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对10个配置HRB335、HRB500E、HRB600钢筋的混凝土矩形截面柱进行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和等强度代换时,纵筋强度、箍筋强度、混凝土强度等因素对试件破坏状态、滞回曲线、骨架曲线、受弯承载力及延性性能的影响。结果表明:配置不同强度钢筋的矩形截面柱试件均发生典型的弯曲破坏,柱底形成塑性铰,纵筋断裂,试件具有较好的变形能力和延性性能;钢筋等体积代换时,纵筋强度对试件承载力和变形能力影响较大,箍筋强度影响较小;钢筋等强度代换时,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;随着混凝土强度的提高,试件刚度增大,导致屈服位移减小,位移延性系数增大。
The quasi-static tests of 10 rectangular columns with HRB335, HRB500E and HRB600 rebar under horizontal low-cycle loading were carried out. When the equal-volume and equal-intensity substitution of reinforcing bars were compared, the longitudinal strength, stirrup strength, Strength and other factors on the specimen failure state, hysteresis curve, the skeleton curve, the flexural capacity and ductility of the impact. The results show that all the rectangular columns with different strength have typical bending failure, the plastic hinge and the longitudinal reinforcement are broken at the bottom of the column, and the deformation and ductility properties of the specimens are good. The strength of the tendons has a great influence on the bearing capacity and deformation capacity of the specimens, but the strength of the stirrups is less affected. When the strength of the stirrup alternates, the seismic performance of the specimen remains basically unchanged. The use of high strength steel can reduce the amount of steel. With the increase of concrete strength Increase the specimen stiffness, resulting in reduced yield displacement, displacement ductility coefficient increases.