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Recent content by fepc

  1. fepc

    Robertson Steel Floor Deck

    Does anyone have information on Robertson steel floor deck QL 21-20 I need the properties and load tables for 3" deck with a total slab thickness of 6".
  2. fepc

    Masonry Wall Opening

    If there is only 4 feet of wall above the openings one solution is to shore the roof or floor above and remove the wall above the openings. Then install a new lintel and wall above. Remove the shoring after the new lintel and masonry has cured. A second solution is to use needle beams to...
  3. fepc

    Bracing Masonry Walls from Z Purlins

    csd72 Thanks for your response. I am sure this is not a new problem and must have been solved before as there are a lot of metal buildings constructed.
  4. fepc

    Bracing Masonry Walls from Z Purlins

    jike' I have details just like you describe which allow for vertical movement, however what happens when there is thermal movement in the purlins perpindicular to the wall? If the purlins expand and contract with temperature they will put a force into the wall.If the building is long and the...
  5. fepc

    Bracing Masonry Walls from Z Purlins

    I have a masonry wall which extends to the SSR deck and is perpindicular to the Z purlin. The wall requires lateral bracing. How would you brace the wall and still allow the purlin to move with temperature changes and not put stress on the wall? Vertical movement is allowed by having a 1 inch...
  6. fepc

    Help-Garage Slab

    jjeng2 I read the IBC the same way. You may use either one. I assume you have more than one span so use continuity and reinforce the slab over the support. Other wise you will get cracks in the slab. The other choice is to use the steel deck as a form and use reinforcing in top and bottom of the...
  7. fepc

    Tension rod sag

    Kl/r less than 300 does not apply to rods in tension. See AISC ASD Section B7 page 5-37.
  8. fepc

    Concrete Reinforcing Guidelines

    Contact a structural engineer in your area for the design. There are a lot of issues to deal with including thickness of deck, span, loads, support structure, etc. Also there is a liability concern. Do it right. You will sleep better at night. fepc
  9. fepc

    Cold Joint

    AUCE98 Your proposed solution should work. However, I agree with SlideRuleEra. Notify the contractor that replacing the footing may be his cheapest solution as the cost of the engineering plus the repairs may be more. Also what about a fee for your time in evaluating a proposed solution? Good...
  10. fepc

    Help on initial and final set times

    Look at "Design and Control of Concrete Mixtures" by PCA. It depends on temperature, design mix , etc.
  11. fepc

    Concrete for grout

    ASTM C 1019 requires the mold for the grout cubes to be made from the masonry units with which the grout will be in contact. These units will absorb some of the water in the grout which simulates the grout in the masonry wall. You will get higher strengths which are more accurate indications of...
  12. fepc

    Concrete for grout

    If you have horizontal and vertical reinforcing in the walls you will have a good probability of getting voids if the grout has a coarse aggregate. I always use a fine grout in that situation. Also a super plasticizer will give the fluidity required, but it costs more money than water. It does...
  13. fepc

    Uplift Pressures Tank Base

    waytsh, The upward soil pressure is in place prior to the hydrostatic pressure being applied. As the water table rises the pressure on the foundation slab is increased. I would use the full load factors as indicated in ACI 318-02 p.9.2.
  14. fepc

    Uplift Pressures Tank Base

    waytsh Please clarify.Is the hydrostatic pressure from water in the tank or is it from the ground under the foundation? In my opinion the load factor should be applied and there are two loading conditions. Dead Load and Dead Load plus Fluid Load.
  15. fepc

    slab on grade

    erixen What is the thickness of the slab? Do you have any existing drawings? If not I recommend coring the slab in three locations to determine the thickness and then breaking the cores to determine the existing concrete strength. This can be done by a testing lab. After this information is...
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