高延性混凝土与带肋钢筋黏结性能试验研究  

EXPERIMENTAL STUDY ON BOND BEHAVIOR BETWEEN HIGH DUCTILE CONCRETE AND RIBBED STEEL BAR

作　　者：邓明科[1,2] 范洪侃 马福栋 刘俊超 张伟[1] DENG Ming-ke;FAN Hong-kan;MA Fu-dong;LIU Jun-chao;ZHANG Wei(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an,Shaanxi 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education(XAUAT),Xi’an,Shaanxi 710055,China;Shanghai Key Laboratory of Engineering Structure Safety Shanghai Academy of Building Science Co.,Ltd.,Shanghai 200032,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055 [3]上海市建筑科学研究院有限公司上海市工程结构安全重点实验室,上海200032

出　　处：《工程力学》2023年第3期78-87,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(51878545);西安市重大科技创新计划项目(20191522415KYPT015JC017)。

摘　　要：为研究高延性混凝土(HDC)与带肋钢筋的黏结性能,设计制作了20组试件。通过中心拔出试验,研究单调和重复荷载作用下试件的破坏形态及黏结滑移破坏机理,分析了HDC的抗压强度、纤维掺量、纤维种类及保护层厚度对带肋钢筋与HDC黏结性能的影响。结果表明:单调与重复荷载作用下,普通混凝土试件发生了脆性劈裂破坏,HDC试件发生劈裂和拔出破坏;试验结果表明,带肋钢筋与HDC的黏结强度随HDC抗压强度增加而提高;相同HDC抗压强度时,纤维掺量的增加可改善带肋钢筋与HDC的黏结性能;相比PP纤维,相同体积掺量的PE纤维与PVA纤维可有效限制混凝土内部径向裂缝的开展,提高带肋钢筋与HDC的黏结强度;依据破坏形态和黏结强度,得出临界相对保护层厚度为2.0;单调与重复荷载作用下,试件黏结强度比由纤维种类和相对保护层厚度主导,残余黏结强度比由抗压强度和纤维掺量主导;根据试验结果,建立了带肋钢筋与HDC的黏结强度计算公式和黏结-滑移本构模型。In order to study the bond performance between high ductility concrete(HDC)and ribbed bars,20groups of specimens were designed and manufactured.Through the center pull-out test,the failure mode and bond-slip failure mechanism of specimens under monotonic and repeated loads were studied,and the effects of compressive strength,of fiber content,of fiber types and of protective layer thickness of HDC on the bond performance between ribbed steel bars and HDC were analyzed.The experimental results show that:under monotonic and repeated loads,brittle splitting failure occurs in ordinary concrete specimens,and splitting and pulling-out failure occurs in HDC specimens.The test results also show that the bond strength between ribbed steel bars and HDC increases with the increase of HDC compressive strength.When the compressive strength of HDC is the same,the increase of fiber content can improve the bonding performance between ribbed steel bars and HDC.Compared with PP fiber,PE fiber and PVA fiber with the same volume content can effectively limit the development of radial cracks in concrete and improve the bond strength between ribbed steel bars and HDC.According to the failure mode and bond strength,the critical relative protective layer thickness is 2.0.Under monotonic and repeated loads,the bond strength ratio of specimens is dominated by fiber types and relative protective layer thickness,while the residual bond strength ratio is dominated by compressive strength and fiber content.According to the test results,the bond strength calculation formula and bond-slip constitutive model between ribbed bars and HDC are established.

关 键 词：高延性混凝土 带肋钢筋 重复荷载 中心拔出试验 黏结性 

分 类 号：TU502[建筑科学—建筑技术科学]