DESIGN AND ANALYSIS OF COMPOSITE WRAPS FOR CONCRETE COLUMNS

Composite jackets for concrete columns have potential for renewal of d eteriorated structures and improving seismic resistance. Several exper imental investigations have demonstrated that composite wraps increase load-carrying capacity and ductility of concrete columns subjected to axial compression. This paper describes a theoretical model to predic t the nonlinear stress-strain response of the wrapped columns as a fun ction of geometry and the constitutive behavior of the concrete and co lumn wrap. Model predictions are compared to experimental results. The analytical equations can be used to develop relevant guidelines for o ptimum reinforcement efficiency as a function of column size and wrap architecture.