本研究以實驗為主，配合理論分析和數值模擬探討車橋互制問題中一些重要物理現象。於實驗室建立一模型橋梁及包含一系懸掛裝置的軌道滑車，量測滑車在不同行駛速度下橋體之加速度、變位、應變及車體的加速度反應，並探討滑車在不同速度下通過不同位置梯坡道(Ramp)時對橋梁的衝擊效應，以車橋之間在不同車速下之共振行為。為獲取使用商用數值模擬軟體分析車橋互制行為之經驗，特以套裝軟體LS-DYNA建立車-橋互制行為的動力分析數值模型，並且以量測結果來修正數值模型之參數。研究結果顯示，以LS-DYNA來模擬車橋互制行為可得到不錯的模擬效果。 In this paper, the bridge- vehicle interaction problem is studied by experimental and numerical methods. A reduced steel box girder bridge model of 5m long and 0.6 m wide and a model vehicle were made to conduct the measurements of bridge-vehicle interaction behaviors. The dynamic characters of the bridge and vehicle were identified first. These data together with the experimental measurements were used to calibrate the numerical simulation model. The strain, deflection and acceleration at some locations of the model bridge under various moving speeds of the vehicle were measured. The resonance effect between the bridge and vehicle at various moving speeds were also investigated. Besides, the impact response of the bridge due to the vehicle moving across ramps at various locations of the bridge deck was also studied. To have some experience on applying commercial code to simulate the bridge-vehicle behavior, the LS-DYNA code was applied to study the interaction dynamics between the bridge and moving vehicle. Numerical results reveal the LS-DYNA code can well simulate the dynamic performance measured through the experiments.