预应力混凝土空心墩拟静力试验与数值分析  

Quasi-Static Tests and Numerical Analysis of Prestressed Concrete Hollow Pier

作　　者：王军文[1] 张伟光[2] 李建中[3] 

机构地区：[1]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 [2]济南铁路局聊城工务段,山东聊城252000 [3]同济大学桥梁工程系,上海200092

出　　处：《桥梁建设》2015年第3期63-69,共7页Bridge Construction

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

摘　　要：为研究预应力混凝土空心墩的抗震性能,对4个空心墩模型进行拟静力试验研究,并基于试件的破坏特征、滞回性能等试验结果,利用OpenSees软件,采用纤维梁柱单元模拟各空心墩在拟静力荷载下的力学行为,对比分析预应力混凝土整体式空心墩、装配式空心墩与钢筋混凝土空心墩的拟静力行为。结果表明:在钢筋混凝土空心墩中配置竖向无粘结后张预应力筋,可提高其刚度与水平抗力,增强滞回曲线的捏缩效应,减小残余位移,对累积滞回耗能影响不大;与整体式空心墩不同,添加耗能钢筋的预应力装配式空心墩没有出现明显的塑性铰区,曲率分布和剪切错动主要集中在墩底接缝处,滞回曲线呈明显的捏缩状,损伤程度较轻,其刚度、累积滞回耗能分别约为钢筋混凝土空心墩的100%、73%;建议的模型和方法能较准确地预测预应力空心墩的拟静力行为。To study the seismic performance of prestressed concrete （PC） hollow pier ,the quasi‐static tests for the 4 hollow pier models were made .Based on the tests of the damage charac‐teristics and hysteretic behavior of the pier specimens ,the mechanical behavior of each pier subjec‐ted to the quasi‐static load w as simulated by the fiber beam‐column element ,using the OpenSees software and the quasi‐static behavior of the monolithic PC hollow pier ,precast segmental PC hol‐low pier and reinforced concrete （RC） hollow pier was compared and analyzed .The results of the analysis demonstrate that the arrangement of the vertical unbonded post‐tensioning bars in the RC hollow pier can improve the stiffness and horizontal resistance capacity of the pier ,increase the pinching effect of the hysteretic curves and decrease the residual displacement ,but will not cause great influence on the cumulative hysteretic energy dissipation .Unlike the monolithic PC hollow pier ,the precast segmental PC hollow pier added with the energy dissipation bars does not have the obvious plastic hinge zone .T he curvature distribution and shear deformation mainly concen‐trate in the joint of the pier footing ,the hysteretic curves exhibit the obvious pinching state ,the damage to the pier is slight and the stiffness and cumulative hysteretic energy dissipation respec‐tively accounts for about 100% and 73% of those of the RC hollow pier .The proposed models and method in this paper can be used to accurately predict the quasi‐static behavior of the PC hol‐low pier .

关 键 词：预应力混凝土结构 空心墩 装配式桥墩 拟静力试验 模型试验 有限元法 纤维单元模型 数值分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程] TU317.1[交通运输工程—道路与铁道工程]