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  • Users: AELLC
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  1. AELLC

    How does program calculate member deflections?

    I don't have RISA3D, but how do typical 2D or 3D frame analyzers determine member deflections (displacement), at every 1/50 member length or what? I know they calculate each node displacement and rotation by the basic stiffness or flexibility matrices, but does it then use slope-deflection to...
  2. AELLC

    Watermark on printed sheet?

    Does Excel have that capability? Or is there an add-on I could pay for, do that? The definition of a structural engineer: overdesign by a factor of 1.999, instead of the usual 2.
  3. AELLC

    Conc Load > allowed for uniform thickness (California) Post Tension Slab on Grade

    If the conc (column) load is 12K, and the pt sog can take 11K, do we design the footing under the pt sog "very" conservatively for the entire 12K, or what? The footing would then look "large" according to the former, because frequently the brg allow for pt sog is only 1200 psf or so. The...
  4. AELLC

    Golden Gate Bridge

    http://www.youtube.com/watch?feature=player_embedded&v=-jgW0KnWUMQ The definition of a structural engineer: overdesign by a factor of 1.999, instead of the usual 2.
  5. AELLC

    Struct EOR for Pottery House by FLW

    Anyone, by any chance, recall this one? Who was the Struct EOR? http://www.flw-potteryhouse.com/index.php?option=com_content&view=article&id=47&Itemid=53 The definition of a structural engineer: overdesign by a factor of 1.999, instead of the usual 2.
  6. AELLC

    Hyatt Regency disaster - 1981, Kansas City

    Example of PAY ATTENTION to basic statics - just wanted to bring this to attention of younger engineers. http://en.wikipedia.org/wiki/Hyatt_Regency_walkway_collapse I believe the engineer who first specified the original detail (which did seem to be safe) neglected to realize that it was...
  7. AELLC

    Insufficient detailing?

    I don't get it - (see attached) This is high-end spec home- the floor is basically at 3 different levels because it is on a hillside - the floor slab is mostly California-style, uniform thickness post tension, and a little 4" conventional here and there. Of course, the exterior grade varies...
  8. AELLC

    "Search" with a computer having two storage drives

    I have new computer. There are 2 drives, primary one being SSD and the secondary being the usual magnetic disk. When I "search programs and files" , only those located in the primary seem to turn up. How to fix?
  9. AELLC

    Sequence of truss shop dwg submittal

    Normally in this county, the Bldg Dept's do not require the Structural EOR to approve wood truss calculations for house construction. But for some strange reason, the representative for a spec home approaches me with all the truss calculations for approval, saying that even though the house...
  10. AELLC

    Application of loads to wood truss

    See attached girder truss. The psf loads in the lower right corner (TC LL=20 psf, TC DL=14 psf, etc,) are all proper and tidy - however, look at Special Loads in the upper left hand corner - where I have red arrows - and then look at the drawing, at the bottom chord on the right, where I have...
  11. AELLC

    Accidental eccentricty in design of wood posts or load-brg studs?

    I saw this as a footnote in some Glulam Column (GLC) load tables - is the actually a reqd Code item? They had it as 1/6 post dimension, check for x-x and y-y direction, whichever governs.
  12. AELLC

    Calculating the deflection of a wood truss

    I don't have truss or 2D frame software - if I assume the Moment Area of Inertia based on the cross section of the top and bottom chords, as if they were connected with solid web that had no deflection resistance by itself, i.e. solving it as a simple beam, is that ballpark or will give a...
  13. AELLC

    Need E - value for 2x8 SYP M23

    Please, I need this urgently for a meeting with a prefab wood truss mfr. I need to calculate a girder truss deflection by hand today to verify the truss software output.
  14. AELLC

    Sagging prefab wood Girder Truss on custom home under construction

    I am the EOR for said house. When the concrete roof tile was stacked on, a girder sagged badly, probably big mistake by truss co. They sent me a repair method for my approval, but to me it looks bogus. This just happened late today, and I will study it more closely tomorrow. My question- who...
  15. AELLC

    AutoSave with Excel

    without getting into the embarrassing nitty-gritty of why I lose certain versions of my Excel work, overwriting files, etc., is it possible for AutoSave to: 1) While I am working on Excel, using the main drive of my puter (:C), is it possible for AutoSave to save every 15 minutes ONLY to a...
  16. AELLC

    Conditional Formatting for cells that have a formula, then are overwritten manually.

    Is it possible to set it up so the cell color changes when I manually type a number into a cell that has a formula, i.e., deliberately replacing the formula with the desired number? I like to provide a sort of "manual override" in my design workbooks, and wanted to see at a glance which cells...
  17. AELLC

    Need help with Boolean logic on a data list

    I am not normally this troubled, but this has been baffling me for 3 days. See attached xlsx file.
  18. AELLC

    Collecting a fee

    I am a one-man shop specializing in structure design for tract and custom home builders, and a small custom home project I invoiced almost a year ago is still not paid ($1200)...the invoice was to the General Contractor for the house construction. What would be a good next step, to notify my...
  19. AELLC

    OFFSET vs INDEX

    I use both functions a lot, I get correct results, however I don't understand the reason(s) for using one compared to the other. Any insights?
  20. AELLC

    Weight of Ceramic Floor Tile

    I am coming up with 3.6 psf, not including mortar setting bed. (1/4" thick) Does that seem correct?

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