ABSTRACT:

This paper details results from nonlinear analyses of the ultimate limit state performance characteristics of four Gulf of Mexico (GOM) platforms subjected to intense loadings from hurricane Andrew. These four platforms were located to the east of the track of hurricane Andrew and were thus in the most intense portion of the storm [Smith, 1993]. The nonlinear analyses are able to replicate details of the observed behavior of the four structures. This replication is very dependent on realistic characterization of the performance characteristics of the pile foundations and on accurate information on the "as is" condition of the platforms before the storm.

INTRODUCTION

As part of a long-term research project, analysis procedures and computer programs are being developed that are intended to allow the engineer to make simplified, yet realistic evaluations of the dynamic, ultimate limit state behavior characteristics of conventional template-type offshore platforms subjected to storm loadings. A companion paper details the second-generation simplified procedures that have been developed to permit evaluations of storm loadings and static - cyclic capacities of such platforms [Bea, Mortazavi, 1995]. The simplified procedures are being verified with results from complex nonlinear static and dynamic analyses that are able to provide details on the performance characteristics of platforms that are loaded to their ultimate limit state [Bea, DesRoches, 1993; Bea, Landeis, Craig, 1992; Bea, Craig, 1993]. This paper describes results from four platforms that have been analyzed as part of this research. These four platforms were located to the east of the track of hurricane Andrew, and were thus in the most intense portion of the storm [Smith, 1993]. The nonlinear analyses are able to replicate details of the observed behavior of the four structures. The remainder of this paper will detail the analyses and results for these four platforms.

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