碳鋼材料在大氣腐蝕環境的作用下，會發生腐蝕現象，削弱了結構的強度，進而造成整個結構系統上的危害。在以往腐蝕破壞的研究中，多半只是針對單一的失效模式進行分析探討，在此種情況下，各種失效破壞條件以一個經驗公式整合分析之或以一個極限狀態函數來描述之，對於整體結構的狀態並不能明確且完整的表現出受破壞的狀況。因此，為了更詳細的評估腐蝕對結構的破壞情況，本文在具有高度不確定性與複雜性的大氣腐蝕環境中，考慮二氧化硫與相對濕度對鋼橋腐蝕的影響，並加上靜載重與活載重對鋼橋破壞之評估，進而求得鋼橋系統失效機率，藉以充分代表整體構件的真實情況。
　　本研究的主要目的是針對鋼結構物在受大氣腐蝕前與腐蝕後，在不考慮疲勞影響的情況下，進行系統可靠度分析。其中是考慮極限強度與結構可靠度理論為基礎，再配合腐蝕模型之統計與系統可靠度方法來求得結構物的破壞機率，最後評估結構物腐蝕前與腐蝕後之系統可靠度。

　　As for Carbon steel materials, it often occurs corrosion which weakens construction state and it further damages to whole construction system under atmospheric corrosion environment. In the past research about corrosion destruction, most of them just analyze and discuss according to single failure mode. Under this situation, you just can use one limit state function to describe construction status or combine each failure destruction condition to analyze with one experience formula. But for whole construction status, it can not show destructive situation clearly.Thus, in order to evaluate the destructive situation of corrosion against construction clearly, this research makes searching system failure probability represent sufficiently real situation of whole construction under atmospheric corrosion environment with high complication, considering the effect of SO2 and relative humidity against steel corrosion, with evaluation of static load and live load against steel bridges destruction.
　　The main purpose of this research is to perform system reliability according to steel construction before and after atmospheric corrosion without considering tiredness effect. According to limit state consideration and structural reliability, matching with searching failure probability from system reliability and corrosion modes, it evaluates system reliability before and after corrosion finally.

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