EXPERIMENTAL STUDY OF ASEISMIC BEHAVIOR OF STEEL-REINFORCED HIGH STRENGTH CONCRETE JOINTS

Five joints of steel-reinforced high strength concrete column and reinforced high strength concrete beam under reversed cyclic loading were tested. The mechanical behavior such as failure state, hysteretic behavior, displacement ductile coefficient and equivalent hysteretic damping coefficient of the joints are discussed. It is found that the displacement ductile coefficient and equivalent hysteretic damping coefficient of the joints are higher than those of reinforced high strength concrete joint and close to those of steel reinforced concrete joint. The effects of high strength concrete, steel ratio, stirrup ratio and joint core area on shear bearing capacity of the joints are analyzed in detail. Calculating formula of shear bearing capacity of the joints is established. A good agreement is reached between the calculations and the experimental results.