楊永斌2006-07-252018-07-092006-07-252018-07-092006http://ntur.lib.ntu.edu.tw//handle/246246/2895本計畫只在研究移動車輛和承載橋梁 間之動力互制，假定車輛/橋梁之質量比為 很小時，採用振態疊加法，可以求得橋梁 和移動車輛的近似（但極為精準）的垂直 振動反應，經過比較後，證實只考慮橋梁 第一個振態所得的振動反應，不論是車輛 或橋梁，都相當準確。 橋梁的位移、速度、 和加速度是由不同範圍的兩組頻率所控 制，即車子的驅動頻率和橋梁的振動頻 率。從橋梁位移的反應譜可知，車子速度 與某些低頻尖峰有關。另方面，車子的反 應是由五種不同的頻率所控制，也就是驅 動頻率、車子頻率、以及平移過的橋梁頻 率。從車子的加速度反應譜可知，橋梁的 第一個頻率（平移過的）有很高的可見度， 因此可以很容易被鑑別出來。有關本研究 的可能應用，以及未來的研究方向，都是 本報告關心的重點。The dynamic interaction between a moving vehicle and the sustaining bridge is studied in this project. By the method of modal superposition, approximate but highly accurate closed-form solutions are obtained for the vertical responses of both the bridge and moving vehicle, assuming the vehicle/bridge mass ratio to be small. For both the bridge and vehicle responses, it is confirmed that rather accurate solutions can be obtained by considering only the first mode. The displacement, velocity, and acceleration of the bridge are governed at different extents by two frequency sets pertaining to the driving frequency of the vehicle and natural frequencies of the bridge. From the spectrum for the bridge displacement, the vehicle speeds can be shown to be associated with some low-frequency pikes. On the other hand, the vehicle responses are governed by five distinct frequencies that appear as driving frequencies, vehicle frequency, and bridge frequencies with shift. From the vehicle’s acceleration spectrum, the first bridge frequency (with shift) is shown to have rather high visibility and can be easily identified. Potential applications of the present results, as well as further researches required, are also indicated in the project.application/pdf386622 bytesapplication/pdfzh-TW國立臺灣大學土木工程學系暨研究所橋梁頻率頻率量測車─橋互制動力移動車輛BridgeFrequencyFrequency MeasurementVehicle-Bridge Interaction DynamicsMoving Vehiclereporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/2895/1/932211E002046.pdf