الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Civil infrastructure systems, particularly highway bridges, play a pivotal role in human settlement and development. The degradation resulting from chloride-induced reinforcement corrosion has been observed as one of the most significant durability problems throughout the service life of highway bridges. Past research on chloride-induced corrosion deterioration of reinforced concrete structures has underlined the sensitivity of chlorides ingress in the concrete matrix to increase under the influence of temperature and humidity. Accounting for such effects, as a consequence of climate change, is particularly important since global warming (due to the continued increase in the emissions of greenhouse gases such as carbon dioxide) may lead to a time-dependent shift in average temperature and relative humidity. These effects, compounded along the service life with heightened chloride ingress require careful consideration for bridges located in regions near marine sources and characterized by moderate to high seismicity. This study proposes a framework to evaluate the vulnerability of highway bridges under a threat scenario considering earthquake hazards, aging and deterioration, and global warming due to climate change. Additionally, past studies have revealed the criticality of considering deterioration while computing seismic losses, that may constitute a significant percentage of the life-cycle cost planning for the structure. Recognizing the considerable impact of climate change on bridge degradation and seismic vulnerability, seismic life-cycle cost evaluation requires a renewed systematic assessment for informed decision making and economic investments. Addressing this critical need, this thesis proposes a novel framework to estimate the economic loss cost assessment of highway bridges considering seismic hazard, aging effects due to corrosion deterioration, and global warming due to climate change. Notwithstanding the high probability of simultaneous chloride and carbonation ingress in coastal urban cities, far too little attention has been paid to this joint deterioration mechanism on the bridge seismic fragility. Additionally there is a need to consider uncertainty associated with the corrosion initiation time while assessing bridge lifetime seismic fragility. In this regard, this study takes pioneering steps by assessing the subsequent influence of the concurrent modeling of carbonation and chloride-induced corrosion on the seismic response and fragility of aging bridges alongside a comprehensive treatment of uncertainty associated with the deterioration process.