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  1. KSRAO

    UBC - Basis for Load Combinations

    Could anyone explain how the load combination specifications of UBC 1612 are arrived at and basis for the associated load factors? Also, do the load combinations/factors depend on the construction material? -thanks, Rao.
  2. KSRAO

    Difference between MCE and PGA

    What exactly is the difference between MCE (maximum credible earthquake) and PGA (peak ground acceleration)? It's not clear to me from their definitions. How're their magnitudes determined? Also, why is it that, generally, buildings are designed for PGA (eg. UBC recommneds effective PGA) where...
  3. KSRAO

    Elastic Seismic Design loads on (older) Bridges

    I understand from literature that a very small % (about only 6%) of gravity weight was used in the design of many of the older bridges (even in California) against earthquakes. I was wondering if there's any reason/basis for choosing such a small lateral design forces knowing the importance of...
  4. KSRAO

    Caltrans Seismic Design Criteria & ARS curves

    As many of you may know, in California state, design of standard bridges for seismic loading is done based on "Siesmic Design Criteria (SDC)" developed by CALTRANS. Essentially, the procedure it uses is based on deterministic ARS approach and a set of standard ARS curves to be used to...

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