三塔柱四跨脊背橋靜力分析

Static Analysis of Extradised Bridge with Triple Pylons

吳忠諺(Chung-Yen Wu)

指導教授 ： 鄭金國

中原大學/工學院/土木工程研究所/碩士(2011年)

https://doi.org/10.6840/cycu201100685

摘要

脊背橋外觀雖類似斜張橋，具有主梁、橋塔與斜張鋼纜，但結構特性融合了斜張橋與預力梁橋。脊背橋之抗彎矩剛度主要仍由有內置預力的主梁梁體提供，而外置預力宛如斜張橋的鋼腱，用以調整主梁之彎矩分佈，其主梁梁深相較之下小於預力梁橋，可營造輕巧之意象，整體造型新穎，結構強度和景觀的兼容性。
本文首先針對脊背橋作一整體介紹，包含脊背橋之導覽及依據規範作為結構分析和設計準則。再以臺灣一個實際案例的靜力分析來說明脊背橋的設計原則和結構行為，最後就分析之結果作ㄧ討論及建議。
本文應用有限元素分析軟體TANGO程式進行脊背橋之分析研究，討論脊背橋在不同載重組合下，結構之內力、位移及外置鋼腱之索力變化，再進一步從包絡線分析中，檢驗組合應力是否合乎規範要求。

關鍵字

脊背橋 ； TANGO

並列摘要

Extradosed bridges are similar in appearance to cable-stayed bridges, it have girders, pylons, and cables, however, extradosed bridges are combined of cable-stayed bridges and prestressed girder bridges in terms of structural characteristics. The moment-resistance stiffness are provided by the deck which is prestressed by internal cables. The function of external cables are similar to cable-stayed bridge that can be used to adjust the bending moment distribution of the deck. The girder depths of the extradosed bridges are shallower than those of the prestressed box girder bridges giving the extradosed bridges design a lighter and airy presence. The overall structure presents a novel look which highlights its structural strength and landscape compatibility.
The first part of this thesis focuses on the general introduction of extradosed bridge, including the historical review, structural analysis and design criterion based on the specifications. The second part analyzes a practical example designed by Taiwan engineers in order to illustrate the fundamental principles and structural behaviors of extradosed bridge. Finally, a discussion and suggestion is presented based on the results of the previous analysis.
A software program TANGO written by Finite Element Method is used in this thesis to do the analysis. The variation of internal forces, displacements and cable forces under various load combinations have been studied. The envelopes of influence lines is drawn to ensure the stress which meets the requirements of design codes.

並列關鍵字

extradosed bridge ； Tango

參考文獻

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