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Recent content by MultiVar

  1. MultiVar

    Wind interference effect due to adjacent buildings

    TURBULENCE is the word/concept everyone's toeing up to. Also Venturi Effect. While not trivial to model turbulence, there's never been a time with so many proven mature tools, most good enough to avoid having to build physical wind-tunnel models. Will this be a steel-framed or concrete...
  2. MultiVar

    Full scale reproduction WWII fighter aircraft utilizing carbon fibre composites?

    Actually, the Swiss have already certificated and put into line production the aircraft that you are proposing... it's called the Pilatus PC-21... I'll take TWO! [thumbsup2][pipe]
  3. MultiVar

    Removing the insides of an existing structure +underground car parking

    Though only peripherally involved in the Civ. Eng. field, I can see this is a JUICY project, on several levels--no pun intended. 1) The budget is the moon, or higher, lol. 2) High-profile project, and your firm's name is on the construction fence (and in local newspapers) for a long time. 3)...
  4. MultiVar

    Epoxy anchor bolt testing

    The Deflection Temperature of some anchoring epoxies is low enough to be a real concern, especially when you consider installations in sun-exposed Sun Belt locales, greenhouse effect in glass-walled stairwells, utility tunnels carrying steam pipes, etc. Not to indict any particular mfr...
  5. MultiVar

    Expansion Anchor Connection to Concrete Wall

    Why not use galvanized steel plate for the spacers? Coastal S. FL is the most aggressive (in terms of CORROSION) environment in CONUS, i.e. combo of high temps, high humidity, and salt spray. Exposed galvanized doesn't do well; neither do most stainless alloys for that matter. For the ledger...
  6. MultiVar

    Expansion Anchor Connection to Concrete Wall

    ... I would recommend using spacers (say 1/2" x 3" PT plywood strip vertically) at your bolts to provide an air space between the concrete and the wood. Helps to minimize the trapped moisture that will ultimately rot the ledger. Wow, this whole thread is 5-star suggestions, incl. this one...
  7. MultiVar

    PERSPECTIVE NEEDED.

    Holy Crikey, a CMU shear wall 25' tall and 10' in the shear plane? Sounds whacked. I have just HAVE to model THAT! Could the OP please (on an empty stomach), talk to the GSA jackass, and obtain the proposed "expert" construction of said walls, i.e. number, size, spacing of bond beams...
  8. MultiVar

    Air entrainment

    All's well that core-tests well. Happy New Year... hope you get paid on time. ;') Seems commons sense that test cylinders should be cured exactly as the pour is, yes/no? But I've been on sites where the test tech is putting the samples away in the construction trailer, or the crew cab of his...
  9. MultiVar

    Stress Engineer from US moving to Alberta - How's the work situation?

    As of 2006, less than 1/3 of the people in Canada who had engineering degrees worked in the engineering field. OUCH... is that 2 yellow flags, or 1 large RED flag? Love to see the breakdown, details, etc. I HAVE been lucky enough to meet a stunning woman who any man would gladly marry and...
  10. MultiVar

    Air entrainment

    SO... does this mean his water tank has to be demolished and re-poured, the mix supplier penalized, etc.?? We CAD geeks are stuck in the lab, wondering what happens when the numbers don't add up in the field...?
  11. MultiVar

    Effect of heat on concrete strength

    Curious noob needs learnin': What type of anchor, exactly? CIP L-bolt? Post-installed expansion/wedge/bolt...?
  12. MultiVar

    Stress Engineer from US moving to Alberta - How's the work situation?

    1) I'm assuming you're a US Citizen, so even post-NAFTA, I believe there are still several LEGAL HOOPS both you and your prospective employer will have to jump through... think green card... think H-1B visa. Canada has parallels, and is historically more "protectionist". How likely is it that...
  13. MultiVar

    Lintel for openings at curved CMU wall

    I normally would suspend it with rod hangers from the structure above; this way you can reduce almost to nil the torsional effects, and problems at supports. Sweet idea. I have to model structs like this, typically with more pronounced (out of plane) curvatures. So do you mean shore up...
  14. MultiVar

    Steel lintel

    The answer is a formula, for any arbitrary length, not a value. Possibly a simple linear formula, or at most a catenary?... not sure since I'm not in the field, and not clear what the "angle" in question looks like, and behaves like. Extruded? Cold formed? Any pics or data book links? Maybe I...
  15. MultiVar

    Suitable concrete decking for 2-axis cantilever?

    In my view these things better be tied all together, since the main weakness of the prefab things is the one that made the old buildings fail: lack of continuity. The generalization of the redundancy brough by the placement of gluing concrete anywhere is maybe the biggest apport to structural...
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