Fiber reinforced polymer (FRP) has been applied not only for the simple structures but alsoudfor the advanced structures such as bridges or highway bridges for sustainable construction. In case ofudbridges or highway bridges, the structures experience not only static loadings but also fatigue loadingsudthat may limited the serviceability of the bridge structures. In order to extend of the application ofudFRP on the such bridge structures to have a sustainable structures, the flexural capacity due to fatigueudloading should be claritied. Glass composed FRP sheet namely Glass Fiber Reinforced Plasticsud(GFRP) is most commonly used due to its relatively lower cost compared to the other FRP materials.udGFRP sheet is applied externally by bonding it on the concrete surface. Many studies have been doneudto investigate the flexural capacity of concrete beams strengthened using GFRP sheets. However,udstudies on the flexural capacity after fatigue loadings are still very rarely. This study presented theudresults ofexperimental investigation on the flexural capacity of the strengthened concrete beams afterudfatigue loadings. A series of concrete beams strengthened with GFRP sheet on extreme tensionudsurface were prepared. Results indicated that after 800000 time of load cycl'e, the flexural capacity ofudbeams specimens may decrease to only approximately 60%. The beam failed due to delaminating ofudGFRP sheet
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