钢筋混凝土桥墩地震损伤破坏分析方法

In this paper, taking the maximum crack width of pier concrete, residual displacement, spalling of cover concrete and buckling of longitudinal reinforcement as the main damage and failure indexes, the relationships among ground motion types, intensities and various damage and failure indexes of piers are established. Based on this, an analysis method for seismic damage and failure of reinforced concrete piers is proposed. Finally, taking an actual pier as an example, through incremental dynamic analysis means, the seismic damage indexes such as peak displacement, residual displacement, concrete crack width, spalling of concrete cover and buckling of longitudinal reinforcement under different seismic actions are obtained, and the analysis method for seismic damage and failure of piers is illustrated. The results show that the established numerical analysis method can relatively accurately simulate the post-earthquake residual deformation, concrete cracking and other damage and failure of piers, and the seismic damage and failure of piers under near-fault ground motion input are much greater than those under far-fault ground motion.

本文以桥墩混凝土最大裂缝宽度、残余位移、保护层混凝土脱落及纵筋屈曲为主要损伤破坏指标,建立了联系地震动类型、强度和桥墩各损伤破坏指标之间的关系,并以此为基础提出了钢筋混凝土桥墩的地震损伤破坏分析方法.最终以一个实际桥墩为例,通过增量动力分析手段获得了其在不同地震作用下峰值位移、残余位移、混凝土裂缝宽度、混凝土保护层脱落、纵筋屈曲等地震损伤指标,对桥墩地震损伤破坏分析方法进行了说明.结果表明:所建立的数值分析方法可较为准确的模拟桥墩的震后残余变形、混凝土开裂等损伤破坏,且近断层地震动输入下桥墩的地震损伤破坏远大于远断层地震动.