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Recent content by daski

  1. daski

    ASCE 7-10 Load Combinations

    I concur with JAE and RPMG although I'm not sure what the W/1.5 represents. The concrete reinforcing should be designed to the Strength (LRFD) load combos. Allowable strength design of concrete is not done anymore. It was in ACI 318-95 as Appendix A, but was subsequently removed from ACI 318 in...
  2. daski

    Concrete Floor Slab with compression loading

    That is correct.
  3. daski

    Concrete Floor Slab with compression loading

    I have a project with 5 levels of below-grade floors, therefore those floor slabs are also under lateral compression loads due to the soil pressure on the basement walls. It is all CIP concrete. Some floors will be 2-way flat slabs others will be one-way with beams. Is there a preferred method...
  4. daski

    Elevator machine room Structural Slab

    I just spoke with a rep from Thyssen-Krupp. He said I could use metal decking--there's no specific need for a flat soffit. It will probably need to be shored up in any event. I do have elevator seperator beams at every floor for rail attachment. He said the steel beams used to support the slab...
  5. daski

    Elevator machine room Structural Slab

    I'm faced with a new (to me) concept. Designing a 'structural slab' for support of traction elevator machinery as opposed to using steel machine beams. I have a steel-framed building and an elevator bank of 6 shafts (3x2 back-to-back). Do I just need to design a thick concrete slab spanning to...
  6. daski

    Molten Sulpher

    I just came across a detail on drawings circa 1970, North Carolina. For attaching a metal guardrail post to a concrete slab, the note on the drawings pointed to a cast-in-place metal pocket and said "set post in molten sulpher." (I would normally say, "set in grout".) Does anyone know what this...
  7. daski

    PRECAST WALL AND ROOF

    I don't design precast for a living, but what i've seen from checking shop drawings is that most of the prestress is in the stems of the tees, towards the bottom. There are also prestress strands in the deck portion, spaced at 2 or 2 1/2 foot or so. The mild reinforcing in the deck portion is...
  8. daski

    Parking Garage Vehical Guardrail

    Snow plows would only be a problem on the top floor. If the garage is built of concrete, the spandrel beam can be upturned up a couple feet and act as the car barrier. You can then put a few barrier cables above that to attain the 42" required height. If you just use barrier cables from ground...
  9. daski

    Deflections

    for spandrel beams supporting curtainwall, i try to keep live load delflection to 0.375" or less. mdaskilewicz@cuh2a.com
  10. daski

    Looking for Old Steel Channel Properties - Please Help

    there's no such channel or miscellaneous channel in the Seventh Edition either. Maybe its a typo. Try emailing the question to AISC on their website. http://www.aisc.org/Template.cfm?Section=HOME&Template=/CustomSource/SteelSolution/SolutionCenterContactForm.cfm mdaskilewicz@cuh2a.com
  11. daski

    Raychord joists

    Does anyone have any info on Raychord open-web steel joists? Circa 1960's mdaskilewicz@cuh2a.com
  12. daski

    Raychord Joists

    Does anyone have info on Raychord open-web steel joists? The top and bottom chords are cold-rolled gage metal channels and the web is a continuous gage metal angle. I believe they are circa 1960's. mdaskilewicz@cuh2a.com
  13. daski

    Carport loading

    I don't know where you live, but in most parts of the US, the main "live load" on a roof is snow and snow drifting. If you don't get snow, is it possible for rain water to accumulate on the roof due to clogged drainpipes? Otherwise, just use the code live load (12 psf as you say)...
  14. daski

    the reason for.

    The large size aggregate creates large size void spaces. These large spaces provide a "capillary break", thus preventing water from being sucked up to the underside of the slab by capillary action. Capillary action is the phenomenon of water travelling through tiny spaces without the...
  15. daski

    a flat roof.

    A roof with vaulted ceiling is not something you want designed in a chat room. Even scissor trusses cause outward thrust on the walls. Spend the money and hire a registered structural engineer to do the design and (especially) the details. Make sure he/she is experienced in wood...
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