| Summary: | 碩士 === 中華大學 === 土木工程學系碩士班 === 94 === Among large span cable-stayed bridges, the free vibration of the cable system comprising cables of different length covers a wide range. Under reaction to a vehicle, earthquake or wind/rain fall load, the local vibration of cables tends to induce coupled vibration with the bridge mechanism. This coupled vibration not only alters energy distribution of the cable stayed bridge but also affects damping characteristics of the vibration mechanism. The study simulates cable vibration with multi-particle model, and considers modal shape of cables as a “degree of freedom” according to the broader definition of generalized degree of freedom. The study finds that the carbon fiber cable, in comparison with the steel cable, has a better performance to avoid generation of coupled vibration in the cable-stayed bridge, and a lighter seismic response as well. Therefore a cable-stayed bridge with carbon fiber cables prevails over a cable-stayed bridge with steel cables in terms of seismic endurance.
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