基于Pushover的双柱墩桥梁抗震延性能力分析  

Analysis of Ductile Anti-seismic Capacity of Bridge with Double-column Bent Based on Pushover Analysis

作　　者：王文科[1] 李雪红[1] 徐秀丽[1] 史春[1] 梁志雯 

机构地区：[1]南京工业大学土木工程学院,江苏南京211816

出　　处：《工程抗震与加固改造》2015年第5期75-81,69,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：江苏省科技支撑计划项目(BE2014716);江苏省"六大人才高峰"项目资助;江苏省交通科学研究计划项目(2012Y11)

摘　　要：针对混凝土连续梁桥,采用Pushover分析方法,对影响桥墩延性能力的混凝土强度、纵筋、箍筋等主要参数进行定量的研究。结果表明:在研究参数取值范围内,混凝土强度等级从C45到C60,位移延性系数减小了近60%,建议设计时混凝土强度在C45以下选取;在相同纵筋配筋率条件下,相比采用HRB335钢筋、HRB400钢筋时的墩柱位移延性系数平均增幅在30%左右,建议纵向钢筋选择HRB400钢筋;在相同配箍率条件下,取较小箍筋间距比取较大箍筋直径的延性效果更好,在满足构造要求及所需配箍率的条件下,箍筋间距尽量取小值。分析横桥向延性时,考虑轴力变化影响得到的位移延性系数与按照平均轴力计算的位移延性系数相差在5%以内。The main parameters that affect the ductile capacity of RC continuous girder bridge like concrete strength, longitudinal reinforcement, stirrup is quantitative researched based on pushover analysis method. Within the scope of parameters in this paper, when the concrete strength changes from C45 to C60,the displacement ductility factor reduces almost 60%. Therefore, the concrete strength grade is recommended under C45 in the design. When the reinforcement ratio is the same,column＇ displacement ductility factor with HRB400 increases by an average of about 30% compared to HRB335. When the volume-stirrup ratios is the same,columns＇ ductility with arrangement of lesser space between hoops is better than bigger diameter of stirrup. The space between hoops is better to take a small value having satisfied the construction requirements and the required volume-stirrup ratios. The calculation result of the displacement ductility factor based on dynamic axial force is close to that based on average axial force, and the quantitative difference is within 5 percent,when analyzing the ductility in the lateral direction.

关 键 词：位移延性系数 双柱墩 PUSHOVER分析 影响因素 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]