目前常見的橋梁特性辨識方法包括車載量測、靜力加載與自由震盪試驗，亦可搭配有限元素分析軟體進行數值模擬，以獲得完整的結構反應資訊。本文利用靜力加載與自由震盪試驗配合數值模型，探討臨時便橋的動態行為。透過靜力加載試驗可觀察實際臨時便橋的變形模式與勁度分佈，透過橋體勁度進而推估其動態性質。自由震盪所得之位移與加速度歷時，經傅立葉轉換後可獲得實際便橋之模態頻率，作為靜力推估法之驗證依據。最後，利用 SAP2000 建立橋梁數值模型，並透過靜力加載實驗之位移結果調整數值模型參數，使數值模型靜力變形行為更貼近實際橋體情況，並確認數值模形之模態特性符合自由震盪實驗識別結果，從而提升後續進行結構控制或安全評估時的準確性與可靠度。

Common techniques for identifying bridge characteristics include vehicle-based measurements, static loading tests, and free vibration tests, often complemented by finite element simulations to obtain comprehensive structural response data. This study investigates the dynamic behavior of a temporary bridge using a combination of static loading and free vibration tests along with numerical modeling. The static loading test captures the deformation pattern and stiffness distribution of the actual bridge, which serves as a basis for estimating its dynamic properties. The displacement and acceleration time histories obtained from the free vibration test are transformed using Fourier transform to extract modal frequencies, which are used to validate the estimations derived from the static approach. Finally, a numerical bridge model is developed using SAP2000, and its parameters are refined based on experimental results to better reflect the real deformation behavior, thereby improving the accuracy and reliability of structural control and safety assessments.

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