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研究生:陳振華
研究生(外文):Chen, Chern-Hwa
論文名稱:纜索支撐橋梁受風力之反應
論文名稱(外文):Wind-induced response of cable-supported bridges
指導教授:楊永斌楊永斌引用關係
指導教授(外文):Yang Yeong-Bin
學位類別:博士
校院名稱:國立臺灣大學
系所名稱:土木工程學研究所
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:1997
畢業學年度:85
語文別:中文
論文頁數:298
中文關鍵詞:空氣動力空氣彈力斜張橋顫振幾何非線性長跨橋梁
外文關鍵詞:aerodynamicsaeroelasticitycable-stayed bridgefluttergeometric nonlinearitylong-span bridge
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纜索支撐橋梁可分為吊橋、斜張橋及二者之混合式,三種橋型都是屬於
長跨度橋梁,其中吊橋與斜張橋是本文所要研究的重點,此類橋梁受風力
作用時,會產生複雜的氣彈互制,甚或造成氣彈力不穩定,危害到橋梁的
安全。本文首先對纜索支撐橋梁的理論演進作一詳細研究,且從遠至十七
世紀到二十世紀的理論演進中,檢討纜索支撐橋梁發展情形及其破壞主因
,其次,將探討風力與纜索支撐橋梁互制作用時產生的扭轉不穩定,以及
顫振、馳振等現象所引發的氣彈力不穩定。最後,結合氣動力理論與構架
穩定理論,建立一廣義的三維理論,以分析斜張橋之顫振不穩定。另外,
也建立了氣彈力回饋模式,來探討纜索支撐橋梁受靜態風力作用之氣彈力
穩定問題。
Cable-supported bridges such as suspension bridges and
cable-stayed bridges are lightand slender structures. When
excited by wind gust loads, these structures can fail
byaerodynamic instability, especially, in the form of flutter
instability. The flutterinstability is a self-excited
oscillatory motion, which is caused mainly by the self-
excitedaerodynamic forces induced by the fluid-structure
interaction, when a structure is exposedto air flows at critical
speeds. In response to the continuous build-up of the input
energy,the motion of the structure increases in amplitude and
becomes unstable. The purpose of thispaper is to establish a
general three-dimensional theory for analyzing the flutter
instabilityof cable-stayed bridges. The equation of motion for
the structure is transformed by the statespace method into a
characteristic equation, from which the eigenvalues solved are
usedto judge the aeroelastic stability. Major features of the
present theory include: (1) Thegeometric nonlinearities
associated with the main girders, pylons, and cables are all
takeninto account. (2) The joint equilibrium conditions
violated by traditional beam elements atthe deformed state are
enforced by using a rigid body-qualified beam element. (3)
Theinteraction between the fluid and structure is considered
through the flutter derivatives. Theresults computed herein are
shown to be rather accurate when compared with those obtainedby
other methods.
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