Abstract：Based on speedy repair requirements after earthquake, a method of Steel Reinforced Concrete (SRC) frame columns strengthened by Carbon Fiber Reinforced Polymer (CFRP) was proposed. One third scaled models of four SRC frame columns were designed and manufactured. One model was prototype control specimen, one was strengthened by CFRP, and the others were pre-damaged and strengthened. The destruction tests under lateral cyclic load on the models were carried out. The test results show that seismic-damaged frame columns strengthened by CFRP can meet the strong shear-weak bending requirement of seismic design， and the failure modes of all columns are the flexural failure under combined loadings of compression, bending and shear. Compared with the prototype control specimen， the average ultimate loading and the average ultimate displacement of the moderately damaged specimen after retrofit are increased by 10.41% and 35.40% respectively. The average ultimate loading and the average ultimate displacement of the severely damaged specimen after retrofit are increased by 13.71% and 32.68% respectively. In general, the strengthening method of seismic-damaged frame columns by CFRP is an effective method for seismic strengthening.
