摘要
钢筋与混凝土之间良好的界面黏结性能是二者协同工作的基础,对钢筋混凝土结构承载和安全极其重要。为了研究钢筋与混凝土之间的非线性黏结失效机理,考虑钢筋与混凝土之间的摩擦力和机械咬合力,以及月牙肋的表面特征,采用三维扫描的方式建立了带肋钢筋-混凝土三维精细有限元模型,并通过拔出试验对比验证了数值模型的准确性。在此基础上,研究了钢筋-混凝土界面黏结-滑移行为与破坏机理,讨论了该文所提方法的优势。结果表明:界面黏结强度随混凝土强度增大而线性增大;钢筋直径的增大会导致界面黏结强度逐渐减小,并导致试件破坏模式的改变;数值模拟结果与试验结果吻合较好,说明采用三维扫描建立的数值模型可以准确模拟筋材与混凝土之间的黏结失效行为,进而从细观层面上揭示界面黏结失效机理。
The good interfacial bonding performance between steel rebars and concrete is the foundation for their collaborative work,and is crucial for the load-bearing capacity and safety of reinforced concrete structures.To study the mechanism of the nonlinear bonding failure between steel rebars and concrete,the fine finite element model for ribbed steel rebars and concrete is established by a 3D scanning approach,and the accuracy of the numerical model was verified by the comparison with the pull-out test,considering the frictional resistance and the mechanical interlocking between steel rebars and concrete as well as the surface characteristic of crescent ribs.On this basis,the bond-slip behavior and damage mechanism of the steel rebars and concrete interface were investigated,and the advantages of the method proposed were discussed.The analysis results show that the interfacial bond strength increases linearly with the concrete strength.The increase of steel diameter leads to the gradual decrease of interfacial bond strength and changes the failure mode of specimens.The numerical results agree well with the experimental observations,indicating that the numerical model established by 3D scanning can accurately simulate the bond failure behavior between rebars and concrete,and the interfacial bond failure mechanism can be revealed at the mesoscale level.
作者
杨犇
章子华
周春恒
王轩
张振文
YANG Ben;ZHANG Zi-hua;ZHOU Chun-heng;WANG Xuan;ZHANG Zhen-wen(School of Civil&Environmental Engineering and Geography Science,Ningbo University,Ningbo 315211,China)
出处
《工程力学》
EI
CSCD
北大核心
2024年第S01期215-221,共7页
Engineering Mechanics
基金
国家自然科学基金项目(52378162)
浙江省省属高校基本科研业务费专项资金项目(SJLZ2023003)。
关键词
带肋钢筋
混凝土
黏结破坏
三维扫描
数值模拟
ribbed steel bar
concrete
bond failure
3D scanning
numerical simulation
