Title of the Keynote: Probabilistic Assessment of Vehicle Driving Safety under Strong Winds
POSCO Chair Professor, Dept. of Civil and Environmental Engineering, Seoul National University, Korea
Dr. Ho-Kyung Kim is POSCO Chair Professor in Dept. of Civil Engineering and Environmental Engineering at Seoul National University, Korea. Up to now, he has participated in many cable-supported bridge projects, particularly on wind-related issues. His research interests include bridge aerodynamics, structural health monitoring, and operational decision-making of infrastructures. He is a Vice President and Fellow member of IABSE, the Chair of the Korean Group, and a member of TG3.1 for Super-Long Span Bridge Aerodynamics of IABSE. He serves as the Korean Panel Chair of the International Association for Structural Control and Monitoring(IASCM) and the Chair of the TC-18 on the Long Span Bridges, Asian Civil Engineering Coordinating Council(ACECC). In addition, he served as the Chair of the Scientific Committee of IABSE Seoul 2020 for Risk Intelligence of Infrastructures.
The strong side winds threaten the stability of running vehicles over the sea-crossing bridges due to the high altitude of the deck and free exposure to the upcoming winds. Therefore, bridge operators control the speed limit or close the bridges when the wind speed reaches predetermined criteria. Since the sea-crossing bridges play an essential role in transportation networks, the traffic control strategy, including complete closure, requires a careful assessment of the critical wind speed at which the vehicle instability can occur. As the aerodynamic forces on vehicles are dependent on several influence factors, including the geometrical shape of the superstructure, the critical wind speeds variate bridge by bridge. This study demonstrates a framework to determine the critical wind speed. In particular, this study reports two actual overturning accidents experienced in a double-deck suspension bridge and a cable-stayed bridge. By applying the proposed framework to the cases, the authors successfully explained the cause of accidents. For this investigation, the authors used a wind tunnel measurement of aerodynamic loads on vehicles and the vehicle dynamics to determine critical wind speed curves. The authors also extended the procedure to the probabilistic risk assessment by adding the long-term wind data analysis of the bridge site. In this way, this study provides a guideline for bridge operators on balancing the driving safety and the continuous mobility of the sea-crossing bridges under hazardous high wind conditions.