本研究針對兩座橋型，斜張橋、箱型梁高架橋之梁體進行現地振動檢測，擷 取現地振動訊號，並應用希爾伯特黃轉換法來進行分析，藉以處理非線性、非穩 態訊號，通過間斷性準則淨化萃取所須之真實振動訊號、正交指數相關性之檢核， 增加經驗模態訊號分解結果的準確性，並透過希爾伯特頻譜圖中，時間、速度、 距離之轉換，進而有效、快速的來判斷橋梁梁體結構系統損傷的初步位置，最終 配合現場查核驗證，準確、穩定的確認梁體損傷位置，使管理單位能夠迅速瞭解 橋梁現況。

This study conducted in-situ vibration tests on the beam bodies of two types of bridges, namely, cable stayed bridge and box girder viaduct, to collect the in-situ vibration signals, which are analyzed by using the Hilbert-Huang Transform method. The nonlinear and non-stationary signals can be processed to purify and extract the real vibration signals needed through the intermittency criterion. The orthogonal index correlation check increases the accuracy of the empirical mode signal decomposition results. Moreover, the damage locations in the bridge beam body structure system could be decided in an effective and fast manner preliminarily through the time, speed and distance transformation in the Hilbert spectrum diagram. Finally, the beam body damage locations are confirmed in an accurate and stable manner in cooperation with the on-site inspection and verification so that the management authorities can quickly determine the bridge conditions.