DESIGN OF JACKET PLATFORMS IN THE SOUTH PARS FIELD USING SEA-STATE LOAD-LEVELING

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IZADPARASTI A.H.; MAREFAT M.S.

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Journal: Year:2008 | Volume:42 | Issue:6 (116) Page(s): 669-680

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Information Journal Paper

Title

DESIGN OF JACKET PLATFORMS IN THE SOUTH PARS FIELD USING SEA-STATE LOAD-LEVELING

Author(s)

IZADPARASTI A.H. | MAREFAT M.S. | Issue Writer Certificate

Keywords

JACKET PLATFORMQ3

SEA STATE LOADINGSQ3

ULTIMATE LEVELQ3

DESIGN LEVELQ3

SOUTH PARS FIELDQ3

Abstract

JACKET PLATFORMs are the most common kind of platforms in the Persian Gulf. One of the most important loading conditions in the design of JACKET PLATFORMs is the sea-state loading. A sea-state loading consists of the simultaneous effects of environmental loadings e.g. wave, wind, and current loadings. Generally, JACKET PLATFORMs are designed and assessed for two levels of sea loads: design and ULTIMATE LEVELs. The design load level is basically utilized to design structural elements and satisfy standards requirements, while the ultimate load level is applied to evaluate the ultimate capacity of the structure. The ultimate-load level has traditionally been applied for assessing existing structures under ultimate capacity. In these structures, the overall performance of the structure is of interest and consequently the ultimate capacity of the structure is the main concern. However, earlier studies have indicated that applying two loading levels in design of new platforms may increase the reliability of the structure. In this study, these two levels are estimated for design of new JACKET PLATFORMs in the SOUTH PARS FIELD. For this purpose, first, target probabilities of failure are assigned to platforms in different categories of exposure. The categories of exposure are defined based on the recommendations of API-RP2A. Target probability of failure for each category of exposure is suggested considering not only values recommended by accepted sources in design of JACKET PLATFORMs but also by taking into account conditions surrounding SOUTH PARS FIELD. In order to evaluate the ultimate-load level, the probability of failure of a new JACKET PLATFORM is defined as a function of total base shear. The direct relation between total base shear and probability of failure is basically valid for platforms installed in water depth less than 100 (m) and is applicable to the major part of SOUTH PARS FIELD. Based on earlier studies, a simple parametric equation relating total base shear to wave height is used and the parameters are approximated analyzing actual platforms. Eventually, reliability analysis is utilized to estimate the ultimate sea-state loading level. In this study an estimate for design-load level is obtained by assuming/anticipating the reserve characteristics of platforms beyond the DESIGN LEVEL to the nonlinear regime. The anticipated reserve capacities of JACKET PLATFORMs are suggested for platforms with different number of legs and brace types. Using these, the design load level is calculated for platforms in different categories of exposure. As mentioned earlier, the structural elements, e.g. members, joints, and piles should be designed for this loading level. By way of illustration of the proposed procedure, a JACKET PLATFORM is designed using two levels of sea loadings.

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APA: Copy

IZADPARASTI, A.H., & MAREFAT, M.S.. (2008). DESIGN OF JACKET PLATFORMS IN THE SOUTH PARS FIELD USING SEA-STATE LOAD-LEVELING. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), 42(6 (116)), 669-680. SID. https://sid.ir/paper/14269/en

Vancouver: Copy

IZADPARASTI A.H., MAREFAT M.S.. DESIGN OF JACKET PLATFORMS IN THE SOUTH PARS FIELD USING SEA-STATE LOAD-LEVELING. JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN)[Internet]. 2008;42(6 (116)):669-680. Available from: https://sid.ir/paper/14269/en

IEEE: Copy

A.H. IZADPARASTI, and M.S. MAREFAT, “DESIGN OF JACKET PLATFORMS IN THE SOUTH PARS FIELD USING SEA-STATE LOAD-LEVELING,” JOURNAL OF FACULTY OF ENGINEERING (UNIVERSITY OF TEHRAN), vol. 42, no. 6 (116), pp. 669–680, 2008, [Online]. Available: https://sid.ir/paper/14269/en

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