臺北市社子大橋之分析與設計

The Analysis and Design of Shezi Brdige in Taipei

張英發(Eng-Huat Teo) ； 黃昭勝(Chao-Sheng Huang) ； 游明益(Ming-Yi Yu) ； 林曜滄(Yew-Tsang Lin) ； 張荻薇(Dyi-Wei Chang) ； 宋裕祺(Yu-Chi Sung)

《結構工程》 29卷2期 (2014/06) Pp. 104-134

https://doi.org/10.6849/SE.201406_29(2).0006

摘要

臺北市社子大橋係採用一傾斜橋塔搭配二跨不對稱主梁跨徑（180m+70m）之鋼斜張橋。本橋主梁長短跨比高達2.57，除於短跨處設置壓重混凝土外，並採用造型新穎的傾斜橋塔，配合最佳化鋼索預力的施加，克服上部結構主梁及橋面板等靜載重因長短跨徑差異而產生不平衡力的影響，達到符合力與美的設計目標。本橋配合180m中跨徑主梁之特性，採用自錨式（self-anchored）鋼索錨定方式，除滿足經濟設計之需求，在耐震設計方面依靜力分析進行設計，並採用動力歷時分析作為耐震性能檢核;在抗風設計方面，除依據橋梁設計規範之相關規定進行設計外，並以斷面模型及全橋模型之風洞試驗檢核相關空氣動力參數及受風反應，驗證本橋的的耐風性能並與設計階段風力作比對，確保本橋梁之耐風穩定。此外，為確保鋼索錨碇鄰近區域構造細節之安全性能，對錨碇區域進行有限元素局部應力分析，以判斷局部應力傳遞是否合宜。本橋在結構分析及設計上，有別於一般橋梁者，具備獨特性與困難度，為一難得之橋梁工程設計經驗，本文所得成果，冀可供為日後相關工程之參考。

關鍵字

斜張橋 ； 斜塔柱 ； 旋轉工法 ； 自錨式 ； 最佳化

並列摘要

Being an asymmetric span configuration (180m+70m), the SheZi Bridge in Taipei was designed as an inclined pylon steel cable-stayed bridge.As the asymmetric span configuration has a ratio of main span to side span up to 2.57, the loading of the superstructure generated a huge unbalanced effect to the pylon and the girder. Therefore, the counterweight concrete was designed for unbalanced loading effect, and the inclined pylon and the optimization post-tensioning cable force analysis were used to reduce the unbalanced effects caused by the static load applied and for enhancing the aesthetics design. As the span has a length of 180m, we used a self-anchored cable system for this bridge. Though the static analysis result was used for structural design, the dynamic analysis was also required. For the dynamic analysis of this bridge, both the response spectrum method and the time history method were used. To verify the wind resistance of the bridge and to obtain the aerodynamic parameters, the cross section model and the full model for wind tunnel tests were done to ensure the performance of the bridge's resistance to wind;and to make a comparison of the wind force during the design stage; and to double check the wind resistant design. In addition, to ensure the safety of the cable anchorage, the finite element analysis was done to verify the stress delivery. This article will take this bridge as an example, carry out the analysis and design of cable-stayed bridge with asymmetric span and inclined pylonhaving unique and difficulty, and provide as a reference for the engineering of related projects.

並列關鍵字

Cable-Stayed Bridge ； Inclined Pylon ； Rotating Method ； Self-Anchored ； Optimum