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題名 | Variability of Dynamic Characteristics of a Cable-Stayed Bridge Subject to Traffic-Induced Vibrations=斜張橋受車致振動之動力特性變化 |
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作者姓名(中文) | 陳振華; 林堉溢; 楊順欽; | 書刊名 | 中正嶺學報 |
卷期 | 39:2(A) 2010.11[民99.11] |
頁次 | 頁47-56 |
分類號 | 441.86 |
關鍵詞 | 斜張橋; 動力特性; 結構監測; 車流振動; 系統識別; Cable-stayed bridge; Dynamic characteristics; Structural monitoring; Traffic-induced vibration; |
語文 | 英文(English) |
中文摘要 | 斜張橋由於輕質柔軟之特性,在營運階段承受的車流與風力作用下,引致的振動反應遠比其他類型橋梁明顯,此對斜張橋安全具有某種程度之威脅,尤其是對纜索元件可能造成直接之疲勞損傷。本文主要是利用動態監測系統,針對南部第二高速公路高屏溪斜張橋進行現地長期動態反應監測,並統計尖峰車流與離峰車流作用下之動力反應變化。同時,斜張橋的動態反應可進一步利用系統識別的方法求得斜張橋的動力特性參數,探討斜張橋在不同車流作用下之動力參數變化情形。由本文之研究結果可知,斜張橋在不同車流作用下,自然頻率變化並不明顯,但對於各振態阻尼比則有較明顯之改變,此一結果將有利於未來斜張橋之安全監測之參考。 |
英文摘要 | Due to large flexibility in cable-stayed bridges, vibrations induced by traffic and wind loads are more significant than those in other types of bridges. These vibrations may cause structural damage, such as fatigue in stay cables. The objective of this paper is to investigate dynamic characteristics of the Kao Ping Hsi cable-stayed bridge subjected to different traffic conditions. Experimental data were measured from a structural monitoring system installed upon this bridge. The techniques of system identification, including random decrement (RD) technique and Ibrahim time-domain (ITD) identification, were used to analyze the experimental data. The first eleven modes of the bridge were identified in three main directions. Then, the traffic induced variations in dynamic characteristics of Kao Ping Hsi cable-stayed bridge can be evaluated in the torsional modes. The results indicated that the traffic flow would not significantly change the natural frequencies of the cable-stayed bridge. However, the damping ratios are sensitive to the vibration intensity. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。