纤维网增强混凝土复合材料约束混凝土应力-应变关系研究  

Study on stress-strain relationship of concrete confined with textile reinforced concrete composites

作　　者：张勤[1,2] 李三亚 赵永胜 周继凯 ZHANG Qin;LI Sanya;ZHAO Yongsheng;ZHOU Jikai(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;Key Laboratory ofOcean Energy Uilization and Energy Conservation of Ministry of Education,Dalian University of Technology,Dalian116024,China;Faculty of Civil Engineering and Mechanics,Jiangsu University,Zhenjiang 212013,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]大连理工大学海洋能源利用与节能教育部重点实验室,辽宁大连116024 [3]江苏大学土木工程与力学学院,江苏镇江212013

出　　处：《建筑结构学报》2021年第4期166-176,共11页Journal of Building Structures

基　　金：国家重点研发计划课题(2017YFC0404902);国家自然科学基金项目(51508154,51678104);中央高校基本业务费项目(B210202033)。

摘　　要：为研究纤维网增强混凝土(TRC)加固层对混凝土柱的约束性能,对13根混凝土柱试件(包括10根TRC加固柱和3根对比柱)进行了轴心受压试验,分析了纤维网层数、短切纤维及混凝土强度对TRC加固效果的影响,基于试验结果提出了TRC约束混凝土应力-应变关系简化计算模型。研究结果表明:TRC加固可改善混凝土柱的轴压破坏形态;与未加固柱相比,TRC加固柱的承载能力和变形能力有不同程度提高,且提高幅度与纤维网层数、混凝土强度以及短切纤维掺入相关,纤维网层数越多、混凝土强度越低时,加固柱的承载力和延性提高幅度越大,最高可分别达67.3%和65.2%;TRC基体中掺入短切纤维有利于加固柱的承载力和延性提高;提出的TRC约束混凝土应力-应变关系计算模型与试验结果吻合较好,可用于描述TRC约束混凝土应力-应变关系曲线。In order to study the confinement performance of concrete columns strengthened with textile reinforced concrete(TRC), 13 concrete column specimens, including 10 column specimens strengthened with TRC and 3 control column specimens, were tested under axial load, and the influences of the number of textile layers, chopped fiber sand and concrete strength on reinforcement effects of TRC were analyzed. Based on experimental results, the simplified calculation model for the stress-strain relationship of TRC confined concrete columns was proposed. The results indicate that the failure mode of concrete column strengthened with TRC under axial load has been improved. Compared with the unstrengthened columns, the bearing capacity and deformation capacity of columns strengthened with TRC are improved, and the extent of improvement is related to the number of textile layers, concrete strength and the incorporation of chopped fibers. The bearing capacity and ductility of the strengthened column exhibit more increment with more increase of textile layers and less strength of concrete, and the maximum increasement can be up to 67.3% and 65.2%, respectively. The bearing capacity and ductility of strengthened columns are improved with the incorporation of chopped fibers into TRC matrix. In addition, the proposed stress-strain relationship models can be used to describe the stress-strain relationship of TRC confined concrete columns well, and the predicted results are in good agreement with the experimental results.

关 键 词：纤维网增强混凝土 加固混凝土柱 轴压试验 轴压性能 应力-应变关系 

分 类 号：TU375.303[建筑科学—结构工程]