paths (LP) came up. I tried to recall when I first heard of them and started practicing tracing them. I arrived at the BS degree...
  5. Ron247

    A Conceptual Modification to the Continuing Education Requirements

    I just got through fulfilling my CEUs for 2025 which made me look back at the entire concept and architecture of the CEU system. The 2 major positives of them are that it keeps all of us up to speed on changes/innovations and it provides a system where we have a needed formal educational process...
  6. Ron247

    Lateral Pressure of Flowable Fill concrete against a basement wall

    I have a situation where a house transitions from a crawl space to a basement. The crawl space area immediately adjacent to the basement wall was not backfilled and the first row of interior piers for the crawl space are very close to the 8'+ drop-off. There has been soil sloughing off over...
  7. Ron247

    Bridge Ovhg Bracket question about hanger rod connection location.

    I have had several instances where I reduced the spacing for an overhang bracket because my hand calcs showed the controlling stress to occur in the cantilever of the horizontal arm from where the hanger rod connects and the joint of the horizontal to the vertical. The problem is that the...
  8. Ron247

    Are there SYP 3/4" tongue and groove floor deck design values other than NDS by the AWC

    I have an 100 yr old house that only has 1 layer of 3/4" T&G flooring. There is no Sub-Flooring. They are wanting to sand it again but I cautioned them about losing strength due to repeated sanding. Are there special design values for 1" or less SYP or does everyone use the NDS for a design...
  9. Ron247

    Beam Stability Factor (CL) and Rb, lu, and le when material is laid flat.

    It has been a while since I did a beam laid flat. If your beam is a 2x6 or 2x8 laid flat, is there any need to calculate Rb, le, and lu since they go into the CL equation but CL=1 if you lay the material flat?
  10. Ron247

    When did the SBC begin requiring a crawl space vapor barrier?

    Does anyone have a general idea about what year the Standard Building Code (SBC) began requiring a vapor barrier/retarded in a crawl space?
  11. Ron247

    Brick Fireplace with 4-sides open

    I have a friend who wants a 25' tall brick fireplace with 4 sides open on the lower 4'. The corners have 8x8 masonry columns about 4' tall. Other than that, the remainder of a 6'-6" x 4'-8" plan view all-brick fireplace is open for the 4' height. Above the 4', it is all brick. I have never...
  12. Ron247

    Using a Statewide Soil Map in Lieu of a Site Specific Soil Test

    I keep running into People/Client's with the idea of using an existing Statewide Soil Map for either design or forensics at a specific site rather than paying for a site specific soil test. I have tried to explain to them that these maps are somewhat accurate over a very large area such as a...
  13. Ron247

    Passive soil bearing notations

    When specifying an allowed passive soil bearing, I generally see it cited as pounds per square foot per foot of depth or psf/ft. I occasionally see it presented as pounds per cubic foot (pcf) but this seems incorrect even thought the units will simplify to this. Doe this matter? Also, when...
  14. Ron247

    Nailing into the 1.5" wide face of a stud

    Does the NDS have any load provisions for using a dowel type fastener (nail, lag screw etc.) into the 1.5" wide face of a typical 2x4 stud? If so, what section is it in? I do not see any mention of edge distance. We have a situation where we have to put multiple lags into a wall stud...
  15. Ron247

    What magnitude of minor lateral force on Great Room wall makes it shake

    I was pushing laterally on a 20'Hx25'W Great Room wall the other day to show the builder how weak the wall was. With only me pushing on the wall at about 4' to 4.5' from the floor, you could easily see it moving in and out. The wall is almost all windows and doors. It was framed with 2x4 syp...
  16. Ron247

    Need Info on moisture trapped in roof systems due to insulation.

    I am looking for information or articles about moisture that gets trapped in roof systems due to insulation causing problems. Examples would be a shallow parallel chord wood truss roof with un-vented insulation under the trusses. I have seen pictures of wood rot and rust on nails due to...
  17. Ron247

    What does "MMA" and "MSA" generally stand for?

    I have seen these 2 abbreviations on Electrical drawings several times but have not seen what they stand for noted in a legend or abbreviations table. I am assuming they are so obvious in the Electrical world they may not need to be stated, but I am structural. I also see UGPS stated and not...
  18. Ron247

    Need a reference for watts/sf usage for different business types

    Does anyone have a good source of estimated energy usage in watts/sf for different types of buildings? The most common ones we attempt to estimate are: medical office buildings 1-story Office buildings multi-story office buildings Apartments (generally multi-story) Mixed use high-rise such as...
  19. Ron247

    3-Second Gust, Maximum Sustained Wind Speed Definitions.

    I am trying to bridge the gap between structural design wind terminology and weather terminology. I am not sure if they use the same terms differently. I have asked many others in both engineering and weather but seem to get conflicting definitions. In structural design, we use a 3-second...
  20. Ron247

    Wood Pile Base Reactions When Forced Out of Plumb

    For purposes of this general question, lets assume I have a building on 10' tall wood piles that were originally plumb. Even when the building was built on the piles, the beams were centered on the plumb piles. Due to this impossible ability to have no initial eccentricity, there should not be...

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