Flexural Enhancement of RC Columns with FRP

Abstract eng:
The application of composite materials has been developed in strengthening and retrofitting of concrete structures through recent years, so that many of concrete structures would be strengthened by these materials. one of theses applications are FRP material used in strengthening and retrofitting of reinforced concrete columns. Results of studies have shown that wrapping of reinforced concrete columns with FRP caused increasing of ductility and compressive strength of RC columns. Since, almost all RC columns are affected by axial force and moment bending. Studies of interaction curve of wrapped RC columns with FRP shows that just compressive control region in interaction curve enhance and wrapping of columns with FRP has no affected on tension control region of RC columns. The objective of this research program is to enhancement flexural strength of RC columns with high and low axial steel content when retrofitted by FRP system that oriented in the direction of applied axial load. one reinforced concrete column designed and modeled under lateral cyclic loading and constant axial load. it is demonstrated analytically that it is possible to strengthen the flexural resistance of RC columns.

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