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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。
In order to study the effect of corrosion caused by chloride ions on the seismic performance of existing bridge piers, the cylindrical pier was taken as an example to determine the initial corrosion time and corrosion rate of steel bars by the probabilistic method, and then the degradation model of the diameter and yield strength of rebars was established. ABAQUS software is used to establish the nonlinear dynamic analysis model. In view of the unilateral consideration of the longitudinal reinforcement corrosion or stirrups corrosion and the corrosion of both, the change of the seismic performance of the bridge piers caused by material deterioration is analyzed. The results show that considering both the stirrups and longitudinal tendons corrosion ratio, the anti-seismic performance of the bridge piers is seriously deteriorated only when the longitudinal reinforcement corrosion is considered. The longitudinal reinforcement corrosion seriously affects the flexural performance of the reinforced concrete piers. The stirrups corrosion seriously affects the RC Ductility performance.