中文摘要：

为了研究高强度钢筋对试件抗震性能的影响,对11个配置HRB335,HRB500E,HRB600钢筋的混凝土圆形柱进行了水平低周反复荷载作用下的拟静力试验。对比分析钢筋等体积代换和等强度代换时,纵筋强度、箍筋强度、箍筋间距、混凝土强度等因素对试件破坏机理、抗弯承载力、耗能能力的影响及位移延性等对抗震性能的影响。研究结果表明：采用不同强度钢筋时,试件均为典型的弯曲破坏,墩底形成塑性铰,纵筋断裂;钢筋等体积代换时,纵筋强度对试件承载力、变形能力和总耗能能力影响较大,箍筋强度影响较小;等强度代换时,试件抗震性能基本保持不变,采用高强钢筋可以减小钢筋用量;箍筋间距增大时,箍筋对纵筋约束减小,试件变形能力和耗能能力减弱;混凝土强度对试件抗震性能影响较小。

英文摘要：

In order to investigate the effect of high strength steel on seismic performance of concrete circular columns, 11 reinforced concrete circular column specimens with HRB335, HRB500E and HRB600 steel were conducted quasi-static tests with reversed cyclic loading. With equal volume and equal strength steel replacement, the effects of longitudinal bar strength, stirrups strength, stirrups spacing and concrete strength on seismic performance, such as failure mechanism, flexural capacity, energy dissipation capacity and displacement ductility were compared and analyzed. The results show that the reinforced columns with different strength steel present typical flexural failure mode where column bottom appears plastic hinge, and longitudinal bar buckles and subsequent fractures. Under equal volume steel replacement, longitudinal bar strength has a great effect on bearing capacity, deformability and energy dissipation of concrete columns, while stirrups strength has a little effect. When high strength steel is used to replace columns with different ordinary strength steel with equal strength replacement, the reinforced strength steel have similar seismic performance, resulting in less steel consumption. With the increase of stirrups spacing, the constraint for longitudinal bar provided by stirrups declines, resulting in the decrease of deformability and energy dissipation capacity of concrete columns. The concrete strength has a little effect on seismic performance of concrete columns.