Experimental Study And Finite Element Analysis On R.C. T-shape Columns Strengthened With Complex Method

With the increase of the useful life of special-shaped columns, a number of special-shapedcolumn structures had experienced earthquakes and had been damaged, because of the updatingof the specification some shaped column structure can not meet current design requirements. Forthese reasons, the numbers of special-shaped columns which need reinforcement are increaseing.However, studies have shown that shaped columns'force performance is different fromrectangular column and the study about shaped column reinforcement is in the blank stage. So isnecessary to study on the seismic reinforcement of shaped column.In this paper, with the method of bonded steel reinforcement, CFRP reinforcement andcomposite strengthening between the two, six RC T-shaped columns were reinforced andcomplete the experimental research of the above six reinforced columns and one not reinforcedin the low-cycle repeated loads. Two key parameters different reinforcement methods and thedestruction of the T-shaped columns impacting on composite strengthening effect are discussedin this text. The results show that: the flexural bearing capacity of the T-shaped columnsreinforced with bonded steel have a substantial increase; the ductility of the T-shaped columnsreinforced with CFRP have a substantial increase; the ultimate bearing capacity, ductility andenergy dissipation of the special-shaped columns reinforced with bonded steel and CFRP have asubstantial increase. The damage situation of the RC T-shaped columns can reduced theReinforcement effect on the bearing capacity, ductility, and energy dissipation.Basis on the test constitutive relations and reasonable parameters for every kind of materialare selected and ANSYS finite element pragram are used for these reinforced T-shaped columns.The load-displacement curves are consistent with the experimental results. On this basis, thehorizontal bearing capacity of the composite reinforced columns which along the X-axisdirection of the cross-section centroid is calculated and analyzed. Analysis show that thecomposite reinforced concrete compressive stress increased; carbon fiber stress unevendevelopment and occurred stress concentration in tension flange side of the root and carbon fiberstress with specimen height increases; steel plate at the flange play a full strength and steel plateat the web almost play no role.