Experimental Study on the Effect of Axial Compression Ratio on the Aseismic Behavior of SRHC Column and RC Beam Frame Side Joints
JIA Jinqing;LI Yong;LIU Wei;State Key Laboratory of Coastal and Offshore Engineering,Dalian University of Technology;
In order to study the effect of axial compression ratio on the seismic behavior of frame side joints of the steel reinforced high-strength concrete( SRHC) column and reinforced concrete( RC) beam,static loading tests were conducted on 3 joint specimens,through which the failure patterns,hysteretic curve,frame curve,ductility and energy dissipation of the specimens under low-cycle repetitive loading were obtained. The results showed that,the axial compression ratio had a significant impact on the failure patterns of the specimens,when the axial compression ratio reached 0. 25 the plastic hinge failure occurred at the beam ends with better ductility; when the ratio reached 0. 38,shear failure occurred at the core section of the joints along with the plastic hinge failure at the beam ends; when the ratio reached 0. 45,the failure process shortened significantly,and shear failure occurred at the core section of the joints. It is found that when the ratio was 0. 25,the hysteretic loop presented an ideal full curve,the frame curve descended gently; while when the ratio was 0. 38,the displacement ductility coefficient decreased 53%,and the equivalent viscous damping coefficient decreased 20%. These results indicate that the higher the axial compressive ratio the weaker the ductility and therefore the worse the aseismic energy dissipation of the specimens.