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Design method for simplifying fatigue for semi-submersible type platform structure

A semi-submersible platform with a simplified structure, applied in calculation, special data processing applications, instruments, etc., can solve the problems of less applications and difficult calculations, and achieve accurate calculation results, accurate analysis results, and less workload.

Active Publication Date: 2009-12-30
CHINA NAT OFFSHORE OIL CORP +1
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Problems solved by technology

Due to the lack of long-term distribution of Weibull distribution shape parameter data of the structural stress of the semi-submersible platform under the environmental conditions in the South China Sea, and the difficulty in calculating the maximum hot spot stress range during the life of the semi-submersible platform, the simplified fatigue analysis method is not suitable for semi-submersible platform structures. Few applications in fatigue design

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  • Design method for simplifying fatigue for semi-submersible type platform structure
  • Design method for simplifying fatigue for semi-submersible type platform structure
  • Design method for simplifying fatigue for semi-submersible type platform structure

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Embodiment Construction

[0015] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 Shown, the present invention comprises the following steps:

[0017] 1. Carry out long-term forecast of wave load on semi-submersible platform (hereinafter referred to as platform):

[0018] Calculate the wave load of the platform based on the long-term sea state data of the platform's operating sea area, and make a long-term forecast of the wave load once encountered in the life of the platform, and obtain the maximum wave load in the life of the platform, including transverse wave tearing force, transverse wave torque, and longitudinal wave shear force , vertical wave bending moment, longitudinal deck mass inertial force and transverse deck mass inertial force.

[0019] 2. Determine the long-term Weibull distribution shape parameters of platform structural stress:

[0020] ①Establish the finite element model of the overall...

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Abstract

The invention relates to a design method for simplifying fatigue for a semi-submersible type platform structure, comprising the following steps: (1) a semi-submersible type platform wave loading long-term forecast is carried out; (2) semi-submersible type platform structure stress long-term Weibull distribution shape parameter is determined; (3) the return-period maximum permissible stress range curve of the semi-submersible type platform structure life period is determined; (4) the return-period hotspot stress range of the semi-submersible type platform structure life period is calculated; (5) the fatigue life of the semi-submersible type platform structure is estimated. Compared with the existing fatigue design method of the platform structure, the design method for simplifying fatigue for semi-submersible type platform structure provided by the invention has the advantages of small workload and accurate calculation result, and can be used in the structure fatigue design of the semi-submersible type platform in the South China Sea.

Description

technical field [0001] The invention relates to a fatigue design method of an ocean engineering structure, in particular to a simplified fatigue design method of a semi-submersible platform structure adapted to the environmental conditions of the South China Sea. Background technique [0002] At present, semi-submersible platforms are generally constructed of high-strength and ultra-high-strength steel. They have the characteristics of simple structure, large operating water depth, adaptability to harsh operating environments, and large variable loads. They are widely used in marine engineering. When the semi-submersible platform is operated at sea, due to the action of waves, the constantly changing wave loads will cause changing cyclic stresses inside the platform, and the fatigue damage caused by these cyclic stresses is a major form of platform failure. [0003] Fatigue analysis of semi-submersible platform structure is a very complex engineering practice problem. The si...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 谢文会谢彬
Owner CHINA NAT OFFSHORE OIL CORP
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