An Experimental Study of RC Columns With Captive Column Shear Failure Repaired By Cfrp

Abstract eng:
Seismic response of a RC (reinforced concrete) bare frame, a similar frame with partial infills causing captive column defect and repair of the damaged specimen with CFRPs (Carbon Fiber Reinforced Polymer) are investigated in this study. This study mainly aims to investigate the effectiveness of the repair scheme with CFRPs in terms of response quantities such as strength, ductility, dissipated energy and stiffness degradation. Therefore, two 1/3 scale, one bay, one story RC (Reinforced Concrete) frames, which have certain deficiencies resulting from low strength concrete and plain round bar were designed to represent the existing Turkish building stock. Bare frame, which is also reference specimen of this test series, was constructed without infilled wall. On the other hand, the captive column failure described in Turkish Earthquake Code 2007 (TEC 2007) is expected in the second specimen built with partially infilled wall. Severe damage was observed with the concentration of shear cracks in the columns of the specimen built with partially infilled wall. Then, the damaged members were repaired by CFRPs. Damaged RC columns were wrapped by CFRP sheets both in the longitudinal and transverse direction. Repaired specimen was retested to identify how effective the CFRP wrapping is in repairing the shear damage of captive columns. Reversed cyclic lateral displacement under combined effect of axial load was applied to the top of the column. After testing the specimens, flexural cracks were dominated the overall response of the bare frame. A brittle shear failure in the column top ends was observed in the specimen with partially infilled wall. It is found that the former capacity of the damaged specimen was recovered by the applied repair scheme.

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