Staged structural damage assessment method for aging offshore platforms

Abstract

The invention provides an evaluation method of phased structural damage of an aged offshore platform. The method can overcome the defect that in traditional damage evaluation indexes, a real structural rigidity matrix is replaced by a finite element model rigidity matrix and can effectively eliminate the influence of damage accumulated before the offshore platform is tested for the first time on later-period damage. According to two adjacent vibration test data of the offshore platform, the damage conditions of the platform between two dynamic testing periods can be clearly judged, and then the problems that an existing offshore platform lacks measured data but must relies on existing test data to be evaluated are solved.

Description

technical field [0001] The invention relates to a staged structural damage assessment method of an aging ocean platform. Background technique [0002] Offshore oil development is a comprehensive project involving various disciplines and technological departments. Offshore platforms, as large and complex structures for various purposes such as drilling, oil extraction, and living supplies, have a direct impact on the progress of offshore oil development. The structure of offshore platforms is complex and expensive. Compared with land structures, the service environment is harsher. The offshore platform structure has served in the harsh marine environment for a long time, and is subject to the interaction of various loads, such as wind loads, currents, wave loads, ice loads, etc., and sometimes unexpected shocks such as earthquakes, typhoons, tsunamis, and ship collisions. The structure itself is also subject to environmental corrosion, marine growth, and seabed scour. Unde...

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Problems solved by technology

[0004] However, for the aging platforms in the middle and late stages of service, there are very few effective vibration data for the purpose of structural damage detection of offshore platforms, and the first platform test after several years of service on the offshore platform will be due to the accuracy of the finite element model. The problem affects the evaluation of the accumulated damage of the platform structure before the first test. This situation has become a bottleneck for the effective assessment of the aging jacket type offshore platform. Periodic dynamic testing of the aging platform and a reasonable assessment of whether the structure has occurred during the test Damage has become a feasible strategy to ensure the safe service of more than 100 aging platforms in China

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