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논문 기본 정보

자료유형
학술저널
저자정보
Inkyu Rhee (한국철도기술연구원) Lee-Hyeon Kim (한국철도기술연구원) Hyun-Min Kim (한국철도기술연구원) Joo-Beom Lee (한국철도기술연구원)
저널정보
한국철도학회 International Journal of Railway International Journal of Railway Vol.3 No.3
발행연도
2010.9
수록면
83 - 89 (7page)

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This paper attempts to extract the fundamental dynamic properties, i.e. natural frequencies, damping ratios of the 48 mlong, 20° skewed real bridge with PSC girders wrapped by a steel plate. The forced vibration test is achieved by mounting 12 ㎐-capacity of artificial oscillator on the top of bridge deck. The acceleration histories at the 9 different locations of deck surface are recorded using accelerometors. From this full-scaled vibration test, the two possible resonance frequencies are detected at 2.38 ㎐ and 9.86 ㎐ of the skewed bridge deck by sweeping a beating frequency up to 12 ㎐. The absolute acceleration/energy exhibits much higher in case of higher-order twist mode, 9.86 ㎐ due to the skewness of bridge deck which leads asymmetric situation of vibration. This implies the test bridge is under swinging vertically in fundamental flexure mode while the bridge is also flickered up and down laterally at 9.86 ㎐. This is probably by asymmetric geometry of skewed deck. A detailed 3D beam-shell bridge models using finite elements are performed under a series of train loads for modal dynamic analyses. Thereby, the effect of skewness is examined to clarify the lateral flickering caused by asymmetrical geometry of bridge deck.

목차

Abstract
1. Introduction
2. Test Bridge
3. Forced Vibration Test
4. FE Analysis for Skewness Influence
5. Conclusion
Acknowledgement
Reference

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