HRB500钢筋混凝土桥墩承载能力及延性性能研究

Study of Bearing Capacity and Ductility Behavior of RC Bridge Piers Arranged with HRB500 Steel Bars

为研究剪跨比、钢筋强度及箍筋间距对混凝土桥墩承载能力及延性性能的影响,设计了4个混凝土实心墩试件(3个试件配置了HRB500钢筋、1个试件配置了HRB335钢筋),采用拟静力加载方案进行恒定轴压力作用下的低周往复加载试验,分析试件破坏特征、承载能力、延性性能、滞回曲线及耗能能力。研究表明:剪跨比较大的试件呈弯曲破坏形态,剪跨比较小的试件呈弯剪破坏形态;对于剪跨比较大的桥墩,配置HRB500钢筋的试件比配置HRB335钢筋的试件具有更高的承载能力和延性性能,配置HRB500的钢筋能够改善试件的滞回性能;增加箍筋间距能够提高配置HRB500钢筋试件的承载能力和延性性能。

To study the influences of the shear‐to‐span ratios ,steel bar strength and stirrup spacing on the bearing capacity and ductility behavior of reinforced concrete （RC） bridge piers ,4 specimens of the solid RC piers （3 specimens were arranged with the HRB500 steel bars and 1 with the HRB335 steel bars） were designed and prepared .The low‐cycle repeated loading tests were made for the specimens under the constant axial compression ,using the scheme of the quasi‐static loading and the failure characteristics ,bearing capacity ,ductility behavior ,hysteric curves and en‐ergy dissipating capacity of the specimens w ere analyzed .T he results of the analysis indicate that a specimen having the great shear‐to‐span ratio exhibits the flexural failure pattern w hile a specimen having the little shear‐to‐span ratio exhibits the flexural shear failure pattern .As for the RC bridge piers having the great shear‐to‐span ratios ,the specimens arranged with the HRB500 steel bars can have greater bearing capacity and ductility behavior than the specimen with the HRB335 steel bars will have .The arrangement of the HRB500 steel bars can improve the hysteric behavior of the specimens and the increase of the stirrup spacing can improve the bearing capacity and ductility be‐havior of the specimens with the HRB500 steel bars .