往复荷载下配置高强钢筋桥墩滞回性能试验

 为研究配置HRB500 高强钢筋的混凝土桥墩的滞回性能, 进行了4 个混凝土桥墩试件的低周往复加载试验, 分析剪跨比、纵筋强度和箍筋强度对混凝土桥墩受力破坏形态的影响, 对比配置高强钢筋桥墩与普通钢筋桥墩, 两者滞回性能的异同。结果表明, 随着箍筋的有效约束下桥墩试件剪跨比的增加, 试件的变形能力增加, 滞回曲线更饱满, 刚度退化减缓。配置高强纵筋及高强箍筋桥墩试件的刚度退化、滞回曲线等滞回特性均优于配置普通钢筋桥墩试件, 同时提高了试件的承载能力及变形能力。

Experimental research of hysteretic behavior of high strength reinforced concrete bridge piers under cycle loading

Four concrete bridge piers are tested under a low cycle loading to study the hysteretic behavior of HRB500 high strength reinforced concrete bridge piers. The effects of the shear span ratio, the longitudinal reinforcement and the stirrup strength grade on concrete bridge pier's failure modes are analyzed. The comparison of the hysteretic behavior between the high strength reinforced concrete bridge piers and the ordinarily reinforced concrete bridge piers shows that with the increase of the shear span ratio and the effective constraint of the stirrup, the deformability is increased, the hysteretic curve becomes fuller and the rigidity degeneration slows down. The hysteretic behavior of the concrete bridge piers with a high strength longitudinal reinforcement and a high strength stirrup, such as the rigidity degeneration and the hysteretic curve, is improved as compared to the ordinarily reinforced concrete bridge piers. The bearing capacity and the deformability of the HRB500 high strength reinforced concrete bridge piers are enhanced.