自錨式吊拉組合橋風致反應特性之探討

Investigation on the Wind-Induced Response Characteristics of Self-Anchored Cable-Stayed Suspension Bridge

陳吟亘(Yin -Shiuan Chen)

指導教授 ： 高金盛

共同指導教授 ： 苟昌煥

淡江大學/工學院/土木工程學系碩士班/碩士(2011年)

https://doi.org/10.6846/TKU.2011.00207

摘要

自錨式吊拉組合橋造型優美，由主梁、橋塔、主纜、斜拉索及垂直吊索組合而成，兼具懸索橋與斜張橋的優點，為一種新型結構體系的橋梁，相較於懸索橋，具有較高的抗風穩定性；相較於斜張橋，不僅具有較低的橋塔高度，且能避免兩側過長過斜的斜拉索無法有效發揮吊拉效果的問題，在國內具有相當大的應用空間。
本文針對自錨式吊拉組合橋的風致反應特性進行分析與探討比較，文中利用套裝軟體ANSYS分析探討自錨式吊拉組合橋在設計靜風荷載及不同風速之靜風荷載作用下的靜態風致反應，亦分析探討幾何形狀變化及子結構勁度變化對自錨式吊拉組合橋風致反應之影響。研究結果顯示，在幾何形狀變化中，以輔助墩變化對自錨式吊拉組合橋風致反應之影響最大。另外，在子結構勁度變化中，主纜子結構勁度變化對自錨式吊拉組合橋風致反應之影響最大。
本文亦以反應面法分析探討材料的不確定性對自錨式吊拉組合橋風致反應之影響。研究結果顯示，反應面法是一種簡便有效的隨機分析方法。

關鍵字

吊拉組合橋 ； 自錨式 ； 靜風荷載 ； 隨機分析 ； 反應面法

並列摘要

A self-anchored cable-stayed suspension bridge, including main girder, tower, main cable, stayed cables and vertical hangers, is characterized by its elegant structural shape. It possesses combines merits of both a self-anchored suspension bridge and a cable-stayed bridge, which forms a totally renewed structure mechanism. This research intends to analyze and investigate the static-wind-induced response of a self-anchored combined cable-stayed suspension bridge. The main contents and outcomes of this research are as follows.
This research established the numerical models and performed the detailed analysis to investigate the characteristics of wind-induced response of self-anchored cable-stayed suspension bridge. The ANSYS program is used to analyze and investigate the wind-induced response of a self-anchored cable-stayed suspension bridge under the action of design static wind and static wind with different velocity. The impact of the variations of stiffness of sub-structures and geometric shape on the wind-induced response of a self-anchored cable-stayed suspension bridge are also analyzed and investigated in this research. This results have shown that, when the stiffness was varied, the main cable has the greatest impact on the wind-induced response of self-anchored cable-stayed suspension bridge. However, when the geometric shape was varied the auxiliary piers has the greatest impact on the wind-induced response of self-anchored cable-stayed suspension bridge.
Finally, this research used the response surface approach method to perform the influence of the uncertainties of material to the wind-induced response of self-anchored cable-stayed suspension bridge. The influence of the uncertainties of material to the structures deflection and sub-structures moment of self-anchored cable-stayed suspension bridge under static-wind load were also investigated as well. The results have shown that the response surface approach method is an effective method for the stochastic analysis of the suspension bridge.

並列關鍵字

Cable-stayed Suspension Bridge ； Self-Anchored ； Static Wind Load ； Stochastic Analysis ； Response Surface Approach Method

參考文獻

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