摘要
　　由於施工技術的提昇，造型優美的現代斜張橋近幾十年來成為世界各國逐漸採用之橋樑型式。隨著跨度的增加，斜張橋的基本特性越來越複雜，對於這類橋樑的安全評估也日益重要。本文利用現場及試驗室試驗、模式分析與設計規範比較之方法，研究台灣地區第二高速公路南部路段高屏溪斜張橋之行為，並介紹該橋之監測計畫。

　　有關試驗的內容包括：(1)利用施工階段斜張鋼纜之施拉預力時建立斜張鋼纜預力之監測流程及確認斜張鋼纜之有效弦長，(2)載重試驗階段之預力主梁及鋼梁變形、預力主梁之應變及斜張鋼纜之預力變化，(3)橋塔底部混凝土之乾縮及潛變資料。模式分析的內容包括：(1)三維電腦分析模式，(2)ACI 209針對混凝土乾縮潛變之預測模式，(3)ASCE、AASHTO及中國大陸等有關斜張橋設計指針。研究結果顯示：(1)監測系統能合理反應斜張橋塔於施工階段之結構行為，而且不只是混凝土的應變，鋼筋之應力都會受到混凝土的乾縮潛變之影響而持續變化，(2)斜張鋼纜兩端喇叭套筒頂端與橡膠制振器中點之距離大約為鋼纜有效弦長，此有效長度之確認提供本橋日後檢測斜張鋼纜預力時之重要參考，(3)本研究所建立之三維有限元素分析模式能有效的預測斜張橋於載重試驗時規劃載重之主梁變形、PC主梁之縱向撓曲應變及斜張鋼纜之預力變化等結構行為。

ABSTRACT

　Modern cable-stayed bridges, aesthetically appealing and technically innovative, have become increasingly popular world wide in the past decades. With the increasing span length, the fundamental behavior and characteristics of cable-stayed bridges become more complex and important for evaluating the safety of these bridges. This thesis presents a study on the behavior of Kao-Ping-Hsi Cable-Stayed Bridge, one of the major southern construction projects on the Second Freeway in Taiwan, based on testing data compare with analytical models and design specifications. The monitoring system of this bridge is also presented.

　The experimental works include: (1) prediction of the effective length of stayed cables and variation of cable forces under field load testing, (2) main girder deflections and PC girder strains, and (3) shrinkage and creep strains of concrete at the base of pylon. The analytical methods include: (1) 3D computer analytical model, (2) ACI 209 predicted model for shrinkage and creep strains of concrete, and (3) ASCE, AASHTO, and China design specifications. The results show that: (1) the measured data of monitoring system can reasonably reflect the behavior of pylon under construction stage, (2) the effective length of the stayed-cable is approximately the length between the two mid-points of the neoprene seal and the trumpet end, and (3) the 3D finite element model can reasonably predict the structural behavior of the bridge, including main girder deflections, longitudinal flexural strain, and the variation of cable forces, under the various load conditions carried out in this study.

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