Behavior of reinforced concrete short rectangular columns strengthened by steel lattice framed jacket

Abstract

The complete derivation of the more exact solution that controlled the behaviour of reinforced concrete short rectangular column strengthened by steel lattice frame jacket is presented including the effect of bond slip between the concrete and reinforcement and that between concrete and steel jacket. Bond between these materials is considered well through assuming an existing of distributed frictional springs. An exact displacement field is derived utilizing the principle of minimum strain energy following Euler –Cauchy formula. Stress -strain diagram for confined concrete by internal reinforcement and external steel jacket is suggested. An empirical equation that controls the effect of interface spring stiffness between concrete and steel jacket is found through experimental investigation. A computer program is prepared using visual basic language and designated as (ARCC–SSJ)1 including all the above work. The validity and efficiency of the presented finite element is tested through comparison with others experimental results. Present study shows good agreement.