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• W2078378045 abstract "ABSTRACT Fatigue is an important consideration for deep water platforms in hostile environments such as the North Sea and the Tasman Sea. This paper evaluates the implications of the fatigue criteria on platform design using recent experiences with the Maui Platform A offshore New Zealand. It underlines the importance of realistic fatigue criteria and examines various methods for analysis. The need for estimating appropriate stress concentration factors is illustrated. The impact of fatigue on the weight and cost of the platform is discussed. INTRODUCTION Offshore structures installed in the hostile North Sea can be subjected to fatigue loading far exceeding that experienced in the Gulf of Mexico. The China Sea and offshore Australia and New Zealand are examples of other areas imposing a fatigue premium. Several papers have dealt with various elements of the analysis and design for fatigue with attention focused on estimating the stress concentration factors at the nodes of frame structures. This paper evaluates the significant elements of fatigue design using recent experiences with the Maui Platform A, installed offshore New Zealand. It evaluates the importance of realistic fatigue criteria and examines various methods for analysis. A comparison of stress concentration factors determined with several proposed equations and a finite element analysis is presented. The weight and cost implications are discussed. MAUl PLATFORM A The Maui Platform A, Fig. 1, presently being installed in 354 feet of water some 23 miles offshore Taranaki, North Island, New Zealand, consists of a 432 foot tower topped by three deck levels for development drilling, production and processing of 660 MMscfd of gas and 20,000 bpd of condensate through 12 wells. The four legged tower is 70x 160 feet at the top and 160 × 160 feet at the base with the broad sides battered and the narrow sides vertical (Fig. 2). Two of the legs are 22 feet in diameter necking down to 6 ft. at the top. The legs served as pontoons to float the tower on a 5200 mile journey from the fabrication site in Japan to New Zealand. The other two legs are 6 feet in diameter increasing to 16 feet in the bottom panel. The tower is anchored to the seabed with twenty-eight 48 inch diameter steel piles driven to 240 feet penetration. The tower float out weight is 14020 kips. Maximum deck loading is 24000 kips. The mass for calculations of the dynamic properties of the platform is 100,000 kips, which includes added mass. Steel specifications called for normal DIN steel with 50 ksi yield strength. To enhance the resistance of the structure to fatigue, improved DIN steel, with special impact and through-thickness properties, was specified at the joints. Approximately 2500 kips of this special steel was required. Further discussions of the tower is given in Ref. 1 and 2." @default.
• W2078378045 created "2016-06-24" @default.
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• W2078378045 date "1976-05-02" @default.
• W2078378045 modified "2023-09-26" @default.
• W2078378045 title "Evaluation of Fatigue Considerations in the Design of Framed Offshore Structures" @default.
• W2078378045 doi "https://doi.org/10.4043/2609-ms" @default.
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