Seismic Behavior Of Reinforced Concerte Exterior Joint Partially Reinforced By Steel Fiber

Four samples of exterior joint were made in this paper, one of the samples was made of high-strength concrete according to current codes, other were reinforced by steel fiber in the core area of the joints. The size of these joints was column height 1470mm with the cross section 200mm×200mm and beam length 1260mm with the cross section 200mm×200mm. Through the experiment under low cyclic loading, the theoretical analysis was carried out as follows.1. The deflection was studied in detail to find out the composition and cause of the deflection of the beam, and at the same time, the influences of the steel fiber in the core area of the joints on the deflection, the sectional curvature, position of the plastic hinge was compared and analyzed. The seismic performance of the steel fiber reinforced high-strength concrete joints was evaluated comprehensively.2. The influence of the steel fiber content in the core area of the joints on the cracking load, ultimate bearing capacity and stiffness of high-strength concrete joints was analyzed.3. The behavior of high-strength concrete and the steel fiber high-strength concrete exterior joints was simulated by finite element method.The results show that steel fiber reinforced concrete partially substituted for stirrups could guarantee the integrity of the joints, and force the plastic hinge to be far away from the joint core area, as a result the seismic performance of these joints was improved.