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http://dx.doi.org/10.5000/EESK.2006.10.6.115

Dynamic Characteristics of Seohae Cable-stayed Bridge Based on Long-term Measurements  

Park, Jong-Chil (한국도로공사 도로교통기술원)
Park, Chan-Min (한국도로공사 도로교통기술원)
Kim, Byeong-Hwa (포항산업과학연구원 강구조연구소)
Lee, Il-Keun (한국도로공사 서해대교관리소)
Jo, Byung-Wan (한양대학교 토목공학과)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.10, no.6, 2006 , pp. 115-123 More about this Journal
Abstract
This paper presents long-term dynamic characteristics of a cable-stayed bridge where installed SHM (Structural Health Monitoring) system. Modal parameters such as natural frequencies and mode shapes are identified by modal analysis using three dimensional finite element model. The developed baseline model has a good correlation with measured natural frequencies identified from field ambient vibrations. By statistical data processing between measured natural frequencies and temperatures, it is demonstrated that the natural frequency is in linearly inverse proportion to the temperature. The estimation of temperature effects against frequency variations is performed. Mode shapes are identified from the TDD (Time Domain Decomposition) technique for ambient vibration measurements. Finally, these results demonstrate that the TDD method can apply to identify modal parameters of a cable-stayed bridge.
Keywords
cable-stayed bridge; vibration; modal analysis; time domain decomposition; temperature effect;
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