600MPa级钢筋混凝土柱抗震性能试验研究

EXPERIMENTAL STUDY ON ASEISMIC BEHAVIOR OF REINFORCED CONCRETE COLUMNS WITH GRADE 600 MPa STEEL BARS

为研究配置600 MPa级钢筋混凝土柱的抗震性能,对5个配置600 MPa级钢筋混凝土柱和1个对比普通钢筋混凝土柱进行低周往复荷载试验;分析了钢筋强度、箍筋间距和轴压比对试件破坏形态、滞回性能、承载力及延性、耗能性能以及刚度与强度退化的影响。研究结果表明:试件仍主要发生弯曲破坏,但600 MPa级纵筋与混凝土间出现了明显的粘结失效,且纵筋容易断裂;提高钢筋强度,试件的承载力和能量耗散均显著增加,但延性和耗能能力有所降低;而增大箍筋间距会明显降低试件延性和耗能能力,加快试件后期的强度衰减,但基本不影响承载力。总体上看,600 MPa级钢筋混凝土柱具有较好的抗震性能,能通过合理的设计将其应用于抗震结构中。

To investigate the aseismic behavior of RC columns with grade 600 MPa steel bars,five RC columns with grade 600 MPa steel bars and one RC column with conventional steel for comparison were tested under cyclic loading.The effects of steel bar strength,stirrup spacing and axial compression ratio on failure model,hysteretic behavior,bearing capacity and ductility,dissipation capacity,and degradation of stiffness and strength were analyzed.The test results showed that:the failure pattern of specimens is the bending failure,and the bond failure between the grade 600 MPa longitudinal bars and concrete and the fracture of longitudinal bars were observed.The bearing capacity and energy dissipation of specimens increased significantly with the improvement of steel bar strength,while the ductility and energy dissipation capacity of specimens decreased.Increasing the stirrup spacing decreased the ductility and energy dissipation capacity and accelerated the strength degradation of specimens in late loading,but there was little effect on bearing capacity of specimens.It is concluded that the RC columns with grade 600 MPa steel bars has a good aseismic behavior and can be used in aseismic structures by reasonable design.