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CSME 2020/08
Volume 41 No.4
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449-456
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Structural Damage Detection Based on Measurement Point Layout and Model Updating Method
Nien-Lung Leea
aIndependent Researcher, No. 173, Henan Rd., Lingya Dist., Kaohsiung City 802027, Taiwan (R.O.C.).
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Abstract:
In this study, a method is proposed for detecting the structural damage position and extent by combining the measurement point layout and model updating method. Initially, the finite element analysis (FEA) model of the structure is applied to evaluate the appropriate measurement point layout for the modal test. The method proposed in this study is based on the functional complementarity of the integrated modal kinetic energy (MKE) and Hemez methods. The method includes the MKE cumulative value for the number of measurement points and the Hemez method for reasonable positions. Model variables, such as the cross-sectional area and quadratic moment of inertia, are used to represent the geometrical or material properties of the structure. Further, the model updating method takes advantage of the eigensensitivity matrix, and the model variables of the FEAmodel are updated by iterative calculation. The results demonstrate that the analysis results of the updated model variables of the FEA model can approach the pre-simulated damage positions and extent of the reference model. The measurement and model updating methods developed in this study can be applied for the monitoring and early warning of structural damage.
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Keywords: Iterative methods, sensitivity-based iterative model updating method, finite element model, damage detection
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*Corresponding author; e-mail: plinlin@yahoo.com.tw
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©
2020
CSME , ISSN 0257-9731
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