基于钢筋锈蚀的RC桥墩抗震性能

为研究氯离子侵蚀效应引起的钢筋锈蚀对在役桥墩抗震性能的影响,以圆柱形桥墩为例,通过概率方法确定钢筋初始锈蚀时间、锈蚀速率,进而建立钢筋直径及屈服强度的退化模型;采用ABAQUS软件建立非线性动力分析模型,针对单方面考虑纵筋锈蚀或箍筋锈蚀以及同时考虑两者锈蚀3种情况,分析材料劣化引起桥墩抗震性能的变化。结果表明:同时考虑箍筋、纵筋锈蚀比只考虑纵筋锈蚀时桥墩的抗震性能退化明显;纵筋锈蚀严重影响钢筋混凝土桥墩的抗弯性能;箍筋锈蚀严重影响RC(reinforced concrete)桥墩的延性性能。

Seismic performance of RC pier with reinforcement corrosion

In order to study the seismic performance of the reinforced concrete bridge piers in service, which was affected by the reinforcement corrosion due to the chloride ion corrosion, a cylindrical pier was taken as an example. By means of probability method, the initial corrosion time and the corrosion rate were determined, the deterioration models of the diameter and the yield strength of steel were established. The nonlinear dynamic analysis model was made by ABAQUS software and three analysis cases as consisting of stirrup corrosion, longitudinal reinforcement corrosion and the combination corrosion of deterioration, were investigated to study the seismic performance of reinforced concrete piers caused by material deterioration. The results showed that compared with only considering the corrosion situation of longitudinal reinforcement in the past, the deterioration of seismic performance was more serious when the stirrups and longitudinal reinforcement corrosion were both considered, the ductility performance of the bridge pier was affected seriously by the stirrup corrosion and the bending performance of the bridge pier was affected seriously by the longitudinal reinforcement corrosion.