Comparative Study of Model Updating Methods Based on 2D Finite Element Models for a Practical Tower Structure

Numerous studies on sensitivity-based iterative finite element (FE) model updating methods have been widely discussed; however, comparative studies on the effectiveness of different types of baseline FE models for practical structures have received minimal attention. For the present study, we tested two Nanjing TV Tower two-dimensional FE baseline models with an eigensensitivity-based FE model updating procedure based on sub-beam and sub-frame elements. The dynamic characteristics of the two FE baseline models after iterative model updating were compared. In the comparison, a particular focus was placed on higher modes. In this paper, we discuss the above comparison, the convergence with which the FE model updating procedure updated the accuracy of measurements, and the results of the comparison. The findings indicate that when the sub-frame element formulation was applied, the relative differences in natural frequencies of higher modes, specifically from the fifth to the seventh modes, significantly improved after model updating. However, the sub-beam element formulation negatively affected the model updating results for the sixth mode. These results elucidate the roles of different types of two-dimensional FE baseline models implemented in the same three-dimensional practical structure.

並列關鍵字

iterative methods ； sensitivity-based iterative model updating ； finite element model

國際替代計量

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