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Technology
Assessment & Research (TA&R) Program
| Project
Number |
246 |
| Date of Summary |
October 31, 2000 |
| Subject |
Reliability-based Reassessment of
Jacket Platforms |
| Performing Activity |
Stanford University |
| Principal Investigator |
C. Allin Cornell and & Dr.
Steven R. Winterstein |
| Contracting Agency |
Minerals Management Service |
| Estimated Completion |
June 2000 |
| Description |
This is a Cooperative
Agreement. The purpose of this project is to develop a modern reliability-based set of
procedures for the evaluation, design and re-assessment of offshore structures. The dual
coupled bases are: (1) state-of-art non-linear structural analysis, and (2) explicit
structural reliability. The objective is to exploit the best tools available to the
industry to insure safe yet economical facilities. |
| Progress |
A large suite of
real records (from one "bin", i.e., very nearly the same magnitude and distance
causative event) was run through a large number of different single and multiple degree of
freedom models of frames, and found the median and standard deviation of response to these
real (untouched) records. The records were 'compatibilized' (using two different
professional, state of art/practice "compatiblizing" programs) to have virtually
the same response spectrum: namely the median response spectrum of all these records. Then
these 'artificial' records were run through all the same models and processed in the same
way. At interesting levels of ductility, (degree of nonlinearity) the artificial records
were good in that they produced much less dispersion (a factor of about 4
less - implying 'cost'; savings of a factor of 16 for comparable accuracy in
prediction of median response). But, they were unconservatively biased: the median predicted
was about 20
percent
too low, at ductilities of 4 or more for virtually every model looked at. |
| Reports |
|
AA |
Carballo, Jorge Eduardo advised
by Cornell, C. Allin ``Probabilistic Seismic Demand Analysis: Spectrum Matching and
Design,'' PhD Thesis and Report RMS-41, July 2000.
Report is copyrighted and cannot be seen. |
| AE |
Grilli,S.T., Fake, T. Spaulding, M.L. "2000
Numerical Modeling of Oil Containment by a Boom/Barrier System: Phase III
Final Report. University of Rhode Island. May 26, 2000 |
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