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http://dx.doi.org/10.7734/COSEIK.2017.30.1.39

Model Updating of a RC Frame Building using Response Surface Method and Multiobjective Optimization  

Lee, Sang-Hyun (Department of Architectural Engineering, Hanyang Univ.)
Yu, Eunjong (Department of Architectural Engineering, Hanyang Univ.)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.30, no.1, 2017 , pp. 39-46 More about this Journal
Abstract
In this paper, a model updating procedure based on the response surface method combined with the multi-objective optimization was proposed and applied for updating of the FE models representing a low-rise reinforced concrete building before and after the seismic retrofit. The dynamic properties to be matched were obtained from vibration tests using a small shaker system. By varying the structural parameters according to the central composite design, analysis results from the initial FE model using a commercial software were collected and used to produce two regression functions each of which representing the errors in the natural frequencies and mode shapes. The two functions were used as the objective functions for multi-objective optimization. Final solution was determined by examining the Pareto solutions with one iteration. The parameters representing the stiffnesses of existing concrete, masonry, connection stiffness in expansion joint, new concrete, retrofitted members with steel section jacketing were selected and identified.
Keywords
FE model updating; response surface method; multi-objective optimization; vibration test; system identification; seismic retrofit;
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