雙塔柱部分外置預力斜張橋分析

本文首先介紹世界各地已建好的脊背橋，並比較設計的異同處；並以一雙塔柱部份外置預力斜張橋(脊背橋)為研究案例。本文以TANGO軟體探討在不同載重組合下，脊背橋的應力及撓度值。分析結果包含索力的變化、主樑位移、彎矩力、剪力與軸力。再進一步從包絡線分析中計算橋樑在載重組合下的應力範圍，及檢驗組合應力是否合乎規範要求。在最後的章節，討論所研究的結果以供後續研究者參考。

關鍵字

脊背橋；包絡線

並列摘要

The first part of this thesis is a general introduction of Extradosed Bridge of the world and a brief comparison. An analysis of a Extradoesd Bridge with double pylons is illustrated as a study example. This thesis applies TANGO software program to analyze the stress and deflection of a select Extradosed Bridge under different load combinations. The result of the analysis indicates girder deflection, bending moment, shear force, cable force, and axial force. Moreover, the envelopes of Influence Line under load combinations are built up to show the stress range of the bridge. Combined Stress and deflection are checked to make sure the design which statisfies the specifications and codes. A discussion is submitted in the final chapter for the future researchers.