| It is a new form of reinforcement for concrete structure to strengthen them with combination of bonded steel angles (BSA) and carbon fiber reinforced polymer sheet(CFRP). We must know the combination rehabilitation weather can greatly improve the the inclined section bearing capacity of RC columns before it is used in engineering. Based on this purpose, Seven reinforced concrete columns strengthened with combination of bonded steel angles and carbon fiber reinforced polymer sheet have been conducted to investigate the sheer behaviors, and commended a reasonable shear capacity design formula of combination rehabilitation.At first this passage summarized the prospect of the science of rehabilitation, and introduced the common rehabilitation methods, and introduced the research status in reinforcement with CFRP and bonded steel anglesBased on the influence of several parameters, seven reinforced concrete columns strengthened with combination of bonded steel angles and carbon fiber reinforced polymer sheet (CFRP) under cyclic loads have been conducted to investigate the sheer behaviors. Manufacture of the specimen, the whole experiment process and especially concerning phenomena are expounded. Compared with un-strengthened columns, there is a remarkable improvement in sheer capacity and the load-carrying capacity of flexural-compressive concrete columns strengthened with combination of bonded steel angles and CFRP.Based on confirmation of stress-strain relationship model of steel and core concrete subjected to cyclic loads, this passage commended a reasonable shear capacity theoretic formula based on truss-arch model, on the based of it ,a reasonable shear capacity design formula is commended. Compared to the results of the experiment, the calculate results inosculate well, and can be referenced in engineering practice .
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