配置HRB500级高强钢筋混凝土桥墩的抗震性能试验

Experiment on anti-seismic behavior of bridge columns with HBR500-class high-strength reinforced concrete

对3个配置HRB500级高强钢筋的桥墩试件及1个配置普通钢筋的桥墩试件进行低周反复荷载试验,对比分析配置HRB500级高强钢筋桥墩试件的破坏特征、承载力及延性性能、滞回特性、刚度退化和耗能能力等抗震性能指标.研究表明:纵筋和箍筋均配置HRB500级高强钢筋的桥墩试件承载力提高较大,延性性能也较好;当纵筋配筋相同时,箍筋配置HRB500级高强钢筋的桥墩试件滞回曲线更加饱满,变形能力更好,刚度退化速度较慢.

Low cyclic reciprocal loading experiments are performed with three RC bridge columns reinforced with HRB500-class steel bars and one reinforced with normal steel bars,and their anti-seismic behavior indexes such as damage characteristics,bearing capacity,ductility,hysteretic characteristic,rigidity degradation and energy dissipation are compared and analyzed.The results show that the bearing capacity of the RC bridge columns reinforced with HRB500-class longitudinal and hooping steel bars is fairly improved and its ductility is better also.When the bridge columns have identical longitudinal reinforcement,the hysteresis curve of RC bridge columns with HRB500 stirrups will be fuller,deformation capacity better,and rigidity degradation slower.