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Title |
Distribution of Natural Frequency of 2-DOF Approximate Model of Stay Cable to Reduction of Area
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Authors |
조양희(Yang-Hee Joe) ; 이현철(Hyun-Chol Lee) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2014.18.6.147 |
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Keywords |
케이블 손상 ; 손상크기 ; 고유진동수 분포 ; 축강성 Cable Damage ; Damage Magnitude ; Natural Frequency Distribution ; Axial Stiffness |
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Abstract |
The cable damages of the bridge structures induce very important impact on the structural safety, which implies the close monitoring of the cable damage is required to secure sustained safety of the bridges. Most usual available maintenance techniques are based on the monitoring the change of the natural frequency of the structures by damages. However, existing method are based on vibration method to calculate lateral vibration and system identification can calculate the axial stiffness using sensitivity equation by trial error method. But the frequency study by the longitudinal movement need because of the sag effect in system identification. This study proposes a new method to investigate the damage magnitudes and status. The method improves the accuracies in the magnitudes and status of damages by adopting the natural frequency of longitudinal movement. The study results have been validated by comparing them with the approximate solution of FEM. Thus, the relationship of cable damage and frequency appear with relation that the severe damage has the little frequency. If we know the real frequency we can estimate the cable damage severity using this relationship. This method can be possible the efficient management of the cable damage.
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