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Title |
Analysis of Vibration Characteristics Changes in a Single-Span Bridge Due to Temperature Using Continuous Measurement Data
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Authors |
권태호(Tae-Ho Kwon) ; 김병철(Byeong-Cheol Kim) ; 박기태(Ki-Tae Park) ; 전치호(Chi-Ho Jeon) |
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DOI |
https://doi.org/10.11112/jksmi.2024.28.5.62 |
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Keywords |
진동; 구조안전모니터링; 온도영향; 단경간교; 커널밀도추정; 고속푸리에변환 Vibration; Structural health monitoring; Temperature effect; Single-span bridge; Kernel density estimation; FFT |
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Abstract |
The Republic of Korea experiences four distinct seasons, with significant temperature differences between summer and winter, causing bridges to undergo large temperature variations throughout the year. When the temperature changes, the dynamic characteristics of bridge structures also change.
However, during load-bearing capacity assessments in domestic bridge maintenance, this temperature effect is not considered, and only the natural frequency measured over a short period is used for evaluation. In this paper, we theoretically analyze the impact of changes in natural frequency on bridges and extract daily estimated natural frequency data from bridges with continuous vertical acceleration measurements taken over more than a year to confirm temperature-induced changes. The results show that a 1% decrease in natural frequency corresponds to an approximately 2% decrease in the load-bearing capacity of the bridge. Additionally, it was found from the measurement data that a 10°C increase in temperature did not affect the natural frequency of RC slab bridges and Rahmen bridges, but in PSC-I girder bridges and steel box girder bridges, the natural frequency decreased by approximately 1.04% to 2.48%.
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