Identification of System Frequency Variations in Vehicle–Bridge Interaction Systems

Jaehun Lee; Young Jae Lee; Robin Eunju Kim

doi:10.7734/COSEIK.2022.35.1.23

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2022 Vol.35, Issue 1 Preview Page Next Page

Research Paper

Identification of System Frequency Variations in Vehicle–Bridge Interaction Systems 교량-차량 동적상호작용을 고려한 시간가변적 시스템 특성 분석

28 February 2022. pp. 23-28

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Abstract

Natural frequency variations in a vehicle–bridge interaction system is examined. The interaction system is designed for a simple beam subject to a moving vehicle. The equation of motion for the system is derived under the quarter–car condition, and numerical simulation is performed. Frequency amplification ratio (FAR) is defined as a ratio between the initial and the varying natural frequency of the system; a discontinuity in the FAR implies a resonance condition. Analysis is mainly focused on patterns, frequency variation characteristics, and discontinuity points of the FAR under the vehicle mass and tire stiffness variations. The result reveals that the interactions between the system affects the natural frequency of both the vehicle and the bridge in similar frequency regions that can be visually identified at the middle of the span using the FAR.

Keywords

FAR

simple beam

moving vehicle

vehicle-bridge interaction

natural frequency

본 연구에서는 차량-교량 상호작용 시스템의 고유진동수 변화를 분석하였다. 차량이 주행하는 교량의 동특성은 차량의 질량 및 진동을 무시하지 않는 경우 상호작용을 반영해야 하는데, 이때 시스템은 시간가변적이므로 고유진동수 또한 시간가변적인 특성을 보인다. 따라서 본 연구에서는 차량과 교량을 각각 2자유도를 갖는 시스템으로 모델링하여 차량의 위치와 질량비 그리고 시스템 강성비에 따른 시간가변적 고유진동수를 산출하였다. 분석 결과 일반적으로 초기 고유진동수가 작은 시스템은 상호작용으로 인하여 증폭비가 낮아지는 추세를 보이나 상호작용이 발생할 경우 증폭비는 분기점을 보이며 비선형적 추세를 보이는것을 알 수 있다. 따라서 상호작용이 발생하는 시스템차수에 대한 이해가 필요함을 알 수 있다.

키워드

고유값증폭비

단순보

이동차량

교량-차량 동적상호작용

고유진동수

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Information

Publisher :Computational Structural Engineering Institute of Korea
Publisher(Ko) :한국전산구조공학회
Journal Title :Journal of the Computational Structural Engineering Institute of Korea
Journal Title(Ko) :한국전산구조공학회 논문집
Volume : 35
No :1
Pages :23-28
Received Date : 2021-11-04
Revised Date : 2021-11-17
Accepted Date : 2021-11-17
DOI :https://doi.org/10.7734/COSEIK.2022.35.1.23

Journal of the Computational Structural Engineering Institute of KoreaISSN:1229-3059(Print) 2287-2302(Online)한국전산구조공학회

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