DOI: 10.15986/j.1006-7930.2020.03.002
为研究除冰盐环境下在役RC桥墩结构抗震性能时效性.以我国北部地区某高速路段在役RC桥墩氯离子含量检测数据为基础,考虑氯离子扩散系数的时变性,构建适用于除冰盐环境下的氯离子扩散修正模型,并结合氯离子侵蚀对材料性能劣化的影响,进行在役RC桥墩时效地震易损性分析,计算地震作用下桥墩达到或超过某种特定损伤状态的失效概率.结果表明:在相同的地震作用下,随服役时间的增加,桥墩达到或超过某种特定损伤状态下的失效概率显著增大; 桥墩从严重破坏至完全破坏的过渡延性最优,即桥墩在达到严重破坏时不会快速倒塌.
In order to study the timeliness of seismic performance of in-service RC bridge pier structures in deicing salt environment, Based on the chloride ion content detection data of the in-service RC bridge pier in a highway section in northern China, Considering the time variability of the chloride diffusion coefficient, Construct a modified chloride ion diffusion model suitable for deicing salt environment, and combine the effects of chloride ion erosion on the degradation of material properties to perform ageing seismic vulnerability analysis of active RC bridge pier. Calculate failure probability of bridge pier reaching or exceeding a certain damage state under earthquake. The results show that under the same earthquake, With the increase of service time, the probability of failure of a bridge pier reaching or exceeding a certain damage state increases significantly. The ductility of the bridge pier from severe damage to complete damage is optimal, that is, the bridge pier will not collapse quickly when it reaches severe damage.
