近年來隨著建築材料及工法日益進步，質量輕且跨度長的橋梁結構愈形普遍，尤其以懸索橋或斜張橋為主的跨海大橋相繼在許多國家出現。但此類橋梁之受風反應卻相對敏感，因此裝設減振裝置如調頻液柱阻尼器(Tuned Liquid Column Damper，TLCD)有其必要性。目前TLCD之應用大多集中於建築物，甚少有橋梁上之應用，若將其運用於橋面板扭轉向之制振行為，則需考慮TLCD與結構扭轉向互制行為之運動方程式。本論文考慮受風之單自由度結構裝設非等斷面TLCD，以能量法進行基本理論推導，結果顯示存在一修正項為前人文獻所忽略。為釐清該修正項之重要性，本研究建構大尺度結構與TLCD進行驗證，首先以自由振動及強制振動方式分別進行結構與TLCD元件之識別，然後再以強制振動方式進行TLCD與結構互制之反應量測，與考慮修正項之理論式進行比較。實驗結果顯示，考慮修正項時所得到之理論分析結果較接近實驗結果，因此互制運動方程式的確須考慮此修正項。 Wind-induced interaction between a tuned liquid column damper (TLCD) and a bridge deck in pitching motion is investigated both theoretically and experimentally. Non-uniform cross-sections in TLCDs are considered in general. Theoretically, the interacted equations of motion under wind excitation were derived for a single-degree-of-freedom rotational structure equipped with a TLCD based on energy principles. An addition term, which had never been revealed in existing literature, was discovered. The second part in this study was to demonstrate the existence of this additional term through experimental verification. This task was carried out by conducting large scale tests on the system of a TLCD on a rotational structure (which is a spring-constrained steel beam pivoted at mid-span) and by making comparisons between the experimental and analytical responses of the interacted structure subjected to harmonic loading. To obtain all necessary parameters for computing the analytical responses in the interaction, the individual identification of the properties of the TLCD and structure using free vibration and forced vibration techniques was also performed. Comparison results show that analytical responses with the additional term included can represent the actual interaction more closely than those without the additional term. Therefore, the inclusion of the additional term in pitching interaction equations is essential.
Relation:
中華民國第九屆結構工程研討會論文集=Proceedings of The 9th National Conference on Structure Engineering，10頁
