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Title |
Flexural Vibration Characteristics of Prestressed Concrete Girders due to Changes in Prestress Forces
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Keywords |
프리스트레스트 콘크리트 거더 ; 진동응답 ; 가속도 신호 ; Prestressed concrete girder ; Vibration response ; Acceleration signal |
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Abstract |
In this study, several flexural vibration characteristics of prestressed concrete girders due to changes in prestress forces are experimentally analyzed. In order to achieve the objective, the following approaches are implemented. First, several methods to extract vibration response features from output-only signal are selected. Next, a large-scaled prestressed concrete girder model is constructed to analyze relation between the prestress forces and the vibration features in the prestressed concrete girder. Then acceleration responses are measured from the girder for several prestress force scenarios. Finally, vibration characteristics of the prestressed concrete girder due to change in prestress force are experimentally analyzed. The values of features extracted by the selected methods are reduced due to prestress-loss. Especially, the value of features are linearly reduced in the early prestress-loss.
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