Strengthening Design Limitations of an RC Frames Using FRP Column Wrapping Considering Column-to-Beam Strength Ratio

The aim of this paper is to study the influence of the column-to-beam strength ratio on the seismic strengthening of a column with a fiber-reinforced plastic (frp) wrapping system. frp wrapped reinforced concrete (rc) columns are analyzed to obtain moment-curvature curvesusing frp confined concrete characteristics. a pushover analysis of a 2d model was performed on one and three-story moment-resisting frames, with different column-to-beam strength ratios.the results indicate that frp strengthening is more efficient in frames with a low ratio of column-to-beam strength, due to the type of lateral failure mechanism of the frame. also, high values of the column-to-beam strength ratio can be benefited by low values of the confiningpressure. in case of a column strength greater than a beam strength, beyond a certain confining pressure ratio, further enhancement in performance will not be achieved. therefore, the level of effective wrapping on frame performance enhancement is controlled by the column-to-beam strength ratio.