橋梁隨著時間所累積的損傷日益漸增，維護補強的課題開始受到重視，在決定哪座橋梁必需先維護補強時，事前的檢測評估這項前置作業就顯得更為重要。目前國內主要是採用D.E.R.&U.目視檢測法來評估，橋梁現況之檢測評估的判定較為主觀，不同工程人員之判定結果會有所差異，為使現場檢測的工程人員有所依據，必需藉由教育訓練來降低差異性。在一定的週期內對橋梁各構件進行檢測，可以提早發現問題且了解實際情況且立即採取措施，讓橋梁保持在最佳狀態。
目前D.E.R.&U.目視檢測教育訓練課程不外乎是介紹規範內容和一些劣化樣態的照片分享，以冗長文字的方式來描述橋梁劣化和損害的狀況，不僅難以具體地呈現實際的情形，且多半沉悶乏味，導致學習力下降，學員更是難以想像各構件劣化的程度到底有多嚴重。就算是搭配圖片來呈現劣化狀況，難以兼顧各種細節，學員無法根據本身檢測上的需求來改變目視點及目視角度，缺乏需求上的自由度及彈性。
本研究擬使用虛擬實境的技術建置影像式虛擬實境系統，並且透過視角的移動和轉動，讓使用者可以體驗親臨橋梁的現場真實感。另外歸納整理出D.E.R.&U.目視檢測所有劣化樣態，並整理出構件項目和劣化樣態、劣化樣態和評估準則兩者之詳細對應矩陣，利用矩陣之對照功能使檢測人員在橋梁檢測時可以更有效率的評估檢測橋梁劣化的問題，如果在後續規範有變更或增減的狀況也可以藉由矩陣快速變更。結合D.E.R.&U.目視檢測規範，依據使用者本身想參考之檢測項目來做表格的點選，達到具有真實感且有互動性的教育訓練系統。

While the damage of bridge accumulated over time is increasing, the issue of maintenance and reinforcement has begun to receive attention. The pre-operation of evaluation to decide which bridge should be maintained and reinforced first is even more important. At present, the D.E.R.&U. visual inspection method to evaluate is more popular in Taiwan. The assessment of bridge status is more subjective and the judgment results of different engineers might be different. In order to make the on-site inspection has a common basis, the engineers should be educated and trained to reduce difference. Testing the components of bridge periodically can detect the problem earlier, understand the actual situation and take immediate measures to keep the bridge in a best condition.
At present, the education and training course of D.E.R.&U. visual inspection is nothing more than introducing the normative content and some degraded photo sharing. It describes the deterioration and damage of bridge by lengthy text. It is not only difficult to specify the actual situation, but also boring to understand. It leads to a decline in learning ability because it is difficult for students to imagine how serious the deterioration of each component is. Even if it is accompanied by pictures, it is difficult to take into account for various details. Students can't change the visual point and angle to evaluate according to lack the freedom and flexibility of demand.
This study intends to use the virtual reality technology to build a virtual reality image system. By ways of the movement and rotation of perspective, users can experience the actual situation of the on-site bridge. In addition, all the deterioration patterns of D.E.R.&U. visual detection are sorted out the detailed correspondence matrix of component items versus deterioration states and deterioration states versus evaluation criteria. The comparison function of matrix is used to enable the inspectors to detect the bridge more efficiently. Assessment of bridge degradation problem can be quickly changed by matrix if there are changes, increases or decreases in subsequent specifications. In combination with the D.E.R.&U. visual inspection specification, the selection of the form is based on the test items that the user wants to refer to achieve a realistic and interactive educational training system.

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