مدل سازي رفتار سخت شدگي المان هاي بتن مسلح تقويت شده با FRP در كشش خالص

MODELING OF TENSION STIFFENING BEHAVIOR OF REINFORCED CONCRETE ELEMENTS STRENGTHENED WITH FRP

Concerning the extent of applying composite materials, especially Fiber Reinforced Polymer (FRP), for the re¬habilitation of concrete structures, developing a suitable method for analyzing RC elements strengthened with NfA FRP sheets is necessary. In this paper, a micro me¬chanical approach is introduced for simulating tension stiffening and crack formation in RC members strength¬ened with FRP. On the basis of the proposed theoretical approach, the spatial average stress-strain relationship of reinforcing bars, FRP and cracked concrete, as well as average crack spacing and width, can be numerically simulated. Verification of the proposed method is car¬ried out through comparison with some experimental re¬sults.