BFRP管约束再生混凝土圆柱轴压试验  

Axial compressive experiments of recycled concrete cylinders confined by BFRP tube

作　　者：王海涛 陈磊 许国文 熊浩[2,3] 茆亚辉 WANG Haitao;CHEN Lei;XU Guowen;XIONG Hao;MAO Yahui(College of Civil and Transportation Engineering,Hohai University,Nanjing 210098,China;China Construction Eighth Engineering Division Co.,Ltd.,Shanghai 200122,China;Research Center of Shanghai Carbon Fiber Composite Application Technology in Civil Engineering,Shanghai 200122,China)

机构地区：[1]河海大学土木与交通学院,江苏南京210098 [2]中国建筑第八工程局有限公司,上海200122 [3]上海碳纤维复合材料土木工程应用工程技术研究中心,上海200122

出　　处：《河海大学学报（自然科学版）》2023年第6期77-83,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金项目(52378233);中建股份科技研发计划项目(CSCEC-2022-Z-8);上海市科技计划项目(20DZ2253000)。

摘　　要：为研究玄武岩纤维复合材料(BFRP)对再生混凝土力学性能的提升作用,对BFRP管约束再生混凝土圆柱进行了轴压试验,分析了BFRP层数对圆柱轴压性能的影响。试验结果表明:BFRP管约束再生混凝土圆柱的失效模式表现为BFRP断裂引起的圆柱受压破坏,BFRP管约束可以显著提高再生混凝土圆柱的承载力和变形能力,轴压应力-应变曲线表现出明显的强化段。随着BFRP层数的增加,约束再生混凝土的轴压强度比未约束再生混凝土提高了78%~281%,极限轴压应变提高了6.16~18.10倍,均显著高于对应的未约束普通混凝土的轴压强度和极限轴压应变。结合试验数据,评估了典型纤维复合材料(FRP)约束混凝土圆柱轴压强度和极限轴压应变模型在BFRP约束再生混凝土中的适用性,发现所评估的典型模型不能精确地预测试件的轴压强度和极限轴压应变。In order to investigate the improvement effect of the basalt fiber reinforced polymer(BFRP)on the mechanical behavior of recycled concrete,the BFRP tube confined recycled concrete cylinders were tested under axial compression and the effect of the number of BFRP layers on the compressive behavior of cylinders was analyzed.Test results show that the failure mode of BFRP tube confined recycled concrete cylinders is characterized by the rupture of the BFRP followed by the compressive failure of cylinders.The confinement of BFRP tube can significantly increase the ultimate capacity and deformation ability of recycled concrete cylinders,and the axial compressive stress-strain curves exhibit an obvious hardening stage.With an increase in the BFRP layer,the axial compressive strength of confined recycled concrete increases by 78%-281%,and the ultimate axial compressive strain increases by 6.16-18.10 times,compared those of the unconfined recycled concrete.Both the axial compressive strength and ultimate axial compressive strain of the BFRP tube confined recycled concrete are much greater than those of the corresponded unconfined normal concrete.Finally,the applicability of the typical axial compressive strength and ultimate axial compressive strain models of fiber reinforced polymer(FRP)confined concrete cylinders in the BFRP confined recycled concrete was evaluated based on test data,and it is observed that the evaluated typical models cannot provide an accurate prediction in the axial compressive strength and ultimate axial compressive strain of specimens.

关 键 词：BFRP管 再生混凝土 圆柱 约束混凝土 轴压性能 

分 类 号：TU399[建筑科学—结构工程]