| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班（碩士在職專班） === 103 === Invasion of carbon dioxide and chloride into reinforced concrete (RC) could weaken protection of reinforcement from corrosion. For the corrosive reinforcing bar, the effective cross sectional area becomes less and the bond capacity interacted with concrete decreases as well. Consequently, the degradation of structural capacity, functionality and even durability of bridges appear significantly accompanied by material deterioration.
This thesis collected a few inspection reports of bridges and the environmental data of corrosive factors herein to propose a GPS-based corrosive model of reinforcement in RC bridges by regression analysis. Some useful information about neutralization depth, chloride penetration depth, annual corrosive speed of reinforcing bar, etc. are able to be calibrated quantitatively. Accordingly, the hazard map of corrosive reinforcing bar in RC bridges was established by use of Google Fusion Table. Not only the potential zone of corrosive reinforcing bar can be displayed but also the degradation tendency of structural performance can be predicted quantitatively for durability design or evaluation and strategy setting of bridge maintenance. In addition, time-dependent seismic fragility curves of the deteriorated bridges was developed and the distribution curve of annual seismic loss of the deteriorated bridges can be determined for optimal strategy of seismic repairing or retrofitting.
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