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Project Number 101
Date of Summary November 01, 1999
Subject Residual Strength of Offshore Structures After Damage
Performing Activity Lehigh University
Principal Investigator Dr. Alexis Ostapenko
Contracting Agency Minerals Management Service
Completion January 2000
Description This was a Joint Industry Project (JIP). This project covered three areas of concern involving damaged structures: the effect of corrosion damage on strength; field assessment of corrosion damaged; and the repair of dented tubular columns.
Progress Completed. Work focused on the effect of multiple corrosion patches and column length on the strength of tubular columns. Finite element (FE) analysis was used to study the interaction between corrosion patches. This work continued the research that considered the effect of a single corrosion patch.

A M.S. Thesis has been completed which covers the major segments of this part of the project. The thesis was entitled "Ultimate Strength of Tubular Columns with Multiple Corrosion Patch Damage" by Onur Gulec. The following area of work will be added, reworked or expanded on in the final report as compared with that presented in the thesis: (1) A full description of the tests and the actual work performed by others (2) An improvement of the accuracy and a simplification of the strength formulas for tubes with three corrosion patches (3) Completion of the development of strength formulas for tubes with two corrosion patches (4) Extension of the FORTRAN computer program to allow for two and three corrosion patches (5) Additional cases analyzed by FEM to expand the data base needed in the process of formulating approximation formulas for design.

Reports
AD Ostapenko, A., Padula, J. A., Indentation and Axial Tests of Two Large-Diameter Tubular Columns, Fritz Engineering Laboratory Report No. 508.5, Lehigh University, Bethlehem, Pennsylvania, Final Report, February 1987.
AG Padula, J. A., Ostapenko, A., Indentation Behavior of Tubular Members, Fritz Engineering Laboratory, Report No. 5088, Lehigh University, Bethlehem, Pennsylvania, Final Report, June 1988.
AO Ostapenko, A., Berger, T.W., Chamber, S.L., Hebor, M.F., Corrosion Damage -- Effect on Strength Tubular Columns with Patch Corrosion, ATLSS Report No. 96-01, Lehigh University, Bethlehem, Pennsylvania, August 1996.
AP Ostapenko, A., Berger, T.W., Moment-Thrust-Curvature Relationship of Grout-Filled Dented Tubes, ATLSS Report No. 96-02, Lehigh University, Bethlehem, Pennsylvania, August 1996.
AS Ricles, J.M., Bruin, W.M., Sooi, T.K. Repair of Dented Tubular Columns - Whole Column Approach, ATLSS Report No. 97-13, Lehigh University, Bethlehem, Pennsylvania, December 1997.

 

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