| Summary: | 碩士 === 國立臺灣大學 === 土木工程學研究所 === 96 === Cable-stayed bridge has recently been wildly accepted as a structure for crossing rivers, railways, or valleys due to its aesthetic configuration and relatively low construction cost. However, it is surprising to note that despite its wide popularity, some of the dynamic behaviors of the cables on a cable-stayed bridge under the moving vehicular loads remain obscured. Furthermore, vibrations of cables have been observed under the normal traffic with virtually no winds or very mild winds, which imply that the moving traffic flows may play an important role at the vibrations of cables mounted on cable-stayed bridge.
From the point of cable safety and maintenance, there exists a real need to study the vibration of cables mounted on a bridge under various traffic flows. In order to take as many as possible traffic flow cases into account, random traffic flow is introduced to the study. In the other hand, a thorough study is conducted for the pavement irregularities that may be present on cable-stayed bridges, through examination of the dynamic responses of the cables and bridge, from which it is concluded that the responses of cables in cable-stayed bridges will be amplified, when the frequency of the cable concerned coincides with any of the bridge or excitation frequencies. The results presented herein are useful for the design of bridge aimed at reducing the cable vibrations.
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