密级：公开
工学硕士学位论文
(全日制)
High-speed RailwayBridgewithLargeDiameter Study onSeismicPerformanceofPrefabricatedPHC Pipe Pile
培养单位：土木工程学院专业领域：桥梁与隧道工程学生姓名：郭 雅校内导师：张彦玲教授
摘要
近年来，预制拼装法在我国基础设施建设中应用逐渐增多，预制PHC管桩、装配式桥墩是两个重要的组成部分，国内外专家学者对其进行了广泛的理论分析与试验研究.本文依托中国铁路总公司科技研究开发计划（P2018G004）《智能京雄关键技术研究》，基于京雄高铁大直径预应力管桩（PHC）试验和装配式桥墩结构性能试验，对装配式桥墩受力性能和地震响应进行分析.主要研究内容及结论如下：
（1）进行了大直径PHC管桩及桩头连接处的静力性能试验，由P-Y法得到了桩各深处土弹簧的参数，对桩-土系统进行了有限元模拟，并进行了参数分析，发现初始预应力和箍筋配筋率对管桩静力性能影响较小，对桩头连接处影响较大：
（2）研究了轴压比、初始预应力和配筋率对PHC管桩桩身抗震性能的影响，发现轴压比应控制在0.35以内，初始预应力应在900~1094MPa和配筋率在0.66%~0.81%内取值，以满足工程需要：研究了预应力筋、螺旋箍筋和锚固钢筋对PHC管桩与承台连接处抗震性能的影响，发现减小预应力钢筋数量和直径、增大箍筋间距会降低结构承载力和耗能能力：
（3）建立了采用灌浆套筒连接的装配墩与现浇墩的有限元模型，并根据足尺模型试验结果进行了校核，对装配试验墩、现浇试验墩、及考虑桩土效应的实际装配墩的滞回曲线、骨架曲线、刚度退化曲线等进行了对比分析，结果表明装配墩和现浇墩抗震性能接近，考虑桩土效应后，初始刚度、耗能和残余变形降低：
（4）建立了分别采用装配墩和现浇墩的两跨简支桥梁模型，选取符合桥梁所在地的三组地震波，研究了两者在多遇地震和罕遇地震作用下的地震响应，发现在多遇地震下，装配墩和现浇墩均处于弹性阶段：在罕遇地震下，位移延性比均满足规范要求.来用装配墩和现浇墩的桥梁地震响应接近，说明装配墩可以满足实际工程中的抗震需要.
关键词：高速铁路：PHC管桩：桩-土效应：静力分析：拟静力分析：装配式桥墩：抗震性能
Abstract
In recent years the application of prefabricated assembly method ininfrastructure construction in China has gradually increased. Prefabricated PHC pipepiles and assembled piers are two important ponents. Experts and scholars athome and abroad have carried out extensive theoretical analysis and experimentalresearch on them. Based on the research and development plan of China RailwayCorporation ( P2018G004 ) ′ Key Technology Research of Intelligent Jingxiong ' thispaper analyzes the mechanical performance and seismic response of assembled piersbased on the test of large diameter prestressed pipe pile ( PHC ) and the structuralperformance test of assembled piers. The main research contents and conclusions areas follows :
(1)The static performance test of large diameter PHC pipe pile and pile headconnection is carried out. The parameters of soil spring at each depth of pile areobtained by P-Y method. The finite element simulation of pile-soil system is carriedout and the parameter analysis is carried out. It is found that the initial prestress andstirrup reinforcement ratio have little influence on the static performance of pipe pile but have great influence on the pile head connection.
(2)The influence of axial pression ratio initial prestress and reinforcementratio on the seismic performance of PHC pipe pile is studied. It is found that the axialpression ratio should be controlled within 0.35 the initial prestress should be 900~ 1094 MPa and the reinforcement ratio should be 0.66 % ~ 0.81 % to meet theengineering needs. The effects of prestressed reinforcement spiral stirrups and anchorreinforcement on the seismic performance of the connection between PHC pipe pileand pile cap are studied. It is found that reducing the number and diameter ofprestressed reinforcement and increasing the spacing of stirrups will reduce thebearing capacity and energy dissipation capacity of the structure.
(3)The finite element models of assembly pier and cast-in-place pier connectedby grouting sleeve are established and checked according to the results of full-scale
model test. The hysteretic curves skeleton curves and stiffness degradation curves ofassembly pier cast-in-place pier and actual assembly pier considering pile-soil effectare pared and analyzed. The results show that the seismic performance ofassembly pier and cast-in-place pier is close and the initial stiffness energydissipation and residual deformation are reduced after considering pile-soil effect.
ds scast-in-place piers was established. Three sets of seismic waves conforming to thelocation of the bridge were selected to study the seismic response of the two under theaction of frequent earthquakes and rare earthquakes. It was found that under frequentearthquakes assembled piers and cast-in-place piers are in the elastic stage ; underrare earthquakes the displacement ductility ratio meets the specification requirements.The seismic response of the bridge using the assembled pier and the cast-in-place pieris close indicating that the assembled pier can meet the seismic needs in the actualproject.
Key words: high-speed railway PHC pipe pile pile-soil impact staticanalysis quasi-static analysis assembly pier seismic performance
目录
第一章绪论.1.1研究背景及意义 11.1.1研究背景. .11.1.2研究目的与意义 .21.2预应力高强混凝土管桩简介 1.2.1预应力高强混凝土管桩的特点， .3 .21.2.2预应力高强混凝土管桩的施工方法 .41.2.3预应力高强混凝土管桩的发展趋势 .51.3预应力高强混凝土管桩研究现状 ..51.3.1国外研究现状 ..1.3.2国内研究现状.. .61.4装配式桥墩研究现状.1.5本文主要内容.. ..8第二章大直径PHC管桩静力性能分析 ...1.02.1引言.. 2.2工程背景及管桩施工工艺 ...10 ..102.2.1工程背景介绍.. ..102.2.2管桩施工工艺介绍. 122.3PHC管桩静力性能试验研究 ..142.3.1试验概况... ..1.2.3.2单桩竖向抗压静载试验 .152.3.3单桩水平承载力试验. ..1.72.4PHC管桩静力性能有限元分析 ..182.4.2桩土弹簧单元. 2.4.1混凝土和钢筋单元. ..19 .222.4.3有限元模型 .272.4.4结果分析 .282.4.5参数分析... ..312.5PHC管桩桩头与承台连接的可靠性试验研究 ..332.5.1结构尺寸. ..332.5.2试验方案... ...342.5.3试验结果. .342.6PHC管桩桩头与承台连接可靠性有限元分析. ...362.6.1建立模型 .36
