臺灣大學: 土木工程學研究所楊永斌尤豪文Yu, Hao-WenHao-WenYu2013-04-012018-07-092013-04-012018-07-092012http://ntur.lib.ntu.edu.tw//handle/246246/255435要對橋梁的損傷狀況做出合理的工程判斷，需準確獲得橋梁的動態參數，其中又以橋樑的自然頻率對整體勁度的影響最為重要。傳統量測橋梁頻率的方式為「橋頻直接量測法」，即直接從橋面上安裝的感應器擷取出橋梁頻率。而近年來，橋梁整體性的檢測技術快速發展，一種被稱為「橋頻間接量測法」的新方法被提出，其概念為利用一移動車輛通過橋梁，以其安裝在車體上的感應器，來記錄並間接擷取出橋梁頻率。與傳統的直接量測法相比較，橋頻間接量測法具有移動性、迅速性、經濟性等優勢，尤其在災後需針對大量橋梁進行安全檢測時，間接量測法將會是首選。 本研究的目的是利用實際試驗的方式，來改善試驗車體及相關儀器，而試驗結果顯示，這樣的車體改良方向是有效且正確的。另外，本論文亦考慮間接量測法對不同橋型之適用性，並針對現地試驗橋頻擷取影響最大之三個因素：試驗車重量、行進速度、橋上隨機車流量，進行試驗參數比較分析。最後統整結論於後，以供未來現地量測試驗及研究方向之參考。Before an assessment can be conducted on the damage level of the bridge, it is essential to obtain the dynamic parameters of the bridge, including particularly the natural frequencies of vibration. Traditionally, bridge frequencies are measured from the dynamic response of the bridge via the vibration sensors directly mounted on the bridge, referred to as the direct approach. In recent years, there has been a fast development on the bridge frequency techniques. One of these methods, called the indirect approach, has been proposed. The idea of this method is to obtain the bridge frequencies indirectly from the dynamic response recorded on a moving vehicle during its travel of the bridge of concern. Compared with the direct approach, the indirect approach has the advantage of portability, rapidness and economical efficiency. It is also the primary choice when encountering major natural disasters such as earthquakes, which requires safety examination over a vast amount of bridges in a short time. Through a series of field tests, the objective of this study is to improve the performance of the testing vehicles and related devices. The results indicate that the methods proposed by this research are both useful and effective. Moreover, this research also considers the feasibility of using the indirect approach to measure different types of bridges, focusing on the three main factors that affect the retrieval of bridge frequencies, i.e.,weight of the test vehicle, advancement speed and rate of random vehicle flow on the bridge. These data are then analytically compared. Concluding remarks are drawn at the end of this study to provide insight for future field tests and reference for further researches.6166254 bytesapplication/pdfen-US橋梁頻率橋頻間接量測法移動車輛現地試驗試驗車重量行進速度橋上隨機車流量bridge frequenciesindirect approach for measuring the bridge frequenciesmoving vehiclefield testweight of test vehicleadvancement speedrandom vehicle flow rate on the bridgethesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/255435/1/ntu-101-R99521241-1.pdf