配置HRB600E高强钢筋的混凝土柱抗震性能试验研究

Experiment research on seismic performance of column reinforced with HRB600E bars

HRB600E钢筋是一种新型高强度钢筋,为改善矩形柱抗震性能并推广HRB600E级高强钢筋的应用,通过对6个配置HRB600E钢筋的不同轴压比、不同钢筋强度和纵筋配筋率的混凝土矩形柱进行低周往复荷载试验,得到试件的滞回曲线、骨架曲线和纵筋应变曲线。对比分析高强钢筋混凝土柱的破坏特征、滞回特性、骨架曲线、刚度退化等抗震性能指标。研究结果表明:配置HRB600E高强钢筋的混凝土柱的破坏特征与配置普通钢筋的混凝土柱相似;通过减小轴压比或增加钢筋强度均能改善配置HRB600E高强钢筋试件的滞回特性、减缓刚度退化、提高试件的抗震性能;配置高强钢筋的构件与高强混凝土配合使用时受力性能更优。

HRB600E bar is a new type of high-strength reinforcing bar.For improving the seismic performance of rectangular columns and popularizing the HRB600E bar,the reversed cyclic loading test for different coaxial compression ratio,reinforcement strength and longitudinal reinforcement ratio is firstly carried out for the six high strength reinforced concrete columns with HRB600E bars.Then,the hysteric curve,skeleton curve and longitudinal reinforcement strain curve of specimen under low cyclic reversed loading were obtained.Finally,the failure characteristics,hysteresis characteristics,skeleton curves and stiffness degradation of high strength reinforced concrete columns are analyzed.The results showed that the failure characteristics of the high strength reinforced concrete columns with HRB600E are similar to the common reinforced concrete columns.Reducing the axial compression ratio or increasing the reinforcement strength can improve the hysteresis characteristics of high strength reinforced concrete columns with HRB600E bars.Besides,the seismic performance of the specimen can be improved by reducing stiffness degradation.The mechanical behavior of the high strength reinforced concrete columns is better when used with high strength concrete.