Many innovative floating offshore structures have been proposed for cost effectiveness of oil and gas exploration and production in water depths exceeding one thousand meters in recent years. One such type of platform is the offshore floating Spar platform. The Spar platform is modelled as a rigid body with six degrees-of-freedom, connected to the sea floor by multicomponent catenary mooring li...

This paper introduces a series of 6 additional papers in this issue that describe an in-depth analysis of options for decommissioning oil and gas platforms offshore southern California. Although current leases require lessees in both state and federal waters to completely remove all production facilities and restore the seafloor to its pre-platform condition, other options have emerged since th...

The time histories of stochastic ocean wave-related processes are simulated by means of computatlonally efficient parametric models The parametric models utdlzed here include the autoregresslve and moving averages (ARMA) algorithms for the simulation of wave height fluctuations, discrete convolution models for linear transformations of given time histories, discrete differentlatmn models for ob...

Inflatable plstic splints have been in use for some time in the United States for the emergency splinting of fracures;t are also gaining popularity in casualty departmentsand clinics in the United Kingdom. Splints of this type cost essentially of a double-walled trAhsparent plastic jacket with a slide fastener and a screw valve in the outer _wa for tion (Pig,,1). The jacket is placed on the lim...

A comprehensive investigation of the directional bending performance a 4-leg jacket substructure, supporting 3 MW offshore wind turbine, has been carried out in this study. The substructure with Pratt bracing system which is already installed southwest farm South Korea chosen as reference support structure. numerical model 3MW structure (i.e., tower, transition piece, and structure) configured,...

This paper describes a normative system design that incorporates diagnosis, dynamic evolution, decision making; and information gathering. A single influence diagram demonstrates the design's coherence, yet each activity is more effectively modeled and evaluated separately. Application to offshore oil platforms illustrates the design. For this application, the normative system is embedded in a ...

In this paper effect of pile-soil consideration in obtaining seismic response offshore structure is assessed due to earthquake loading. InducedSeismic force is one of the most important excitations for the dynamic response of an offshore structure. According to API, Seismic forces should be accounted in platform design for seismically active regions in order to determine the allowable seismic r...

Marine industry requires continued development of new technologies in order to produce oil. An essential requirement in design is to be able to compare experimental data from prototype structures with predicted information from a corresponding analytical finite element model. In this study, structural model updating may be defined as the fit of an existing analytical model in the light of measu...