An Experimental and Analytical Study on Buckling Properties of RC Columns Subjected to Cyclic Flexural Deformation

The present paper deals with experimental and analytical study on the buckling properties of rebar inside the reinforced concrete(RC)columns subjected to cyclic flexural deformation. The experimental results from thec cyclic loading test on RC column specimens with the different lateral hoop ratios have been examined with respect to the buckling behavior of rebar in the progressive failure zone (i.e.，plastic hinge zone). Also，the buckling behavior of rebar has been numerically investigated from the finite deformation analyses of rebar under cyclic axial compression. The buckling properties have been incorporated into the finite element program FFAP，and then the numerical results have been compared with the experimental data to check the validity of buckling model of rebar. It tums out that the finite element analysws on the post-peak behavioro of RC columns can be effectively performed by taking account of the buckling model of rebar at a structural level