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Title: Structural damage identification from measured vibration modal data
Author: Chen, Hua-Peng
ISNI:       0000 0001 3532 6965
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1998
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A novel non-linear perturbation theory based on the characteristic equations for structural dynamic systems is developed, which can provide an exact relationship between the perturbation of structural parameters and the perturbation of modal parameters. Then, depending on information about different types of the measured vibration modal data available, a system of governing equations based on the developed theory is derived, which can be utilised for general applications, such as eigendata modification, model updating, and damage identification, suitable for all types of structures, including framed structures and continua. A number of computational procedures based on the derived non-linear governing equations are presented for structural damage identification, which can be suitable for various cases of the measured vibration modal data available, such as only natural frequencies, complete mode shapes, locally complete mode shapes, and incomplete mode shapes. The effectiveness and convergence performance for the proposed approaches are demonstrated by various numerical examples, and the sensitivities of many factors to inverse predictions of structural damage are also investigated. The results for different types of structures, either framed structures or continua, indicate that the proposed approaches can be successful in not only predicting the location of damage but also in determining the extent of structural damage, while at the same time information about only a limited amount of the measured modal data is required. Furthermore, it is found that the proposed approaches are capable of providing information on the exact expanded damaged mode shapes, even if a very limited DOF's readings are available. Structural modelling problems, which have to be considered in structural analysis and damage identification, are discussed. It is shown that structural damage can be identified correctly from the proposed approaches using information about different types of the measured modal data, regardless of different structural models considered and different types of elements used. Therefore, a suitable structural model can be selected in order to properly identify structural damage depending on the available information about modal data
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: TA Engineering (General). Civil engineering (General)