配置600 MPa钢筋预制混凝土柱连接区抗震性能试验研究
Experimental research on seismic performance of connection area of precast concrete columns reinforced with 600 MPa steel

设计了2个钢连接件连接和3个半灌浆套筒连接预制钢筋混凝土柱试件，对试件进行了低周反复加载试验，研究了预制柱的破坏形态、滞回曲线、骨架曲线、位移延性、钢筋应变、刚度退化以及耗能能力，分析了连接形式、轴压比等因素对其抗震性能的影响。试验结果表明：采用钢连接件连接的预制柱Z-1的抗震性能比预制柱Z-2要好；3个采用半灌浆套筒连接的预制柱均能有效传递荷载，结合面处未出现滑移错动。采用钢连接件连接的预制柱Z-1与半灌浆套筒连接预制柱的滞回曲线、耗能能力相当，但后者变形能力更强。轴压比较高的预制柱，骨架曲线下降段更陡，变形能力更弱，但耗能能力更强。采用大直径纵筋半灌浆套筒连接的预制柱承载力略有降低，骨架曲线下降段较陡，后期刚度衰减更快，变形能力更弱。
Low frequency cyclic loading tests were conducted on two steel fastener connection and three grouting sleeve connections of precast reinforced concrete columns. The failure patterns, hysteretic curves, skeleton curves, displacement ductility, reinforcement strain, stiffness degradation and energy dissipation capacity were analyzed. The influences of connecting type, axial compression ratio on the seismic behavior were also investigated. The results show that the seismic performance of Z-1 is better than that of Z-2. The three grouting sleeve connections can effectively transfer the load, and no slip faulting occurred in combination with surface. The hysteresis curve and energy dissipation of the Z-1 as well as the grouting sleeve connection of precast reinforced concrete columns are comparable. However, the latter is more shape-shifting. For the precast concrete columns with high axial compression ratio, the skeleton curve goes down steeper, less shape-shifting yet more power-wasting. The bearing capacity of the precast column which uses larger diameter longitudinal reinforcement grouting sleeve connection is slightly lower. In addition, as the skeleton curve goes down steeper, the stiffness decays faster and the precast column is subjected to less deformation.