近海之鋼筋混凝土構架常有鋼筋腐蝕劣化之情況，若鋼筋混凝土中之鋼筋受氯離子滲透而腐蝕時，將導致混凝土與鋼筋之間之握裹力下降，進而產生握裹滑移現象，此現象將改變原有結構物之破壞模式，從韌性破壞轉變成剪力破壞或握裹破壞，破壞模式的改變將影響結構體的耐震性能，使得結構物無法承受其原始設計地震，因而產生安全上的疑慮。本研究使用一雙層兩跨之鋼筋混凝土試體，評估鋼筋腐蝕對鋼筋混凝土結構破壞模式及耐震行為之影響，使用有線元素分析軟體模擬結構體受側推及地震力之反應，調查各種腐蝕程度對結構物耐震能力之影響，此外，使用非線性靜力側推分析取得結構物之側推行為，利用側推分析以建立FEMA-356性能評估法，並與非線性動態分析結果比較，評估FEMA-356性能評估法之可靠性。;The offshore reinforced concrete (RC) structures often suffer from the deterioration of steel corrosion. When steel rebar is penetrated by chloride, it will progressively degrade. This degradation leads to the decreasing bonding strength between concrete and steel, reduction of the rebar cross area, and the splitting of concrete cover. The corroded steel bars affect not only the load bearing capacity of a RC structure, but also the failure mechanism, leading to a more brittle behavior. The study investigates the effect of reinforcement corrosion on the behavior of a RC frame structure. A prototype two-story two-span RC frame is designed and its earthquake behavior is investigated. The earthquake behavior is predicted using nonlinear pushover analysis and transient analysis. In addition, the behavior of the corroded RC structure is also evaluated using the criteria specified in FEMA-356.. The evaluation results are compared with those obtained using nonlinear dynamic analysis to assess the feasibility of FEMA -356 for corroded RC structures.
