United States Department of Transportation
i
Investigation of Wind Effects on Bridges Induced by Tornadoes for Tornado-Resistance Design – Phase II
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2022-01-15
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[PDF-5.68 MB]
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Edition:Final Report January 2020-November 2021
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Abstract:Tornadoes have destroyed or severely damaged a number of bridges in the USA. Considering that tornadic wind loads have not been considered as a design load in the latest version (the 8th Edition, published in 2017) of the AASHTO Bridge Design Specifications, in Phase I of this project starting in January 2019, the PI has been characterizing the wind effects induced by tornadoes on bridges. In fact, bridges do not normally experience large deformation and vibration during strong winds. That is, the bridge can be assumed to be rigid in the computational domain, and the wind pressure on the bridge can be determined without consideration of the wind-bridge interaction, which is suitable for short-span or middle-span bridges. This project (Phase II) is to characterize the wind effects induced by tornadoes on those bridges whose deformation and vibration are significant under strong winds. In this case, the wind-bridge interaction will be considered. This is suitable for long-span bridges, such as cable-stayed bridges and suspension bridges. The obtained research findings will be used to modify the equations for calculating the design wind pressure on bridges, preventing bridges from being severely damaged or destroyed during future tornado incidents.
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