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    題名: 碳纖維索斜張橋阻尼特性對地震反應影響之研究
    其他題名: A Study on Seismic Response Effects Relating to Damping Characteristics of Cable-Stayed Bridges with Carbon Fiber Composite Cables
    作者: 苟昌煥;高金盛;江坤霖;馬世瑋;蔡政霖
    貢獻者: 淡江大學土木工程學系
    關鍵詞: 斜張橋;纜索的局部振動;碳纖維索;地震反應;阻尼;cable-stayed bridge;local vibration of cables;carbon-fiber cable;seismic response;damping
    日期: 2007-09
    上傳時間: 2014-03-17 13:32:11 (UTC+8)
    出版者: 臺北縣淡水鎮 : 中國土木水利工程學會
    摘要: In large span cable-stayed bridges, self-vibration of cables covered a wide range due to unequal cable lengths in the system; coupled vibration is prone to occur when local vibration of a cable caused by the load of a vehicle, an earthquake, or the wind or rain resonates with the bridge system. Studies reveal that for carbon-fiber cable-stayed bridges, when calculating the strain proportioned damping, damping ratio of part of vibration modes will somehow be over-estimated if not taking the influence of local cable vibration into consideration; in a low proportion, though. Comparing with steel cable-stayed bridges, in a carbon-fiber cable-stayed bridge, whether or not considering the local vibrations has a more substantial effect on the damping distribution. Moreover, when using constant damping to calculate seismic reactions of a large span cable stayed bridge, more significant seismic reactions are often attained; therefore this is a more conservative analysis model. When using Rayleigh Damping theory to simulate damping characteristics, significant deviations in seismic reactions will occur due to different selection of referencing vibration modes.
    在跨徑較大的斜張橋中,長短不一的纜索體系所涵蓋的自振範圍很大,在車輛、地震或風雨荷載作用下,纜索的局部振動易與橋梁體系發生耦合振動的現象。研究結果顯示,碳纖維索斜張橋若不考慮纜索局部振動之影響,在計算應變能比例阻尼時將會些許高估部份振態之阻尼比,但比例並不大,而鋼索斜張橋與碳纖維索斜張橋相較,考慮及不纜索之局部振動,將對阻尼之分佈有著較大的差異。另外,當利用常數阻尼來計算大垮徑斜張橋地震反應時,往往可以得到較大的地震反應,屬於較為保守的分析模式;而當利用雷利阻尼理論來模擬其阻尼特性時,將會因選取的參考振態不同而產生極大的地震反應差異。
    關聯: 九十六年電子計算機於土木水利工程應用研討會論文集=Proceedings of 2007 Conference on Computer Application in civil & Hydraulic Engineering,頁477-482
    顯示於類別:[土木工程學系暨研究所] 會議論文

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