目前國內橋梁目視檢測主要採用DER&U之評估法，即以橋梁構件之損害程度(D)、損害範圍(E)、與橋梁安全相關性(R)，以及維修急迫性(U)來計算並判定橋梁之狀況。國內目前有一般混凝土橋梁與鋼橋之檢測評估標準，但在桁架橋方面仍付之闕如。現行的桁架橋檢測，只能以備註的方式填寫在一般橋梁的檢測表單，故一般的橋梁檢測指標，並無法顯示桁架橋的實際狀況。 本研究以DER&U評估法為基礎，將桁架橋進行構件分類後，透過專家訪談及問卷調查，建立桁架橋各構件之檢測評估標準與權重後，即可依一般橋梁狀況指標計算並判定整體橋梁之狀況。此外，因桁架橋構件眾多且多位於高處，檢測不易，使用橋檢車檢測則費用甚高且調度不易，故本研究研發長桿檢測工具以輔助目視檢測，可增加檢測效率並降低檢測之成本。最後，本研究亦探討使用此長桿檢測工具於水下檢測橋梁之可行性。;Currently, bridges in Taiwan are inspected visually and evaluated by the DER&U methodology. In the methodology, condition of the a bridge is determined by a weighted calculation of bridge components with four indices; i.e., degree of deterioration (D), extent of the deterioration (E), relevancy to bridge safety (R), and urgency to repair (U). The DER&U methodology has been applied to concrete and steel bridges but not to truss bridges. Traditionally, inspection results of truss bridges are only stored in the comment field, thus the condition of the truss bridge cannot be shown correctly. Based on the DER&U methodology, this study firstly categorized various components of a truss bridge and then obtained evaluation standards and weights for calculation of these components from experts and questionnaire surveys. Thus, condition of a truss bridge can be calculated as other types of bridges. As such, comparisons among bridge conditions become possible and reasonable. In addition, since inspection trucks are rare and inspection costs are expensive, inspection of the truss bridge is a tough task due to its numerous truss components. To improve the efficiency and decrease the cost of inspection, this study also developed a long rod inspection tool. Finally, feasibility of underwater inspection of bridge components is also explored in this study.
