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چکیده
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Attaching fiber-reinforced polymer (FRP) strips externally on the surface is a beneficial strategy for retrofitting and repairing reinforced concrete (RC) beams subjected to flexural loading. Despite widespread usage of continuous RC beams, research addressing their performance when reinforced externally with FRP strips is scarce. The loading capacity, moment redistribution capacity, and ductility of FRP strip-reinforced RC members are lower than those of RC beams without FRP strips, due to debonding failures. To avoid early failure in an RC beam reinforced with FRP strips, various anchorage techniques have been proposed. An experimental study was carried out in this research to investigate the flexural performance and moment redistribution capacity of continuous (two-span) RC beams reinforced with carbon fiber-reinforced polymer (CFRP) strips. To avoid untimely failure and improve load-carrying and moment redistribution capacity, as well as ductility, an end anchorage mechanism was proposed. Here, four 6000-mm continuous beams with 250 × 150-mm sections were constructed. The obtained results indicated that utilizing the proposed anchor for the CFRP strips in the continuous beams led to a considerable increase in the loading capacity, moment redistribution ratio, and ductility in comparison with the CFRP-reinforced beams without the anchor. Furthermore, for predicting the load-bearing capacity of a continuous RC beam reinforced using CFRP strips, an analytical model was put forward, whose results showed proper agreement with the test results.
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