高性能混凝土叠合试件的弯拉性能试验研究  

EXPERIMENTAL RESEACH ON THE FLEXURAL-TENSILE PERFORMANCE OF THE COMPOSITE SPECIMENS WITH HIGH PERFORMANCE CONCRETE AND NORMAL CONCRETE

作　　者：易亚敏 龙广成[1] 谢友均[1] 石晔[1] YI Yamin;LONG Guangcheng;XIE Youjun;SHI Yel(School of Civil Engineering,Central South University,Changsha 410075,China;School of Civil Engineering,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《工业建筑》2018年第10期195-198,164,共5页Industrial Construction

基　　金：国家“973”计划资助项目(2013CB036201)

摘　　要：为掌握微细钢纤维增强高性能混凝土（SFRHPC）对既有混凝土修复加固的效果及性能变化规律,设计制备了2组基准试件和4组不同微细钢纤维增强高性能混凝土与既有基底混凝土叠合试件,分析比较SFRHPC强度等级、钢纤维掺量以及基底混凝土强度等因素对叠合试件的破坏模式、变形协同性、承载力等的影响及其机理。结果表明：相比于基准试件,叠合试件的延性得到大幅度改善,承载力明显提高;同时,叠合试件中SFRHPC与基底混凝土变形协同,加载过程中界面黏结良好。叠合试件的极限弯曲强度与SFRHPC的强度等级及钢纤维掺量密切相关,随着微细钢纤维高性能混凝土强度等级和钢纤维掺量的增加,叠合试件的极限弯曲强度随之提高。In order to study the reinforcement effect and mechanical properties change laws of steel fiber reinforced high/performance concrete （SFRHPC） on the existing concrete components,two sets of comparative specimens and four sets of composite specimens were manufactured. The effects of the SFRHPC strength grade,steel fiber content and the basement concrete strength on the failure mode,deformation synergism and bearing capacity of the composite specimens were analyzed. The test results showed that the ductility and the bearing capacity of the composite specimens were greatly improved. Moreover,the deformation of SFRHPC was in accordance with that of the existing concrete,and the interface was well bonded during the loading process. The ultimate bending strength of the composite specimens was closely related to the SFRHPC strength grade and the steel fiber content,with the increase of the SFRHPC strength grade and the steel fiber volume,the ultimate bending strength increased.

关 键 词：微细钢纤维增强高性能混凝土 既有混凝土 叠合试件 弯拉性能 

分 类 号：TU528[建筑科学—建筑技术科学]