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The Wind-Resistant Design and Wind Tunnel Tests of a Cable Stayed Bridge
|關鍵字:||cable stayed bridge|
As the safety of the traditional short-span bridges are threatened by the reducing bed elevation of the rivers crossing the west island of Taiwan in the recent decade. The development of cable-stayed bridges, therefore, is one of the solutions to this problem. These long span and slender section bridges were found to be more flexible and sensitivity to wind excitation. Especially the flutter and the buffeting responses are the major concerns for the bridge engineers. Detailed information on wind around the bridge site is important in determining the wind speed for design and the conducted wind tunnel tests. In this study, all aspects of wind design and different models of wind tunnel tests are discussed. The aero-elastic phenomenon coming from aerodynamics of cable-stayed bridges are introduced as well. A three-dimensional analysis for critical wind speed which results in the initiation of a flutter and buffeting motions of a cable-stayed bridge will lead to a more reasonable result. Section model test of Han Hsi Cable-Stayed Bridge are conducted to describe the flutter wind speed and the vortex shedding responses under smooth and turbulent flow. The results show, in service condition, the bridge will be safe for flutter under the design wind speed. And the vortex induced shedding can be neglected under turbulent flow.
|Appears in Collections:||土木工程學系所|
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