HRB600钢筋钢纤维混凝土梁柱边节点抗震性能试验研究

为减小配置HRB600钢筋梁柱边节点的梁筋粘结退化，设计钢纤维整体增强或局部增强的梁柱边节点，进行两个配置HRB600/HRB400钢筋混凝土梁柱边节点和2个配置HRB600高强钢筋的钢纤维整体增强或局部增强的混凝土梁柱边节点的低周往复荷载试验，得到试件的破坏形态和滞回曲线，对比分析边节点的耗能能力、延性性能、核心区剪切变形和梁筋粘结退化。结果表明：往复荷载下HRB600钢筋混凝土节点具有较高的承载能力、耗能能力和延性性能，但HRB600钢筋与普通混凝土粘结退化过快；钢纤维整体增强或局部增强混凝土的措施可以减缓HRB600梁筋粘结退化，改善边节点的破坏形态，减小核心区的剪切变形，提高耗能能力；钢纤维整体增强的梁柱边节点具有更高的延性性能和耗能能力，其HRB600梁筋粘结退化更为缓慢。

Experimental analysis on seismic behavior of steel fiber concrete beam-column exterior joints with HRB600 reinforcement bars

In order to reduce the bond degradation of beam reinforcement bars in beam-column exterior joints with HRB600 reinforcement bars, the beam-column exterior joints with overall or local steel fiber concrete were designed. The low-cycle loading tests were carried out on two ordinary concrete beam-column exterior joint with HRB600/HRB400 reinforcement bars, and two steel fiber concrete beam-column exterior joints with overall or local steel fiber concrete and HRB600 reinforcement bars. The failure modes, hysteresis curves, energy dissipation, ductility, shear deformation in the core zone and bond degradation of beam reinforcement bars were analyzed. The research results showed that the joints with HRB600 reinforcement bars exhibited higher bearing capacity, energy dissipation capacity and ductility under low-cycle loading, but the bond degradation between HRB600 reinforcement bar and ordinary concrete degraded too quickly. The exterior joint reinforced by overall or local steel fiber concrete exhibited slower bond degradation of HRB600 beam reinforcement bars, slighter failure mode, smaller shear deformation in the joint core area, and larger energy dissipation capacity. The beam-column exterior joint with overall steel fiber concrete had higher ductility and energy dissipation capacity compared with the beam-column exterior joint with local steel fiber concrete, and the bond degradation of HRB600 beam bars was slower.