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  1. strainman

    Landslide

    We are trying to locate the Ultimate Load Factor that is normally used for Landslide load effects in California. Can any one assist.
  2. strainman

    Landslide Load Factor

    Could someone please assist us with the loadfactor that is normally used in California for landslides. This is not a Caltran project but we would feel comfortable using whatever factor they us.
  3. strainman

    In Enercalc Masonry Wall design, what is "Parapet Height"?

    Your wall should be dowelled in at the base and considered a cantilevered wall for design purposes. The cantilever will create a K of 2, so the design height will be twice the actual height. This may be what is controling your design in enercalc.
  4. strainman

    Lateral loads on helical piers

    Think about battering the piles, helical piles can be battered to resisit lateral loads.
  5. strainman

    Uplift Bridging

    Like the way you think structuresguy! The steel joist institiute makes no differentiation in their bridging requirements (sizing) between one joist or a thousand. Which would make one think that accumulation of forces for each member would not be required. But for the additional cost of a few...
  6. strainman

    Problems!

    A good motto for every engineer to live by: "The closer a misstake gets to the end user the more it will cost."
  7. strainman

    Garage Door Failure

    As this doesn't seem to happen often, "my quess" is that if someone looked into it carefully you would probably find that it is a defect in materials or workmanship. In which case they should be responsible to replace the door.
  8. strainman

    Wheel Load Distribution on Road Plate

    The distribution formulas are for two way action.
  9. strainman

    Wheel Load Distribution on Road Plate

    There are formulas in AASHTO. One for point loads and one for uniform loads, that will give you the percentage of load that is carried by each direction. with a: being the short span b: being the long span Point load short span is b^3/(a^3+b^3) Point load long span is a^3/(a^3+b^3)...
  10. strainman

    Web only steel beam?

    MHSpurs The only formular that I have seen for steel plates bent about their strong axis is: Fb=.6 Fy for Ld/t^2 less that 500 Fb= 10,000/(Ld/t^2) ksi for Ld/t^2 over 500 where L is the span inches d is the depth inches t is thickness inches This formular is stated to be for a simply...
  11. strainman

    Unbraced length Lu

    Lc an Lu are stated in feet in the AISC Manual. 12, in/ft; d, in; Af in^2
  12. strainman

    Unbraced length Lu

    Add on to above, the 555 is for ASTM A36 steel only. Lu values very for different grade steels.
  13. strainman

    Unbraced length Lu

    aiden, "Crawley and Dillion Steel Buildings Analysis and Design" state Lu= 545\(12*d/Af), but when I worked this out to check Lu in the AISC 9th Edition Manual the numerator back figures to be closer to 555 than 545. But, this should give you a good starting point. The Lu values are rounded...
  14. strainman

    Code Required Footing Ties

    According to my interpretation of the code, NO.
  15. strainman

    Code Required Footing Ties

    An individual footing would be one that is not attached to any other part of the structure laterally. Examples of individual footing would be a pile cap, or column footing that is too far below the slab to obtain lateral support from the slab. The idea here is to obtain lateral support for the...
  16. strainman

    AASHTO effective span length definition = clr + 1/2 flange width

    AASHTO assumption is that the flange will bend slightly under load increasing the bending in the slab. This is for steel beams only. For stiff supports such as concrete I-beams and boxes the effective span length is the clear span. Hope this helps and good luck on the exam.

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