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  1. vmirat80

    Steel deck moment formula

    The Vulcraft catalog for steel deck has two negative moment formulas. If the length is less than or equal to 10 feet, the formula is 1/12WL^2. If the length is more than 10 feet, the formula is 1/10WL^2. I understand the 1/10 factor is for a three-span condition. It also seems that they are...
  2. vmirat80

    Green Book turning templates

    It is my understanding that the turning templates in the AASHTO Green Book assume that the vehicle is starting the turn with it's wheels already turned to max angle. This doesn't seem to be a realistic condition. The turning path of the vehicle will be affected by the time it takes the driver...
  3. vmirat80

    Steel Manual: kdes vs kdet

    Looking at a W10x30 in the steel manual. It has k for design at 0.810 inches. The k for detailing is 1-1/8 inches. That's nearly a 3/16 inch difference. I can understand design and detailing being different, but not that much. Why such a large difference?
  4. vmirat80

    Reinforced concrete encased duct bank

    DoD does this all the time, but we don't reinforce the concrete. Sometimes we just use flowable fill instead of full-strength concrete. The encasement is just to prevent a backhoe from damaging the conduits. I think the electrical engineer is over-designing, unless there are poor soil...
  5. vmirat80

    Coring Elevated Concrete Floor Deck

    KootK, thanks for the docs, very helpful! Unfortunately, they still leave a lot to be figured out. - If there are four 4-inch holes running perpendicular to the deck flutes, how far apart can they be from each other so that they don't count as one big opening? My guess, based on their rules of...
  6. vmirat80

    Coring Elevated Concrete Floor Deck

    Contractor wants to drill 4-inch diameter holes through a second floor concrete/metal pan deck for conduit. Deck span between floor beams is about 8 feet. At what point do these holes compromise the strength of the deck?
  7. vmirat80

    Life as a Structural Engineer

    Just to offer a different career path. I've worked for DoD for 40 years, specifically the Air Force as a GS-12 in the Civil Engineering squadron. I've designed and project managed all sorts of projects, from new buildings to new roads and repairs to said structures. Someone in college should...

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