• Title/Summary/Keyword: 교량진동

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Extracting Modal Parameters of Railway Bridge under the Action of High-speed Train Using TDD Technique (TDD기법을 이용한 고속철도 교량의 동특성 추출)

  • Kim, Byeong Hwa
    • Journal of Korean Society of Steel Construction
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    • v.20 no.6
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    • pp.761-771
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    • 2008

  • When the crossing frequency of a train meets the natural frequency of a railway bridge, the bridge is bound to become resonant. There are few available time response samples involving a train that passes a bridge at high speed. Very effective modal-parameter extraction techniques for such special high-speed railway bridge conditions are introduced in this paper. Utilizing the cross-correlations of the free-vibration responses after the train passes, mode shapes and the temporal modal parameters (e.g., natural frequency and damping ratio) are extracted using the TDD and SI techniques, respectively. This approach has been applied to a two-span steel composite bridge in the Kyung-Bu high-speed railway system. The estimation results were compared with those obtained using the existing methods. The results fully coincide with those that were extracted using the existing aforementioned technique.

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Analysis of Dynamic Response Characteristics for KTX and EMU High-Speed Trains on PSC-Box Railway Bridges (PSC-box 철도교량의 KTX 및 EMU 고속열차에 대한 동적 응답 특성 분석)

  • Manseok Han;Min-Kyu Song;Soobong Shin;Jong-Han Lee
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.28 no.2
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    • pp.61-68
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    • 2024

  • The majority of high-speed railway bridges along the domestic Gyeongbu and Honam lines feature a PSC-box type structure with a span length ranging from 35 to 40m, which typically exhibits a first bending natural frequency of approximately 4 to 5Hz. When KTX high-speed trains transverse these bridges at speeds ranging from 290 to 310km/h, the vibration induced by the trains approaches the first bending natural frequency of the bridge. Furthermore, with the upcoming operation of a EMU-320 high-speed train and the anticipated increase in the speeds of these high-speed trains, there is a need to analyze the dynamic response of high-speed railway bridges. For this, based on measured responses from actual railway bridges, a numerical model was constructed using a numerical model updating technique. The dynamic response of the updated numerical model exhibited a strong agreement with the measured response from the actual railway bridges. Subsequently, this updated model was utilized to analyze the dynamic response characteristics of the bridges when KTX and EMU-320 trains operate at increased speeds. The maximum vertical displacement and acceleration at the mid-span of the bridges were also compared to those specified in the railway design standard with the increasing speed of KTX and EMU-320.

  • https://doi.org/10.11112/jksmi.2024.28.2.61 인용 PDF

Sensitivity-based BWIM System Using Dynamic Strain Responses of Bridge Deck Plate (교량바닥판의 동적 변형률 응답을 이용한 민감도 기반 BWIM 시스템)

  • Kim, Byeong-Hwa;Park, Min-Seok;Yeo, Keum-Soo;Kim, Soo-Jin
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.20 no.7
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    • pp.620-628
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    • 2010

  • Using the responses of deck plate, a new bridge weigh-in-motion system has been introduced. The approach includes not only a systematic algorithm for the extraction of moment influence sequence but also a sensitivity-based system identification technique. The algorithm indentifies the influence sequence, the axle loads, and axle location of moving vehicles on a bridge, simultaneously. The accuracy and practicability of the algorithm have been examined experimentally for a folded deck plate on Yongjong Grand suspension bridge. It turns out that the two-dimensional effects of the behavior of deck plate should be considered for further accuracy improvement.

  • https://doi.org/10.5050/KSNVE.2010.20.7.620 인용 PDF KSCI

Dynamic Characteristics of Seohae Cable-stayed Bridge Based on Long-term Measurements (장기계측에 의한 서해대교 사장교의 동특성 평가)

  • Park, Jong-Chil;Park, Chan-Min;Kim, Byeong-Hwa;Lee, Il-Keun;Jo, Byung-Wan
    • Journal of the Earthquake Engineering Society of Korea
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    • v.10 no.6 s.52
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    • pp.115-123
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    • 2006

  • 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.

  • https://doi.org/10.5000/EESK.2006.10.6.115 인용 PDF KSCI