变幅反复荷载作用下变形钢筋与混凝土间的黏结退化  

Bond Degradation between Deformed Reinforcement and Concrete under Variable Repeated Loads

作　　者：程宏远 马金尧 郑丹[2] 程文百合 李鑫鑫[2] CHENG Hongyuan;MA Jinyao;ZHENG Dan;CHENGWEN Baihe;LI Xinxin(Zhejiang Branch of Zhongshui Zhujiang Planning Survey and Design Co.,Ltd.,Hangzhou 311500,China;School of River and Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Hangzhou Highway Engineering Supervision and Consulting Co.,Ltd.,Hangzhou 310013,China)

机构地区：[1]中水珠江规划勘测设计有限公司浙江分公司,浙江杭州311500 [2]重庆交通大学河海学院,重庆400074 [3]杭州公路工程监理咨询有限公司,浙江杭州310013

出　　处：《人民珠江》2024年第6期92-99,共8页Pearl River

基　　金：国家自然科学基金(51809025)。

摘　　要：反复荷载下钢筋与混凝土间的黏结滑移本构模型是震后钢筋混凝土结构整体性能评估及加固修复的重要依据。由于黏结应力主要由变形钢筋与混凝土间的机械咬合力所组成,黏结区域侧向约束状态会对其黏结性能产生影响。基于此,研究了在侧向压力作用下变幅反复荷载对钢筋与混凝土黏结性能的影响,定量分析了黏结参数随变幅反复荷载的退化规律,并利用数字图像技术分析了钢筋与混凝土间的黏结破坏机理。研究表明,在混凝土保护层充分约束条件下,钢筋与混凝土间的黏结退化主要与反复荷载控制位移有关,而侧向压力对其影响可忽略。The bond-slip constitutive model between reinforcement and concrete under repeated loads is an important basis for the assessment of the overall performance of reinforced concrete structures and reinforcement repair after earthquakes.Since the bond stress is mainly composed of the mechanical occlusion force between deformed reinforcement and concrete,the lateral confinement state in the bond region will affect its bond performance.On this basis,this paper investigated the effect of variable repeated loads under lateral pressure on the bond performance between reinforcement and concrete,quantitatively analyzed the degradation law of bond parameters with variable repeated loads,and studied the bond damage mechanism between reinforcement and concrete by using digital image technology.It is shown that under the condition of sufficiently restrained concrete protective layer,the bond degradation between reinforcement and concrete is mainly related to the displacement controlled by repeated loads,while the effect of lateral pressure on it is negligible.

关 键 词：侧向压力 反复荷载 黏结退化 数字图像技术 混凝土 

分 类 号：TV131.6[水利工程—水力学及河流动力学]