本文將利用現地實驗去研究橋梁之動態行為，該高架橋為高雄港之聯外道路，其裝設鉛心橡膠支承墊作為隔震系統，利用MK-155U 離心質量機系統來對橋梁產生搖動，藉此探討橋梁之動態行為，該系統可以藉由改變旋轉頻率來達成不同的外力輸出，而這次的實驗主要是使用1.6~7.5Hz的旋轉頻率以及搭配不同數量之質量塊來進行測試。在測試的同時也在橋梁上安裝量測系統，利用加速度計和線性可差分變壓器(LVDT)來量測橋梁之加速度和位移。

為了找到橋梁之自然振動頻率和隔震系統的效能，將會針對橋面和橋墩之位移和加速度進行分析，兩者加速度之差異將可以顯示出LRB隔震系統的效能，最後也會依橋梁在微震或是強制振動的情況下，進行自然頻率和隔震效能的比對與討論。

This study investigates the dynamic behavior of the bridge with lead-rubber bearings using field experiments, in which the MK-155U Eccentric Mass Vibrator System was used to shake the bridge. The vibrator system can change the rotation frequency so that the external force can be adjusted. The dynamic behavior of bridge were observed by changing the frequencies 1.6 Hz to 7.5 Hz and using various mass plates. In the same time the accelerometers and LVDT were installed in different positions of the bridge, where the acceleration and displacements were measured.
In order to find out the bridge natural frequency and the LRB efficiency, the displacements and acceleration of deck were evaluated. The different acceleration between the deck and pier shows that the isolation effectiveness of LRB, and this study also compared the natural frequency and isolation effectiveness of the micro and force vibrations.

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