Disaster Risk Analysis of Highway Bridges from Vulnerability Perspective

抄録

The flood caused by typhoon Morakot resulted in mass fatalities, prompting demands for improving coping capacities to extreme climate events. The capacity improvement must involve determining and relieving socioeconomic vulnerabilities. Along with resource allocation and pre-evacuation, transportation systems play a crucial role during the disaster response and recovery. Highway bridges significantly impact the network accessibility. However, previous literature focused on the physical vulnerability of bridges from the engineering or disaster-loss assessment perspective. This study thus examines the disaster risk of bridge failure from a vulnerability perspective. 11 vulnerable factors are generated by impact chain and evaluated via geographic information system. The results reveal that accessibility and redundancy remarkably affect vulnerability and risk. The risk maps help decision-maker understand the vulnerability and adopt appropriate strategies for reducing disaster risk.