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곽종원(Kwark Jong Won),진원종(Chin Won Jong),최은석(Choi Eun Suk),강재윤(Kang Jae Yoon),김병석(Kim Byung Suk) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
A study has been performed to investigate on the dynamic behavior of bridges crossed by the KTX(Korea Train express). The investigated bridge is a 2-span continuous concrete box bridge with spans of 40 m length named Yeon-Jae bridge. We have performed many field tests on the dynamic behaviors of a real bridge for KTX using various sensors. For this study, various sensors have been installed on the Yeon- ]ae bridge located in the experimental section of the KHSR(Korea High-Speed Railway) track and tests have been performed. Through this study, it is known that effects of local modes and sleepers in the box-girder bridge for the KTX on the dynamic responses is remarkable. Therefore, in the investigation on the accelerations of the box-girder bridge, three dimensional model should be adopted in numerical analysis including the effects of sleepers. The effect of temperature on the accelerations of the bridge should be investigated in the further studies to determine the reason of excessive acceleration.
경부고속철도 교량의 과도한 가속도의 저감방안에 대한 연구
곽종원(Kwark Jong-Won),진원종(Chin Won-Jong),최은석(Choi Eun-Suk),조정래(Cho Jeong-Rae),이정우(Lee Jung-Woo) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
When Korean High Speed Train (KTX) runs over a high-speed railway bridge, the high-speed railway bridge gives quite large acceleration response. Local vibration at the large cross section, the impact from equally spaced sleepers, the vibration due to elastomeric bearings, and the vibration from the train itself are the causes of this acceleration response. Maximum peaks of the accelerations measured at the bridges are sometimes going over the limit value. Although it is smaller than 0.35G, the limit from the Korean Bridge Design Manual(BRDM), this acceleration response should be reduced for the safety of running trains with high speed. In this paper, to reduce the acceleration response by controlling excessive local vibration at the large cross section, vibration reduction method is studied. The result shows that the effect of elastomeric bearings on the vibration of the bridge is very large and that the vibration reduction device is effective against wing mode local vibration PSC box girder bridge for the high-speed railway, which usually has very large cross section, although it has little effect on global vibration modes such as flexural and twisting modes. The test of the vibration reduction device on the bridge in service has been performed in this study.
곽종원(Jongwon Kwark),고상규(Sangqyu Ko),곽임종(Imjong Kwahk),최은석(Eunsuk Choi),이정우(Jungwoo Lee) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
지진하중을 받는 교량구조물에서 교각은 외력에 저항하는 가장 중요한 구조물이다. 지진이 교량에 작용할 때 교각의 내진성능을 확보하기 위한 설계기준에 따른 설계와 새로운 교각형식에 대한 내진성능의 확인을 위해서 수많은 교각실험이 수행된다. 실제 지진이 동적하중이므로 이를 온전히 모사할 수 있도록 성능평가 실험이 이루어져야 하나 현실적으로 규모와 장비 그리고 비용적인 제한에 의해서 일반적으로 유사정적 실험으로 실제거동에 최대한 가깝도록 실험을 수행한다. 이러한 교각의 유사정적 실험 시에 많은 조건과 변수들에 의해서 실험오차가 발생하므로 이를 최소화하기 위한 설치 및 수행이 이루어져야 한다. 본 연구에서는 유사정적실험 시에 발생할 수 있는 오차를 확인하고 이를 최소화할 수 있는 실험방법에 대해서 고찰하고자 한다. Piers are most important structures in railway bridges for aseismic behavior. Numerous experiments to identify the seismic performance of bridge piers are implemented for seismic design goals. It is quite difficult to model the dynamic nature of earthquakes due to cost problems mainly concerned to capacity and performance of test facilities, so that quasi-static test method is generally used to model bridge piers under earthquake approximately. In the quasi-static test procedure, test errors from various cautions can affect test results. In this paper, test errors in quasi-static test procedure are analyzed and some improvements to minimize the test errors are proposed.