IMPROVEMENT MEASURE ON ASEISMIC BEHAVIOR OF SPECIALLY SHAPED COLUMN JOINTS UNDER CYCLE LOADING

The T-shaped steel reinforcement, groove-shaped steel reinforcement, or X-shaped reinforcement to the weak part of a specially shaped column joint is proposed. The aseismic behavior of a joint was investigated under low cyclic loading. The effect of different improvement measures on aseismic behaviors in terms of damage characteristic, bearing characteristic, hysteretic characteristic, energy dissipation and cumulated damage were analyzed. The results show that the hysteretic characteristic of a joint reinforced by T-shaped steel, groove-shaped steel or X-shaped reinforcement is improved, the bearing capacity and deformation capacity are enhanced and the degree of cumulated damage is lightened. Therefore, the aseismic behavior of a specially shaped column joint with T-shaped steel, groove-shaped steel or X-shaped reinforcement is improved. The aseismic behavior of a joint reinforced by X-shaped reinforcement is better than that of a joint reinforced by T-shaped steel, or groove-shaped steel.