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http://dx.doi.org/10.7734/COSEIK.2015.28.4.401

A Proposal of Model Updating Method for Steel Frame Using Global/Local Responses  

Oh, Byung-Kwan (Department of Architectural Engineering, Yonsei Univ.)
Choi, Se-Woon (Department of Architecture, Catholic Univ. of Daegu)
Kim, Yousok (Center for Structural Health Care Techhnology in Buildings, Yonsei Univ.)
Park, Hyo-Seon (Department of Architectural Engineering, Yonsei Univ.)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.28, no.4, 2015 , pp. 401-408 More about this Journal
Abstract
Conventional model updating methods for the structures have used global structural responses which are modal parameters obtained through vibration measurements. Although models updated by modal parameters estimate global structural responses accurately, they have difficulties to predict local responses for safety assesment of structural members. The safety of structural members in the structures has been evaluated through the stress estimation based on strain measurements. Thus, this study additionally uses measured strain responses of structural members to perform model updating besides modal parameters. In the proposed method, the objective functions are set to the differences of the global and local responses obtained from updated model and measurement and those functions are minimized by NSGA-II, one of the multi-objective optimization techniques. The strain responses predicted from updated model are used for safety assessment of the steel frame structures. The proposed method are verified by numerical and experimental studies through the impact hammer tests for a steel frame specimen.
Keywords
structural health monitoring; system identification; model updating; NSGA-II;
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