David GALICIA GARCIA
Effect Evaluation of Repairing Method using CFRP Sheet for Steel Girder End
Takeshi MIYASHITA
In recent years, a new method to repair corroded steel girders ends using CFRP (Carbon Fiber Reinforced Polymer) sheets has been proposed. This new method has been already included on the Nippon Expressway Company Standards Manual.
In this research, the target of study is a steel bridge in service, in which severe corrosion damages were found in the vicinity of two supports. After performing the corresponding examinations, it was decided to repair the bridge by using CFRP repair method. However, since this is a new method, there are only a few cases where CFRP was used to repair steel bridges, and data about its performance on real bridges is still scarce. Therefore, the main objective of this study is the evaluation of CFRP repair method performance on a corroded steel girder end through on-site loading tests and a three-dimensional Finite Element Model. In addition, since there are concerns about the difference that might exist between the correction coefficient adopted in the design manual and the one that must be used in real bridges when certain conditions are not complete fulfilled, an examination about the suitability of the correction coefficient adopted in design procedure is conducted.
Based on the obtained results, it was found that for the section where CFRP sheets were bonded, the strain level was reduced in a range from 55~80%, with an averaged value of 69%, confirming a strain reduction due to CFRP repair method. About the suitability of the correction coefficient used during the design procedure, it is determined that since there is no big difference between the strain reduction levels obtained for each coefficient (0.44 & 0.74), it seems like its determination for each section can be omitted and the value described in the design manual can be adopted without significant variation in the results.
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