橋墩(Piers)為橋梁重要之組成構件，因長期暴露於外在環境，受人為破壞及天然災害的機率頻繁，劣化為無可避免的現象。因此橋墩劣化與其劣化因子間的分析與探討，為橋樑安全維護中一項重要之課題。失誤樹分析(FTA)為一種廣為工業界認同，可有效地分析失誤事件之因果關係與發生機率的技術。然而若因子中多具含糊性 (如人為錯誤)，則難以準確地估計出缺失發生的機率，而模糊失誤樹分析(FFTA)可解決此使用上之限制，評估出模糊事件的失誤率。鑑此，本研究利用模糊失誤樹來分析橋墩劣化之機率與各影響劣化因子之重要度，結果顯示橋墩位處之河川環境狀況，對於跨河橋橋墩劣化之影響最為直接且顯著。此研究成果可供橋梁管理相關單位擬定養護策略之參考，以達節省人力、物力及資源有效分配之目標。

The piers are essential components for a bridge. Due to its exposure to external environment, the possibilities of the damage by human beings or natural disasters could be increasing, which become inevitable situation. The bridge deterioration problem should be analyzed and deeply investigated in the study, which become one of the most important security issue in the maintenance for the risky bridges. Fault Tree Analysis (FTA), a widely recognized technique for industry safety, can effectivelyevaluate cause-and-effect relationship and accident probability. However, it’s difficult to accurately assess accidentprobability when factors are vague (such as human error), and Fuzzy Fault Tree Analysis(FFTA) can be used to cope with this problem., to assess accident probabilities.In the study, fuzzy fault-tree method was used to analyze the probability of bridge deterioration and the importance degree of other deterioration factors. The results are discovered that the river environment is significant influence toward the bridge deterioration. The study findings can be the reference for bridge management institution to plan related maintenance strategy. That could be achieving the goal of labor conservation, effective distribution of materials and resource

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