加筋填芯预应力高强混凝土管桩-承台节点拉弯受力性能分析  

Mechanical Properties Analysis of Core Reinforced Concrete-Filled Pile-Cap Joint Under Tensile-Bending Load

作　　者：刘华清 安增军 刘佳龙 李媛媛[4] 蔡建国[4] LIU Huaqing;AN Zengjun;LIU Jialong;LI Yuanyuan;CAI Jianguo(China Electric Power Research Institute,Beijing 100192,China;Economic Research Institute,State Grid Jiangsu Electric Power Company,Nanjing 210008,China;Jiangsu Electric Power Design Consulting Co.,Ltd.,Nanjing 210008,China;National Prestress Engineering Research Center,Southeast University,Nanjing 211189,China)

机构地区：[1]中国电力科学研究院有限公司,北京100192 [2]国网江苏省电力有限公司经济技术研究院,南京210008 [3]国网江苏电力设计咨询有限公司,南京210008 [4]东南大学国家预应力工程技术研究中心,南京211189

出　　处：《工业建筑》2022年第6期12-18,共7页Industrial Construction

基　　金：国家电网有限公司总部科技项目(5200-201918118A-0-0-00)。

摘　　要：预应力高强混凝土(PHC)管桩-承台连接节点处于复杂受力环境,其受力机理亟待深入研究。基于ABAQUS建立不截桩加筋填芯混凝土桩-承台节点模型,对其在拉弯联合加载工况下的受力机理进行研究,验证数值模拟过程的合理性,并考察了管桩嵌入深度和承台高度对节点各部件应力分布、混凝土损伤及荷载-位移曲线的影响。研究结果表明:采用有限元数值模拟得到的加筋填芯桩-承台节点的荷载-位移曲线、管桩桩身和承台的损伤与试验结果吻合;随着管桩嵌入深度和承台高度的增加,节点的初始刚度和承载力显著提高;当管桩嵌入深度较小时,节点的刚度下降主要是由预应力筋、锚筋的屈服和混凝土部件的损伤引起的;当管桩嵌入深度较大或承台高度较小时,节点整体刚度的下降是由混凝土部件的损伤引起的。The PHC pipe pile-cap joint is in a complex stress environment,and its mechanical mechanism needs to be further studied.ABAQUS finite element software was used to establish the calculation model of core reinforced concretefilled pile-cap joint,and the mechanical mechanism of the joint under the combined loading condition of tension and the bending moment was studied.The effects of the embedded depth of pile,the height of cap on the stress distribution and the tensile capacity of the pile were investigated.The calculation results showed that the load-displacement curves of core reinforced concrete-filled pile-cap joint and the damage characteristics of pipe pile and cap calculated by finite element analysis were close to the experimental results.With the increase of pile embedment depth and cap height,the initial stiffness and bearing capacity of the joint increased significantly.When the embedded depth of pipe pile was small,the stiffness of joint was mainly caused by the yield of prestressed reinforcement,anchor reinforcement and the damage of concrete components.When the embedded depth of pipe pile was large or the height of cap was small,the overall stiffness of joint was decreased due to the damage of concrete components.

关 键 词：PHC管桩 桩-承台节点 加筋填芯 有限元分析 参数分析 

分 类 号：TU473.1[建筑科学—结构工程]