本研究以實驗為主，配合數值模擬探討車橋互制問題，以及軌道有微小平滑不平整時的物理現象。在實驗室建立一安裝軌道的模型橋梁和包含一懸吊裝置的滑車，量測滑車在不同行駛下速度，橋梁速度和位移反應，以及車體速度和加速度反應。並且讓軌道有一垂向不平整，探討不同重量的滑車經過此一不平整時，對車體還有橋梁的振動反應。並且搭配商用數值軟體LS-DYNA建立車-橋互制行為的動力分析模型，並且考慮輪軌接觸，將其結果與實驗數據做核對，改進模型的建立。研究結果顯示，以LS-DYNA來模擬軌道垂向平滑不平整的行為，可以得到不錯的結果，可以繼續朝向對軌道水平向不平整的探討。 In this thesis, the vehicle-bridge interaction problem with small and smooth track irregularity in vertical direction is studied by experimental and numerical analyses. The experimental structure is set up in the laboratory, including a bridge model with tracks and a car model with suspension system. The velocity and deformation of the bridge model and velocity and acceleration of the car model are measured when the car model passes in different velocities through the bridge structure. The dynamic responses in the all models were also measured when the car model in several different weights passed though the bridge model with a vertical irregularity; and the numerical model included wheel/track contact was established by LS-DYNA code. The results from experiments are compared with the results of numerical analyses. Numerical results reveal that the LS-DYNA can simulate well the dynamic performance measured from the experiment. The dynamic performance of the car passing a lateral irregularity should be carried on in the future study.
