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Investigation of Wind Effects on Bridges Induced by Tornadoes for Tornado-Resistance Design – Phase I
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2020-09-15
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[PDF-3.32 MB]
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Edition:Final Report January 2019-June 2020
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Abstract:The impact of tornadoes on civil structures is often devastating and results in loss of property, injury of human beings and/or loss of lives. Thirteen bridges were destroyed or severely damaged by tornadoes in the USA in the past. Even in the latest version of the AASHTO Bridge Design Specifications (8th Edition 2017), no specifications on design tornadic wind loads have been included. To prevent bridges from being severely damaged or destroyed during future tornado incidents, it is imperative to characterize the wind effects induced by tornadoes on bridges and determine the design tornadic wind loads for bridges. This project characterized the wind effects of tornadoes on bridges using computational fluid dynamics (CFD) simulations, and modified the equations for calculating the design wind pressure on bridges. The obtained research findings will facilitate the tornado-resistance design of new bridges and the reinforcement of existing bridges to be tornado resistant. This will eventually prevent bridges from failure during tornado incidents to enhance the safety of highway or railroad bridges.
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