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斜拉索索力與動力反應 = Determination of Tensio...

國立高雄大學土木與環境工程學系碩士班

斜拉索索力與動力反應 = Determination of Tension Forces and Dynamic Responses of Stay Cables

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Determination of Tension Forces and Dynamic Responses of Stay Cables
作者:	羅聖智,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2010[民99]
面頁冊數:	79面圖，表 : 30公分;
標題:	斜張橋
標題:	artificial neural network
摘要註:	由於台灣位於地震帶，而目前很少有斜張橋於地震之中破壞的案例，斜張橋相對於其他橋梁結構的形式，具有美觀的優點，而探究斜張橋將更能深入了解斜拉索的重要性，因此斜拉索動力特性的探討，對斜張橋而言有絕對之必要性。本文的目的為建立纜索模型並進行動力分析，纜索振動行為屬於時變的問題，本文將纜索獨立討論，並使用以有限元素法為基礎理論的分析軟體進行模型建置與分析。以高屏溪斜張橋為例，應用有限元素軟體Sap2000建立斜拉索結構模型，可執行結構靜力、頻率振態及線性動力反應等分析工作。(1). 首先進行靜力分析，求得不同預力下的自然頻率，發現有限元素纜索模型模擬已足夠描述纜索之特性；在張緊的纜索線形上利用拋物線理論亦已經足夠描述其斜拉索線形。(2). 在不封閉橋梁情況下，可使用微動試驗求得鋼纜自然頻率，倘若能以纜索自然頻率直接求得索力和中垂量是非常經濟方便的，故以類神經網路來預測實場時的纜索預力以便工程上應用，未來也可依此應用於評估橋面版主梁損傷定位的程度。(3). 最後將纜索模型加載風力荷載來求取結構物之反應情形，發現纜索受側風影響下，從頻譜圖可以看出風在纜索上的振動往往包含了許多模態，這結果將可作為纜索風致振動之研究導向。 Cable-stayed bridges have become more and more popular in modern society due to their strong functionality and aesthetically appealing solution. In order to increase span, the addition of cable system makes the bridge more flexible and prone to vibrate under environmental and service loading such as wind, rain, traffic, and earthquake. The effects lead to significant dynamic phenomena. In particular, high amplitude localized oscillations can arise in the stay cable. The stay cable is very low-damped and flexible due to their length. Hence local vibrations of stay cables may be excited and are of critical importance from the safety point of view. In this work, an artificial neural-network-based algorithm (ANN) is offered to determine the tension forces of stay cables in cable-stayed bridge. Firstly, a database of cable forces is calculated from based on final element model of an axially loaded cable that considers the major nonlinearities of the inclined cables results from the sag effect. Then, these limited sets of database are employed as input/output data to establish a prediction ANN frame model to further predict the cable forces for other stay cable without conducting additional information of the unstrained length of cable. The results presented indicate that this ANN prediction scheme works reasonably well. Therefore, instead of solving a nonlinear characteristic equation by trial-and-error as such additional geometric information of cable is often not available in practice. Finally, the ANN approach is used to determine the cable forces of the Kao Ping Hsi cable-stayed bridge. The results obtained herein indicate that such ANN analysis is valid and rational, and may be used to monitor the safety of stay cable. Besides, an analytical procedure in the time domain can be employed to determine the dynamic response of the stay cable under wind loads. The results showed the time domain method is applicable to dynamic analyses of stay cable under wind loads.

斜拉索索力與動力反應 = Determination of Tension Forces and Dynamic Responses of Stay Cables
羅, 聖智

斜拉索索力與動力反應 = Determination of Tension Forces and Dynamic Responses of Stay Cables / 羅聖智撰 - [高雄市] : 撰者, 2010[民99]. - 79面 ; 圖，表 ; 30公分.
參考書目：面39-43.
斜張橋artificial neural network

斜拉索索力與動力反應 = Determination of Tension Forces and Dynamic Responses of Stay Cables
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