拟静力作用下钢筋混凝土桥墩残余位移分析  

Analysis of residual displacement for reinforced concrete piers under pseudo-static load

作　　者：王军文[1,2] 李海洋[1,2] 李建中[3] 

机构地区：[1]石家庄铁道大学土木工程学院,河北石家庄050043 [2]石家庄铁道大学道路与铁道工程安全保障省部共建教育部重点实验室,河北石家庄050043 [3]同济大学桥梁工程系,上海200092

出　　处：《华中科技大学学报（自然科学版）》2015年第9期95-99,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(90815007);河北省自然科学基金资助项目(E2011210028;E2015210038)

摘　　要：为揭示拟静力作用下钢筋混凝土桥墩残余变形的机理,提出精度更高的残余位移计算方法,借助OpenSees软件,采用纤维梁柱单元建立钢筋混凝土桥墩的计算模型,调查了轴压比、剪跨比、纵筋配筋率、体积配箍率、纵筋强度硬化系数、纵筋与混凝土强度比等参数对墩顶残余位移延性指标的影响规律,通过残余位移延性指标拟合出残余位移影响系数随单个参数变化的曲线.在此基础上建立了残余位移影响系数随以上参数变化的预测公式,并通过残余位移预计值与试验值的对比检验了公式的精度.结果表明:预测公式对残余位移的预计值与试验值偏差小于10%,可用于基于性能抗震设计时初步估算拟静力作用下钢筋混凝土桥墩的残余位移值.In order to reveal the mechanism of residual deformation for reinforced concrete （RC） piers under pseudo‐static load and propose a more accurate calculation method of residual displacement , with the fiber beam‐column element ,the calculation model of RC pier was established by Open Sees , and the influences of some parameters on ductility index of residual displacement were investigated , including axial load ratio ,shear‐span ratio ,longitudinal reinforcement ratio ,transverse reinforcement ratio ,strength hardening coefficient of longitudinal reinforcement ,ratio between longitudinal rein‐forcement yield strength and concrete compressive strength .The curve of residual displacement influ‐ence coefficient changing with a single parameter was fit by ductility index of residual displacement . On that basis ,the calculation formula of residual displacement influence coefficient was established , and the accuracy test of this formula was performed by the comparing estimated value of the proposed formula with the pseudo‐static test value .The results show that the estimated residual displacement by the proposed formula has a less than 10% deviation from experimental results ,so the proposed for‐mula can be used for preliminary estimate of residual displacement under pseudo‐static load of RC piers designed by performance based seismic design method .

关 键 词：钢筋混凝土 桥墩 拟静力 残余位移 数值模拟 计算方法 

分 类 号：TU375.3[建筑科学—结构工程]