基于纤维模型的偏心桥墩强震分析

RESPONSE ANALYSIS OF ECCENTRIC PIER UNDER STRONG EARTHQUAKE ACTION BASED ON FIBER MODEL

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。

The analysis of dynamic responses of a reinforced concrete pier with eccentricity based on fiber unit model under strong earthquake was carried out. Through the analysis of damage status of section, residual deformation, the time history of deformation and the strain time history of concrete, the characteristic of the eccentric pier was discussed, when very large one-way deformation and residual deformation occurred in the direction of beam cantilever. It was pointed out that the direction should be considered even if the unidirectional seismic wave was inputted while analyzing the earthquake response of eccentric piers, the input of bidireetional earthquake wave had a great influence on residual deformation.