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A platform for research: civil engineering, architecture and urbanism
Life Estimation of Canadian Roadway Bridges Considering Effect of Damage on Fatigue Limit
Fatigue failure is a significant design consideration for bridge elements. In design codes, fatigue design of a bridge element involves passing a code truck over a model of the bridge and then calculating the stress range for the element of interest. For the infinite life design of Canadian bridges, the code stress range multiplied by a correction factor should be lower than the fatigue limit of the element. This correction factor accounts for the differences between the code truck and the trucks in the real traffic. As the truck weights in the real traffic can significantly vary, a small percentage of real traffic stress ranges can be over the fatigue limit and damage the bridge elements. This can also happen due to overload trucks or trucks that cross the bridge simultaneously. Therefore, the actual life of components that are designed based on the current infinite life design procedure may not be infinite. However, their lives can still be very long. This work evaluates the fatigue life of bridge elements based on damage from the stress ranges that are over the fatigue limit. Two traffic databases from the Ontario Ministry of Transportation, obtained in 1995 and 2012, are employed in this work. Miner’s sum is used to determine the damage due to stress ranges that are over the fatigue limit of the component. The results of this study show that the current infinite life design criteria in CSA S6 can be unconservative for bridge elements with long influence lines.
Life Estimation of Canadian Roadway Bridges Considering Effect of Damage on Fatigue Limit
Fatigue failure is a significant design consideration for bridge elements. In design codes, fatigue design of a bridge element involves passing a code truck over a model of the bridge and then calculating the stress range for the element of interest. For the infinite life design of Canadian bridges, the code stress range multiplied by a correction factor should be lower than the fatigue limit of the element. This correction factor accounts for the differences between the code truck and the trucks in the real traffic. As the truck weights in the real traffic can significantly vary, a small percentage of real traffic stress ranges can be over the fatigue limit and damage the bridge elements. This can also happen due to overload trucks or trucks that cross the bridge simultaneously. Therefore, the actual life of components that are designed based on the current infinite life design procedure may not be infinite. However, their lives can still be very long. This work evaluates the fatigue life of bridge elements based on damage from the stress ranges that are over the fatigue limit. Two traffic databases from the Ontario Ministry of Transportation, obtained in 1995 and 2012, are employed in this work. Miner’s sum is used to determine the damage due to stress ranges that are over the fatigue limit of the component. The results of this study show that the current infinite life design criteria in CSA S6 can be unconservative for bridge elements with long influence lines.
Life Estimation of Canadian Roadway Bridges Considering Effect of Damage on Fatigue Limit
Lecture Notes in Civil Engineering
Gupta, Rishi (editor) / Sun, Min (editor) / Brzev, Svetlana (editor) / Alam, M. Shahria (editor) / Ng, Kelvin Tsun Wai (editor) / Li, Jianbing (editor) / El Damatty, Ashraf (editor) / Lim, Clark (editor) / Chehrazi, Ali (author) / Chien, Michelle Y. X. (author)
Canadian Society of Civil Engineering Annual Conference ; 2022 ; Whistler, BC, BC, Canada
Proceedings of the Canadian Society of Civil Engineering Annual Conference 2022 ; Chapter: 76 ; 1123-1134
2023-08-06
12 pages
Article/Chapter (Book)
Electronic Resource
English
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