本論文主要目的在利用數位相機發展自動、準確和非接觸的變位量測方法。 為了發展此系統，本論文採用比對影像相關性之理論,撰寫電腦程式可以由試體受力變形前和變形後之影像推算物體表面之變位。並使用兩種不同之方法進行量測。實驗之一是利用試體表面黏貼基準點並結合開發之電腦程式量測簡支梁受集中荷載之後之變位,進而利用變位資料求得剪力、彎矩分布。第二個實驗則利用新開發之比對影像相關性技術量測鋼構架之變位、並利用變位資料搭配最小二乘法推算剪力、彎矩分布。這些實驗值分別和解析解及有限元素分析之結果分析比對,結果顯示十分吻合。

This thesis developed an automatic, accurate, and noncontact method that used video camera to measure displacement on surface of object. In order to develop the system, the theory of the digital image-correlation method has been applied. A computer program based on this correlation method was developed for the determination of the displacement due to the deformation of the image. There are two kinds of experiments which use different methods to measure displacements. One is the applied symbol dot method to obtain deflection, shear force and moment on simply supported beam. The other was the applied digital image correlation method to measure deflection, shear force and moment of steel frame. The accuracy of measurement results was validated by a simply supported beam subjected to a concentrated force using the theoretical equation and finite element method.

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