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김명원 ( Kim Myoung-won ),정희영 ( Jung Hye-young ),이창수 ( Lee Chang-soo ),최만용 ( Choi Man-yang ) 한국구조물진단유지관리공학회 2000 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.4 No.2
Civil structure such as a bridge is getting easily deteriorated because the traffic volume has been significantly increased during the several decades in Korea. The deterioration can be a main reason of the bridge col lapse like the case of Sungsoo Bridge. The earlier detection of a damage makes engineers possible to repair the bridge in time and economically. So far, a periodic visual inspection method as well as a non-periodic diagnosis techniques have been performed to identify a damage on bridges. However, these methods are known to be unsuitable to the global damage identification since physical internal damage of structures is not easily detected. A method using dynamic characteristics to identify damages of a bridge has been investigated in the States and several European countries since the late seventies. Because they are based on the physical quantities such as mass and stiffness, the natural frequencies are directly related to whether or not a bridge is damaged or not. In this paper, an ambient excitation field test was performed to a T beam RC bridge through step by step damage scenarios. The changes of natural frequencies from the modal analysis along the damage severities have been shown. The first three modes(bending, twisting and lateral modes) are found. Finite element method was used to compare and check the experimental results.
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