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  1. river55

    PE vs SE The New Exam Structure

    Yes, this October is the last time that the SE III exam will be given in Washington. The whole country will move to the NCEES 16 hour exam after that. The only reason to take the SE III exam would be if you have already passed the SE1 and SE2 exams and needed the SEIII to get your SE liscense...
  2. river55

    Foundation Rocking - How to determine if it will occur

    I guess my question on the rocking is if there is a way to determine if it isn't going to occur. If you set an R = 1.0 for instance (which is like the force from ASCE 41), are those the 'real' seismic forces that the frame/shearwall will be exposed to? Obviously, if you did a dynamic analysis...
  3. river55

    Foundation Rocking - How to determine if it will occur

    Rocking is something that gets involved in the more intensive seismic analysis, especially non-linear analysis (which I am not qualified to perform). For instance, in ASCE 41-06, on page 88, there is a heading titled "Consideration of Foundation Rocking," and they give some references for the...
  4. river55

    Nailing Plywood Diaphragms

    Most people on the west coast specify a minimum diameter of nail that matches what they used in their calculation. Most calculations are based on common wire nails, so specify that diameter or common wire nails. How the contractor does the construction should be their decision, and I think...
  5. river55

    Foundation Rocking - How to determine if it will occur

    Mostly it would be that I am worried if the foundation rocks what would happen to the structure. Its not that the normal way that foundation systems are designed lead to unsafe structures (they don't), its more to do with if the seismic separation is big enough.
  6. river55

    Foundation Rocking - How to determine if it will occur

    Yeah, "rocking" would be where the concrete shearwall or braced frame basically rocks like a rocking chair and disipates energy. It basically gets confused because with the building code you reduce your seismic loads by an R factor, and then you design your foundations for the reactions based...
  7. river55

    Foundation Rocking - How to determine if it will occur

    In seismic zones, how do you determine if a concrete shearwall or a steel braced frame will rock or not? Does anybody have a reference for how to determine this effect?
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