Journal
STRUCTURE AND INFRASTRUCTURE ENGINEERING
Volume 9, Issue 5, Pages 481-495Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/15732479.2011.564635
Keywords
hybrid genetic algorithm; finite element model updating; genetic algorithm; simplex method; modal properties
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Funding
- Modular Bridge Research Centre from Construction Technological Innovation Programme [10TIB01]
- Ministry of Land, Transport and Maritime Affairs of Korean government
- Korea Agency for Infrastructure Technology Advancement (KAIA) [55246] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Finite element (FE) model-based dynamic analysis has been widely used to predict the dynamic characteristics of civil structures. FE model updating method based on the hybrid genetic algorithm, by combining genetic algorithm and the modified NelderMead's simplex method, is presented to improve bridge structures' FE model. An objective function is formulated as a linear combination of fitness functions on natural frequencies, mode shapes and static deflections using measurements and analytical results to update both stiffness and mass simultaneously. A commercial FE analysis tool, which can utilise previously developed element library and solution algorithms, is adopted for applications on diversified and complex structures. The validity of the proposed method is verified by using a simply supported bridge model with three I-shaped girders. FE models such as grid, beam-shell and shell model are considered to modify initial FE models on the experimental structure. Experimental results suggest that the proposed method can be applied efficiently to various FE models and is feasible and effective when this method is applied to identify FE modelling errors.
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