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Recent content by lkjh345

  1. lkjh345

    Fire Truck loading using AASHTO LRFD

    Excellent Post SteelPE. We have found this outrigger criteria to be the controling load case in some instances as well. Like you, we found this in the Denver Building Code, but choose to apply it to conditions where a fire truck could be on top of our structure in other cities/states.
  2. lkjh345

    Damaged PT Slab

    Good advice there southard2!
  3. lkjh345

    Grade beam modifications

    If the notch absolutely has to be cut into the top of the grade beam (and I would exhaust all possibilities to check if there is another solution), it is possible to dowel on a 'sister' beam to the side of the orginal beam to reinforce the exsting beam and carry load through the area where the...
  4. lkjh345

    Designing a Data Center

    If the cables are run overhead, be very generous on the load you assign to the cable trays in your design. A few data centers that I work with, when they are cahnging configuration of the equipment, do not remove the old cables if they are on the bottom of the tray. They simply abondon these...
  5. lkjh345

    Concrete on Metal Decking dead Load Question

    A Vulcraft metal deck catalog has weights for various decks sizes and concrete fill combinations. Assuming 1 1/2" composite metal deck with 2 1/2" normal weight concrete fill (4" total), the catalog gives a dead load of 39 psf.
  6. lkjh345

    Floor Load for "heavy" filing cabinets

    Yes, locating the cabinets over a beam will help. Will it help enough???? Is it worth the risk to you that its not enough. If you guess that it will be OK, and you are wrong, are you willing to accept the resposibility for your mistake? Still think its best to get a structural engineer...
  7. lkjh345

    Turkish Building Demolition

    Given that no one got hurt, that is an awesome video! That building was built to last!
  8. lkjh345

    loads for temporary aircraft hangars

    I would still design for the 50 year loads. There is a 2% chance of the 50 year event happening in any given year. During a life span of 20 to 25 years, that is approaching 50% chance of the event occurring. I would not want to tell the owner after something happened, 'Well, it did have a 50%...
  9. lkjh345

    Floor Load for "heavy" filing cabinets

    I third csd72. Fire resistant cabinets will be close to 400 to 500 kg each when loaded. ( The fire resistant file cabinets themselves are very heavy. ) Grouping 6 to 8 of them in a small area is definately something a structural engineer should look at. The localized loading will be way above...
  10. lkjh345

    Wood touching insulated concrete - pressure treated or not?

    If you select wood treated with borate or ACQ, make sure you properly specify the coating for any metal fasteners in contact with the wood. These new wood treatments corrode metal much faster than the old treatments.
  11. lkjh345

    Mechanical Screen Design

    Might check with your architect and see if you can use the 'open mesh' type of screen for the walls. Some of these have an effective wind area of about 1/2 of a solid material. It helps. Otherwise, yes screen wall verticals get pretty big. Connection to the roof structure can be a challenge as...
  12. lkjh345

    Cold Storage Design

    I would seriously consider removing the existing slab, putting 4" of rigid insulation down, and casting a new slab for the cold storage portion of the building. As spats points out, normally, the insulated walls are connected to the underslab insulation. Also, it is unlikely that the vapor...
  13. lkjh345

    Vibration and cracks in the building

    I can believe the grading operation is casuing the building to vibrate. A fairly well know case locally is of a hotel's laundry extractor (squeezes the water out of the laundry before it goes to a dryer) vibrating the entire 20 story hotel so bad people could not sleep if they ran it at night...
  14. lkjh345

    When to NOT Use Composite Steel

    abusementpark: Yes, 1,000 studs is a good round number to consider when deciding on whether or use composite steel or not. I have had converstations with one of the owners of a local steel erection company (who also used to be a practicing structural engineer) and its his opinion, through...
  15. lkjh345

    Brick Arch

    Hopefully concretemasonry is watching the board this week. He is extremely knowledgable about these matters.
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