Cavalcante, Gustavo Henrique Ferreira (2022) Seismic risk analysis of typical bridges located in the northeastern Brazil. PhD thesis, Universidade Estadual de Campinas, Brazil.
Abstract
Risk assessment is an essential tool in predicting losses from extreme events, such as earthquakes. Earthquakes, although infrequent, are not uncommon in Northeastern Brazil. These events are characterized by their high destructive power, which needs to be considered in the structural analysis of constructions with high importance, such as bridges. These structures are the most vulnerable components in a road transport system. Therefore, bridges located in Northeastern Brazil under the supervision of the National Department of Infraestructure and Transport (DNIT) are evaluated for estimates of probable losses due to earthquake damage. For this, 250 inspection reports provided by DNIT are evaluated for the development of a statistical inventory, which is used in vulnerability and exposure analyses through the creation of representative bridge classes by variable geometric parameters. Risk is defined as the combination of hazard, vulnerability and exposure. The latter is defined by the location of the structures, while vulnerability can be assessed by fragility functions that define failure probabilities for limit states as a function of earthquake intensity. Hazard can be characterized by the mean annual frequency of earthquakes as a function of their intensities. Therefore, capacity and demand analyses are perfomed to develop fragility functions, which are combined with hazard curves to generate annual failure probability maps based on the vulnerability of each bridge class. Finally, these maps are combined with the geographic location of each bridge to estimate direct losses. These results aim to support decision makers in assessing the need to apply seismic risk mitigation methods and in creating post-event emergency founds.
| Item Type: | Thesis (Doctoral) |
|---|---|
| Thesis advisor: | Siqueira, Gustavo Henrique |
| Uncontrolled Keywords: | earthquakes; risk assessment; earthquake engineering; disaster vulnerability |
| Index terms: | mitigation, vulnerability, exposure, maps, structural analysis, demand analysis, Brazil, earthquake, risk assessment, supervision, estimate, extreme event, inventory, seismic risk, inspection |
| Subjects: | public and environmental health, financial and cost management, control systems, environmental hazards, quality assurance, market analysis, financial risk, Geography, inventory management, spatial and geospatial analysis, structural engineering |
| Topics: | Quality Management, Supply Chain Management, Health and Safety, Project Management, Geographical Context, Engineering Principles, Sustainability, Cost Management, Research Practice |
| Descriptive scope: | 3 PCA |
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