斜張橋同時包含了受壓及受拉體系,斜拉索能提供橋梁斜拉力的支撐,減少橋梁上的載重負擔,也因此斜張橋能達到材料節省使用的目的,更進一步能加大橋梁跨徑長,增加結構系統效益等優點,以更輕巧節省的結構形式,追求更好的工程效益。 在大量節省構材的優點下,相對必須更加精密計算橋梁的力學行為,對於斜拉索張力桿力需嚴加分析。更因應將來配合環境美化趨勢,各種形式的橋塔、主梁一直在求新求變,所以對斜張橋的各種構件更必須有系統的分析檢核。 針對斜張橋在不同主梁勁度以及不同載重組合下,探討主梁EI值、纜索內力對橋梁彎矩變化的相關性,分別執行靜力與動力分析,以探討斜張橋之各種力學行為,使用分析軟體TANGO以及SAP2000分析其靜力與動力行為,並以一設計實例加以探討並驗證。
Cable-stayed bridge is a kind of bridge structure subjected to tension and compression. Cables are used to pull the deck to reduce the bending moments on the deck and transfer the compression to the pylon. Therefore, this type of bridge can achieve the goal of saving material and increase the effectiveness of the structural systems. This study aims to study the structural behavior of the bridge. Moreover, in order to follow the trend of creating better landscape in the future, different shape of pylon and deck of Cable-stayed bridges are analyzed and examined carefully. This research focuses on the investigation of the correlation of cable forces and bending moments of deck under reduced girder stiffness and different load combinations. It also analyze the dynamic and static behaviors through a software program TANGO and SAP2000. This study uses a real designed bridge to verify the criterion and specification.
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