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基于纤维单元模型,对在横桥方向存在偏心的钢筋混凝土桥墩进行了强震作用下的动力反应分析。通过对断面损伤状态、残余变形、变形反应时程、混凝土应变反应时程分析,探讨了偏心桥墩在横梁悬挑方向产生很大的单向变形和残余变形的特点。指出在进行偏心桥墩的地震反应分析时单向输入地震波也应考虑输入方向,双向输入地震波对残余变形有较大影响。
Based on the model of fiber unit, the dynamic response analysis of reinforced concrete piers with eccentricity in the transverse direction under strong earthquake was carried out. Through the analysis of the damage status, residual deformation, deformation reaction time history and concrete strain response time history, the characteristics of eccentric pier in unidirectional and residual deformation of cantilever beam are discussed. It is pointed out that the input direction should also be taken into account when one-way input seismic waves are used in seismic response analysis of eccentric piers, and the input of seismic waves with two-way input has a great influence on the residual deformation.