考慮系統功能影響之橋梁補強工程效益研究

BENEFIT-COST ANALYSIS OF SEISMIC RETROFIT FOR BRIDGES CONSIDERING SYSTEM FUNCTIONS

10.6652/JoCICHE.201712_29(4).0001

邱建國(Chien-Kuo Chiu)；宋裕祺(Yu-Chi Sung)；劉光晏(Kuang-Yen Liu)；程瑞忠(Ruei-Chung Cheng)；陳柏湧(Bo-Yong Chen)

系統可靠度 ； 回復性能 ； 社會成本 ； 益本比 ； 耐震補強 ； 橋梁 ； system reliability ； seismic retrofit ； bridge ； social cost ； benefit-cost ratio

中國土木水利工程學刊

29卷4期（2017 / 12 / 01）

211 - 225

繁體中文

計算橋梁補強效益時，首先了解橋梁面對災害時之損傷機率，本研究於定義損傷等級時，除原本橋柱耐震性能外，亦加入元件或構件檢核，檢核項目依補強規範建議如：防落長度、支承剪力、基礎拉拔力等，因此各損傷等級皆由數個檢核項目決定，其損傷發生機率需以系統可靠度方法進行運算。本研究亦考量不同損傷狀態修復時之功能回復，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。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，最後進行案例研究以了解本方法之實用性。

For the benefit evaluation of the seismic retrofit of a bridge, how to estimate the occurrence probabilities of various damage states is needed at first. Generally, for a bridge structure, the performance curve obtained from the pushover analysis, which represents the seismic performance of piers, is used to define the various damage states of the bridge under earthquake. However, the damage states of components or elements, such as the bearing, prevention device of bridge falling, cap beam, and foundations are not considered to define the various states of the bridge. Therefore, each damage state of a bridge structure should be defined based on the performance functions of components or elements. Additionally, this paper adopts the system reliability method to estimate the occurrence probabilities of each damage state of a bridge structure including damage states of specified components or members. For the social cost within the seismic retrofit, this work adopts various recovery functions related to various damage states to consider the change of the transportation capacity under the seismic retrofit. Additionally, according to the benefit-cost ratio, the returning period of the seismic retrofitting investment can be estimated. Finally, two reinforced concrete bridges in Taipei are selected in the case study to demonstrate the application of the proposed estimation procedure.

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