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  1. aiden

    A Concrete OMRF in a High Seismic Risk Area?

    A colleague of mine designed a concrete OMRF in a High Seismic Risk area. As ACI code requirement, it should have been a SMRF (this requirement was overlooked, his previous designs were all in very low seismic areas). The designed OMRF structure obviously resulted to a massive structure since...
  2. aiden

    Unbraced length Lu

    i am developing a program for steel design using CISC/CSA16.1-94. It is almost complete except that I could not find any formula to calculate Lu (limiting unbraced length) this is equivalent to "Lp" of AISC 360-05, (Lp values from AISC 360-05 are too conservative). I tried the iteration...
  3. aiden

    Historic shapes pre-1930's

    I am evaluating an existing building in Canada and I encountered steel shapes that I could not find in any available references. not even in 1934 AISC, old CISC handbook etc. the beam shapes are mostly 27I160, 27I145, 27I101, etc. (note that I/S shapes commonly comes up to 24" only, even in...
  4. aiden

    Shielding effect on multi-frame structures

    hi, i am preparing a design specification/criteria for our new project. for shielding effect of multi-frame structures (e.g., a very long piperack), i am looking for a shielding effect formula to be applied. i was away from design work for 8 years. i remember using the shielding effect formula...

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