Abstract
Abstract: Offshore platforms are divided into many types which are mainly categorized according to waterdepth in the installation location. However, the design differs for each type to accomplish the target of the operation. But for some case of sea waterdepths and an aggressive environment such as the North Sea, steel ones are not suitable, so the heaviest type called gravity platform having enormous mass is used. This type of platform has its special requirements and procedures for construction and needs special types of construction materials in order to resist the climate factors applied due to the aggressive environment. The paper carefully illustrates how the principal Environmental loads (wind and wave), current forces, loads from ice and loads from earth-quake for (earth-quake prone zones) are deployed to archive the design and construction of offshore concrete gravity platforms. Two design methods (Analysis and Design of Shell structures) and the Tangent Modulus Methods of design of Offshore Concrete Gravity platforms are discussed
Highlights
Offshore platforms have many uses including oil exploration and production, navigation, ship loading and unloading, and to support bridges and causeways
Offshore substructures have proved to be highly endurance to the harsh marine conditions, this is due to the strength of the reinforced concrete that can be further reinforced on demand to meet the requirements of several sites (Chakrabarti, 2005)
Waves and winds are the two principal environmental loads considered in the design of offshore gravity platforms
Summary
Offshore platforms have many uses including oil exploration and production, navigation, ship loading and unloading, and to support bridges and causeways. Offshore oil production is one of the most visible of these applications and represents a significant challenge to the design engineer. These offshore structures must function safely for design lifetimes of twenty-five years or more and are subject to very harsh marine environments. Offshore substructures have proved to be highly endurance to the harsh marine conditions, this is due to the strength of the reinforced concrete that can be further reinforced on demand to meet the requirements of several sites (Chakrabarti, 2005). Requires significantly high soil standards, Additional labor need for the pre-construction phases, Prolonging the production as it commences after the construction competition. (Chandrasekaran, 2015)
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