钢纤维增强高强钢筋混凝土梁柱节点抗震性能试验研究

为研究配置HRB600高强钢筋钢纤维整体增强混凝土梁柱节点的抗震性能和核心区受剪承载力，进行10个梁柱节点的拟静力试验，研究轴压比、剪压比、配箍率、混凝土种类和钢纤维混凝土的增强范围等对配置HRB600钢筋混凝土梁柱节点抗震性能指标的影响.结果表明:钢纤维整体/局部增强的HRB600钢筋混凝土梁柱节点的滞回曲线更饱满，刚度退化速率更慢，耗能更高.钢纤维混凝土能够显著改善试件的破坏形态，减轻节点的累积损伤.采用《建筑抗震设计规范》计算HRB600高强钢筋钢纤维混凝土梁柱节点的受剪承载力时，对于配箍率较低的节点较为保守，对于配箍率较高的节点的计算结果更接近于试验值.美国ACI 352—02规范比中国《建筑抗震设计规范》的受剪承载力计算值的安全储备高.

Experimental Research on Seismic Behavior of High Strength Bar Concrete Beam-Column Joints Reinforced by Steel Fiber

In order to investigate the seismic behavior and shear bearing capacity of HRB600 high strength bar concrete beam-column joints reinforced by steel fiber， a quasi-static test of 10 beam-column edge joints was carried out. The influence of axial compression ratio， shear compression ratio， stirrup ratio， concrete type and reinforced range of steel fiber concrete on the seismic behavior index of HRB600 reinforced concrete beam and column joints was studied. The results show that the hysteresis curve of the HRB600 reinforced concrete beam-column joint with overall/local steel fiber is fuller， the rate of stiffness degradation is slower， and the energy consumption is higher. The steel fiber reinforced concrete can significantly improve the failure mode of the specimen and reduce the cumulative damage of the joints. When the formula of “Code for Seismic Design of Buildings” is used to calculate the shear bearing capacity of HRB600 high strength bar concrete beam-column joints reinforced by steel fiber， it is more conservative for specimens with a lower stirrup ratio， closer to the experimental value for high stirrup ratio. The predictions calculated by ACI 352—02 have a higher safety margin than the predictions given by “Code for Seismic Design of Buildings”.