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S12 Impacto em Estruturas |
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Title:
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RESIDUAL STRENGHT OF SEMI-SUBMERSIBLE PLATFORMS CYLINDRICAL DAMAGED COLUMNS
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Summary :
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WE`VE INVESTIGATED THE ULTIMATE LONGITUDINAL STRENGTH AND POST-COLLAPSE BEHAVIOUR OF DAMAGED COLUMNS, DUE TO IMPACT OF SUPPLY-BOATS. WE“VE RESTRICTED THE SCOPE TO INTERNALLY RING STIFFENED COLUMNS, WITH THE RATIOS RADIUS TO THICKNESS (R/T) AND RING SPACING TO RADIUS (L/R), TYPICAL OF SEMI-SUBMERSIBLE FLOATING UNITS, SUBMITTED TO LONGITUDINAL COMPRESSIVE LOADING. WE“VE CONSIDERED KNOWN THE GEOMETRICAL PARAMETERS OF THE DAMAGE (INDENTATION), SUCH AS MAXIMUM DEPTH AND AFFECTED AREA, AND INTER-RING RESTRICTED. WE“VE PERFORMED THE ELASTO-PLASTIC BUCKLING INVESTIGATION USING AN FINITE ELEMENT NUMERICAL MODEL, CONSIDERING NON-LINEAR GEOMETRIC AND MATERIAL PLASTICITY. WE“VE SIMULATED THE INDENTATION AND THE LONGITUDINAL COMPRESSIVE LOADING BY AN DISPLACEMENT-CONTROLLED SCHEME, TO AVOID NUMERICAL INSTABILITY NEAR THE ULTIMATE LOAD. WE“VE VALIDATED THE NUMERICAL MODEL BY COMPARISON TO PREVIOUS AVAILABLE EXPERIMENTAL RESULTS, AND CARRIED-OUT AN PARAMETRIC STUDY TO INVESTIGATE THE INFLUENCE OF THE FOLLOWING VARIABLES ON THE ULTIMATE STRENGTH OF THE NUMERICAL MODEL: INITIAL IMPERFECTION DISTRIBUTION, DEPTH AND AFFECTED AREA BY INDENTATION, AND THE MAGNITUDE OF THE EXISTING LONGITUDINAL COMPRESSIVE LOADING PRIOR THE DAMAGE.
KEY-WORDS: SHELLS, BUCKLING, COLUMNS.
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Author :
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CYRINO, JŚLIO C. R.
VILAIN, LEONARDO 0
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Paper View :
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