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In this study flexural strength of damaged concrete beams reinforced by CFS is analysed. Nonlinear section analysis is used to include stress status of tension bars and compressive concrete under loads acting on the original member at the time of strengthening. Calculated flexural strength is compared with Sin-Hong formula which is frequently used in CFS reinforcement design. Nonlinear analysis with variation of the number of strengthening CFS, the ratio of tensile reinforcement, the ratio of section dimension shows that the flexural strength of CFS reinforced beams much depends on reinforcing stage. From the result of this analysis, the flexural strength of CFS reinforced concrete beam is reduced according to the magnitude of pre-loaded service loads. Key Words : CFS reinforcement, Service loads, Flexural strength, Nonlinear section analysis *  : (koosin@tu.ac.kr) 11 05 30  (1 11 07 07, 2 11 08 02)  11 08 11 1.             ,               [1,2].         ,                     [3].                    .           ,  , ,          ,        ,

Analytical Study on the Flexural Strength of CFS Reinforced Concrete Beams under Service Loads