考虑锈蚀钢筋黏结退化的多跨连续梁桥地震损伤分析

Seismic Damage Analysis of Multi-span Continuous Beam Bridge Considering Bond Degradation of Corroded Steel Bars

以四跨连续梁桥为工程背景,文中建立全桥地震响应数值模型,考虑黏结滑移效应对桥梁的影响。针对不同工况,即是否考虑墩底纵筋的黏结滑移效应,以及考虑墩底锈蚀钢筋的黏结滑移效应,评估桥墩的损伤状态。并研究考虑黏结滑移效应和考虑锈蚀钢筋混凝土黏结滑移效应对在役混凝土桥墩地震响应的影响,探讨对四跨多跨连续梁桥地震损伤的影响。结果显示,在考虑黏结滑移效应和钢筋锈蚀的情况下,桥梁的滞回耗能减弱,损伤程度减轻,但钢筋锈蚀会加剧墩柱的受损程度,导致抗震性能进一步下降。综合分析发现,在纵向地震中,黏结滑移效应对桥墩的影响较大,通过合理的配筋和箍筋布置可以实现纵横向差异化设计,以达到预期的抗震性能。

Based on a four-span continuous beam bridge as the engineering background,a numerical model for the seismic response of the entire bridge is established,and the influence of bond-slip effects on the bridge is taken into consideration.For different working conditions,namely,with or without considering the bond-slip effects of the longitudinal reinforcement at the bottom of the pier,and considering the bond-slip effects of the corroded reinforcement at the bottom of the pier,the damage state of the bridge piers is evaluated.In addition,the effects of bond-slip effects and bond-slip effects of corroded reinforcement on the seismic response of in-service concrete bridge piers are studied,and the influence on the seismic damage of the four-span continuous beam bridge is explored.The research results show that,when considering bond-slip effects and reinforcement corrosion,the hysteresis energy dissipation of the bridge is weakened,and the damage level is reduced.However,reinforcement corrosion exacerbates the damage of the piers,leading to further reduction in seismic performance.Comprehensive analysis reveals that under longitudinal earthquake actions,the bond-slip effects have a significant impact on the piers,and differentiated design in both longitudinal and transverse directions can be achieved through rational reinforcement and stirrup layout to achieve the expected seismic performance.