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| Research of damage detection to offshore platforms based on modal strain energy method considering the temperature gradient |
| Liu Ke-fei1, Shi Xiang1, Zhou Lei2, Wang Feng-yun2 |
| 1. Engineering College in Ocean University of China, Qingdao 266071 China;2. Offshore Oil Engineering Co., Ltd, Tianjin 300451 China |
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Abstract For offshore jacket platforms, the influences of seawater temperature gradient on modal strain energy method, which is one of the methods for structural global damage detection, were studied. Taking a Jacket-type offshore platform as a model, the finite element model under the simulated seawater temperature gradient was built regarding the influences of temperature on steel elastic modulus. By detecting and analyzing the damage simulated on this model using mode strain energy method, the influence rules of temperature gradient on damage detection to offshore platform based on modal strain energy method were summarized. It is demonstrated that the temperature gradient weakens the ability of damage location using the method, especially for the members with greater structure redundancy, and it also reduces the precision of damage extent detection, the reduction will be greater for the members with greater structure redundancy and lower damage extent.
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Received: 30 November 2010
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Corresponding Authors:
Liu Ke-fei
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2012, Vol. 31 
