| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 93 === The greatest characteristics of a civil engineering structure lie in its uncertainty of construction and huge scale. To account for the uncertainty of constructions, an important problem is to update the analysis model so that it can produce results as close as possible to those observed in field. As the scale of a structure is usually huge, a simple and fast method for model updating is the one most desired by engineers. The purpose of this thesis is to develop finite element model updating methods that are suitable for practical use. To facilitate the derivation, the most often used shear buildings are taken as the example of study.
In general, two categories of methods are used for model updating, i.e., the direct and parameter updating methods. The parameter updating methods were widely used because they can preserve the physical meanings of the updated matrices, but the procedure for determining the parameters is complicated. For buildings of the shear type, this paper presents a new way for selecting the parameters, by which the dominating parameters are preserved in the updating, while the procedure is greatly simplified. Furthermore, to circumvent the complicated procedures involved in parameter selection of the parameter updating methods, a direct model updating method is proposed. Compared with the existing ones, this method can be easily understood, while the physical meanings of the system matrices can be appreciated from the results of dynamic analyses. To demonstrate the applicability of the proposed updating methods, several typical examples that are likely to be encountered in practice were studied. It is confirmed that the proposed methods are workable.
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