台灣地形複雜，面積不大，高山密布，主要山脈分佈縱貫全台，為了跨越這些複雜的地形，建造了許多道路橋梁提供順暢的交通網路。而國內多數的公路橋梁，面臨損壞或劣化等問題，需藉由橋梁管理系統施以生命週期的維護管理，橋梁的維護規劃需在有限經費狀況下擬定最佳維護策略，使得構件能維持良好安全狀況，達到經費運用最有效率以及安全最高的目標。因此需計畫合適的橋樑維護策略，在有限或者最低的預算之下，維持橋梁狀況指標高於安全標準之上。
為求解更適當的維護策略，本研究應用Lai and Hwang (1992)提出之模式，求解多目標橋梁模糊最佳化維護策略模式，其多目標分別為「最小化維護總成本」、「最大化橋梁之狀況指標值」以及「最小化共同維護次數」，「最小化維護成本」目標式用於尋找花費最小且橋梁構件狀況值仍大於安全門檻之維護策略；「最大化狀況指標值」目標式用於尋找可保持橋梁構件遠高於安全門檻之維護策略，使得橋梁有最高的安全性；「最小化共同維護次數」用於尋找橋梁共同維護次數最小之維護策略，本研究將針對以上目標提出最佳化模式，並針對不同的目標組合進行模擬試算。

It is terrain in Taiwan, and there are many high mountains in the small island.In order to cross these complex terrain, there were many roads and bridges had been built to provide a smooth transport network.But the majority of domestic highway bridges, faced with issues such as damage or deterioration. They have to be taken care by the bridge management system life cycle maintenance.So we have make a good maintenance strategies that keeps bridge in good safety situation and using bridge maintenance budget effectively, and build effective bridge maintenance optimization model is the best way to solve the problem.
The research proposed a bridge fuzzy multi-objective optimization model,and it used the method of resolving angle ambiguity proposed by
Lai and Hwang (1992).Those objectives are “minimize rehabilitation cost in service period”, “maximize bridge condition index in service period” and “minimize concurrent maintenance times in service period”. The first objective “minimize rehabilitation cost in service period” used to find rehabilitation strategies combinations that costs minimize rehabilitation cost and keeps the bridge components index higher than safety level. The second objective “maximize bridge condition index in service period” used to find a rehabilitation strategies combinations that make bridge components in high safety situation.The third objective “minimize concurrent maintenance times in service period” used to find rehabilitation combinations that has less effective with users and minimize user cost.

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