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Experiment Study on Damage Identification of Offshore Platform Structures Based on Model Updating
Pages: 113-120
Year: Issue:  5
Journal: Journal of Ocean Technology

Keyword:  damage identificationmodel updatingoffshore platformregularization;
Abstract: Damage identification is the key issue of structural health monitoring on offshore platforms, which is of great significance to ensure the safe service of structures. The Cross Model Cross Mode updating method is applied to identify the damages of the offshore platform structure. Regularization method of Truncated Singular Value Decomposition is introduced to solve the problem of "ill-conditioned" model updating equations, when the measured modes are noise polluted. Then, a damage identification process based on regularized model updating is produced. To ascertain the feasibility of the method, a simplified steel scale model of a jacket platform is manufactured, and damage is preset in two typical members. Vibration test of the model structure is carried out by impact excitation. Then, according to the results of model identification, the preset damage cases are identified by the regularized model updating process. Results show that using limited low-order and noise polluted modes,with the help of regularization solution technique, this model updating method can effectively identify the damage of the jacket platform structure.
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