FINITE ELEMENT ANALYTICAL MODELS FOR REINFORCEDCONCRETE COLUMNS REINFORCED WITH CFRP SHEETS

In order to build a uniform evaluating means of seismic ret rofitting performance of reinforced concretecolumns with CFRP sheet s , analytical models are studied through two-dimensional finite element analysis ( 2D-FEA) . Based on the paramet ric simulation of three RC columns st rengthened with CFRP sheet s , the applicabilityand availability of crack models , constitutive relationships on cracks and concrete compressive models are investigated. The result s show that Darwin-Pecknold’s equivalent uniaxial st rain model can be used to simulate the nonlinearbehavior and st rengthen effect of RC columns through comparing with test result s. The modified Kent-Park’s confinement model can be used to evaluate the influences on capacity of confinement effect s f rom hoop steels and CFRPsheet s , and Darwin’s failure criteria can be used to evaluate the concrete failure in a biaxial st ress state. Seismic retrofit ting performances of RC columns st rengthened with CFRP sheet s are verified by analyzing load2deformation relations and the processes of st ress-st rain at the inflection point and the foot of the columns.