位移之量測是土木結構檢監測中一個重要的項目，也是許多安全性評估的依據之一。在地震或洪水等巨大災害發生之後，道路橋梁的毀損會使許多人的生活受到影響，而恢復的過程經常是視這些重要建設的毀損情況而定，可能有些是全毀、有些為半毀損，對僅部份受到損害之公共建設的安全性與使用性做出正確的判斷是讓社會大眾快速恢復正常運作的關鍵，因此迫切需要一個健全可靠且有效的非破壞量測與評估技術。本論文係運用數位影像分析程式定出結構體上特定覘標的座標，以非接觸、遠距之方式計算標點之位移，並結合可扣除剛體位移的向量式有限元分析(Vector Form Intrinsic Finite Element，VFIFE)，由影像量測所得之標點位移資料計算出結構局部區域之應變，發展一個非接觸、遠距計算應變分佈的方法。本研究以簡支梁與懸臂梁試體進行位移與應變量測之驗證與實驗，並探討現地實際應用的可行性。

Displacement measurement is an important item of the health monitoring and performance evaluation of civil infrastructures. After a catastrophic earthquake or flood, large number of the population will be dislocated. The recovery processes are usually hampered by the numerous damaged civil infrastructures, some are totally and others are partially. Therefore, it is critical to determine the safety of the partially damaged infrastructures so that the society could regain their use and could help a speedy return to normalcy. Thus, there is an urgent need for reliable, robust and effective non-destructive evaluation techniques. In this thesis, digital image analysis processing is applied to position coordinates of the specific targets on a structure and to calculate displacement field. In addition, Vector Form Intrinsic Finite Element (VFIFE) Method which can remove the rigid body motion components in deformation analysis is applied to calculate the strain field of local region of a structure according to the displacement data measured by image analysis procedure. These two methods are combined to develop a non-contact and remote measurement method of strain field. Experiments of a simply-supported beam and a cantilever beam were conducted to verify and validate the proposed measurement and analysis techniques.

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