鋼筋混凝土結構物現況安全評估所須的分析參數，主要是根據鋼筋混凝土的劣化狀況，以及竣工資料，若無法取得這些參數，就必須另以非破壞檢測方式推估，來提昇評估精度。結構物承載能力的評估，和拉力區鋼筋強度有直接關係，而與混凝土的中性化、氯離子含量並無太直接關連。甚至混凝土的抗壓強度與整體結構物之抗彎、抗剪、握持能力、彈性模數等亦只有平方根的關聯。因此混凝土材質檢驗，或許只能提供劣化潛勢研判，某些可以不必要的檢測項目，目前卻一直廣被使用於安全評估，應有再探討空間。鋼筋強度是為RC 結構，在安全評估中的最重要關鍵參數，而目前能取得上述參數的非破壞檢測方法並不多見，甚至也有一些困難。因此，本文應用金相組織試驗理論於實驗室中建立鋼筋抗拉強度及里氏硬度之相應關係曲線，此法特色為，可直接於檢測現場以鋼筋硬度試驗換算成鋼筋強度，解決目前結構物評估時無法取得鋼筋降伏強度的窘境。The evaluation on the safety of Reinforced Concrete structures requiresanalysis parameters. Predominately, this is in accordance with the deteriorationstate of the Reinforced Concrete. If parameters are not available uponconstruction, then non-destructive testing (NDT) must be used.It is thought that the loading capacity of the Reinforced concretestructural has a direct relationship with the strength of tension steels. Howeverthe neutralization of the concrete and the chloride ion content bare no directrelationships. In addition there is only a square root relationship between theentire structure and the bending, shearing, carrying capacity and the elasticityparameter of the structure. As such, inspections on the concrete quality mayonly yield the degradation potential with some inspection items unnecessary.Currently however this has been widely used in safety evaluations. This shouldbe reevaluated in the analysis.The most important parameters for evaluating reinforced concretestructure safety are the steel strength. Currently, NDT methods in obtainingthese parameters are rare. Therefore, this paper has applied the metallographictheory and used laboratory testing in determining the correspondingrelationship between the steel pulling strength and the Leeb hardness. Thecharacteristic of this method is that the steel hardness value can bemathematically converted to steel strength. This can be performed on-site andsolves the dilemma of the inability to obtain the steel strength whenundertaking a structural evaluation.
