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Recent content by KSRAO

  1. KSRAO

    P/S Bridge Girders in CONSPAN

    May be too late response for this particular question. But thought will be helpful for future reference. Debonding can be done in the middle too. Not necessarily at the beam ends. Also, CONSPAN does allow debonding both the at ends as well as in the middle of the girders. PCI manual is of a...
  2. 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.
  3. KSRAO

    Elastic Seismic Design loads on (older) Bridges

    Hi Mike, thanks for our response. In the references you mentioned, I could only find different approaches discussed separately. There is no talk of QUANTITATIVE DIFFERENCES among different approaches. Let me try on the net as you suggested (is there any specific site you have to suggest?)...
  4. 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...
  5. KSRAO

    Elastic Seismic Design loads on (older) Bridges

    Thanks QSHAKE. I've two more related questions. (1) Was it the case with the design of building structures too? I mean, older bldg. structures were also designed for smaller % of their gravity loads? (2) Theoretically speaking, can we take advantage of the presence of high degree of redundancy...
  6. 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...
  7. KSRAO

    Caltrans Seismic Design Criteria & ARS curves

    koodi, thanks for your response. As you rightly said, yes, ARS value depends on EQ magnitude, PGA and soil profile type (A/B/C/D/E or F). And hence there are different sets of ARS curves corresponding to different soil profiles. But my question was: why is there a mention of soil type B in...
  8. KSRAO

    Storage Rack Design

    If it's in the USA, the governing design specification/standard is :SPECIFICATION FOR THE DESIGN, TESTING AND UTILIZATION OF INDUSTRIAL STEEL STORAGE RACKS (Latest edition:1997)". It's developed by the RMI (Rack Manufacturers Institute, Inc. You can also visit the following web site for...
  9. 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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