UHPC加固混凝土圆柱轴压性能试验研究  

Experimental study on the axial compression behavior of RC cylinders strengthened with UHPC

作　　者：卢春玲[1,2,3,4] 欧阳康 王强 Lu Chunling;Ouyang Kang;Wang Qiang(College of Civil Engineering,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Rock-soil Mechanics and Engineering,Guilin 541004,China;Guilin University of Technology,Collaborative Innovation Center for Exploration of Hidden Nonferrous Metal Deposits and Development of New Materials in Guangxi,Guilin 541004,China;Guangxi Engineering Research Center of Intelligent Structural Material,Guilin 541004,China)

机构地区：[1]桂林理工大学土木与建筑工程学院,广西桂林541004 [2]广西岩土力学与工程重点实验室,广西桂林541004 [3]桂林理工大学广西有色金属隐伏矿床勘查及材料开发协同创新中心,广西桂林541004 [4]广西壮族自治区智慧结构材料工程研究中心,广西桂林541004

出　　处：《建筑科学》2023年第3期108-117,共10页Building Science

基　　金：国家自然科学基金项目(51568015);广西自然科学基金面上项目(2019GXNSFAA245055);广西创新驱动发展专项(桂AA20302006);广西重大科技创新基地建设项目(2018-242-G02)。

摘　　要：为研究超高性能混凝土(UHPC)加固钢筋混凝土(RC)圆柱的轴压性能,本文对1根未加固柱和3根加固柱进行了轴压性能试验研究,探究UHPC护套厚度及护套中是否配置箍筋对加固后的RC圆柱的影响,对加固试件轴压性能改善和其破坏机理进行分析和研究,同时对试件轴向承载力进行理论分析。结果表明:UHPC护套加固可有效提高试件的轴向承载力和延性,承载力提高幅度随UHPC厚度的增加而增大,但其延性提升幅度会随之降低;UHPC中加入箍筋可提高试件承载力和延性;建立了以约束混凝土理论为基础的轴向承载力计算模型,结果与试验值吻合良好。In order to study the axial compression performance of strengthened reinforced concrete(RC)cylinders strengthened with ultra-high performance concrete(UHPC),an experimental study on the axial compression performance of one unstrengthened column and three strengthened columns is conducted,the effects of the thickness of UHPC jackets and the configuration of stirrups in the jackets on the strengthened RC cylinders are investigated,and the improvement of the axial compression performance of the strengthened specimens and their damage mechanism are analyzed and studied.At the same time,the axial bearing capacity of the specimen is theoretically analyzed.The results show that:UHPC jacket reinforcement can effectively improve the axial load capacity and ductility of the specimen,and the increase of load capacity increases with the increase of UHPC thickness,but the increase of ductility decreases;the addition of stirrups in UHPC can improve the load capacity and ductility of the specimen;an axial load capacity calculation model based on the theory of confined concrete is established,and the results are in good agreement with the test values.

关 键 词：UHPC 螺旋箍筋 轴压性能 钢筋混凝土柱 

分 类 号：TU375.3[建筑科学—结构工程]