本研究提供一估算橋梁補強效益評估方式；補強橋梁可以減少橋梁在受到災害時導致的損失，其損失來自於修補橋梁費用與無法依正常額定交通容量使用橋梁，造成用路人需增加額外成本以達到原本之目的。於計算補強效益時，首先必須先知道橋梁面對災害時可能發生之損傷機率，本研究在定義損傷等級時，除原本橋柱耐震性能外，亦加入了元件或構件檢核，檢核項目依據補強手冊之檢核項目如：防落長度、支承剪力、基礎拉拔力等，希望能更符合真實橋梁的受損狀態，因此每一個損傷等級皆是由多個檢核項目決定，其損傷發生機率需要以系統可靠度方法運算。本研究亦考量不同損傷狀態修復時之性能回復，以反映補修時程中之交通容量變化而計算其對應之社會成本，其中社會成本乃是因橋梁交通容量減少，導致車輛需繞道與車速降低所衍生。故本研究以益本比計算補強效益時，將考慮功能性提升對效益之影響，並以益本比決定補強效益高低與成本回收年限，最後本研究選定兩座台北市兩座橋梁進行評估。

This study is doing research about retrofitting benefit of bridge. Retrofitting bridge can reduce loss that form the cost of retrofitting bridge and can’t use bridge lead road users have to pay extra costs to reach original purpose. When calculating benefit of retrofitting bridge, first thing is finding damage probability of bridge facingdisaster.In present, defined damage level don’t consider damage situation of element or member, so we hope accord real damage situation that initiation element or member the test items of element or member like: the available seat width and support shear stress etc.Because each damage level is defined by multiple test items, damage probability of occurrence is calculated by system reliability. This paper consider different damage decrease level correspond different resilience that respond varied traffic capacity. Calculating society cost need to consider resilience. Society cost respond decrease in traffic capacity lead to traffic detour and reduce speed. So calculating benefit-cost ratio functional is considered in this research. And estimating cost recovery period decide bridge management division.In this paper we choose two bridge loctation in Taipei to do assessment.

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