CFRP-混凝土界面的粘结滑移本构关系及影响因素研究

发布时间：2018-01-24 06:48

本文关键词： CFRP 粘结滑移静力疲劳单、双剪试验　出处：《长沙理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：CFRP作为一种新型材料,以其轻质高强、耐腐蚀性等特点已经被研究者成功运用到土木工程行业,并取得了一定的成果。然而从CFRP加固结构的破坏模式来看,发生CFRP与加固材料的界面剥离是常见的破坏形式,CFRP加固效果与界面粘结性能有着密切的关系。因此在研究FRP-混凝土结构中,CFRP与混凝土界面粘结性能成为研究的重要课题。本文以CFRP-混凝土结构单剪和双剪试验为基础,研究了CFRP-混凝土结构界面静力和疲劳下的界面粘结性能,并讨论关键参数的影响,进而为CFRP-混凝土加固结构提供重要的设计和理论依据。本文主要的研究内容如下：(1)通过CFRP-混凝土单剪试验,研究了不同胶层厚度、混凝土强度、CFRP粘结长度对界面粘结性能的影响,同时拟合得到了界面破坏能、最大剪切应力与胶层剪切刚度及混凝土强度之间的函数关系式。基于T.ueda模型,进行CFRP刚度及界面破坏能修正,从而得到本试验粘结滑移本构关系式。(2)从影响界面粘结滑移的三个重要参数(初始界面剪切刚度、局部最大界面剪切应力、界面破坏能)出发,利用有限元分析考察三个重要参数对界面粘结性能的影响,同时保持三个重要参数不变,考察粘结滑移曲线形状对界面粘结性能影响。(3)以陆新征粘结滑移承载力模型为基础,结合了本试验得到的界面破坏能公式,对CFRP刚度进行了修正,考虑有效粘结长度、宽度修正系数在内的影响,以期得到修正性的考虑多种影响极限承载力因素的承载力计算公式。(4)通过CFRP-混凝土双剪疲劳试验,以双线性粘结滑移简化模型为基础,基于疲劳试验结果,拟合不同循环次数下界面初始刚度、残余滑移值、粘结剪应力与循环次数N的关系。进而获得不同循环次数下的界面粘结滑移本构关系式。
[Abstract]:As a new material, CFRP has been successfully applied to civil engineering industry for its characteristics of lightweight, high strength, corrosion resistance and so on. Some achievements have been made. However, from the view of the failure mode of CFRP strengthened structure, the interface peeling between CFRP and strengthening material is a common failure form. The strengthening effect of CFRP is closely related to the bond behavior of interface. Therefore, in the study of FRP- concrete structure. The interface bond behavior between CFRP and concrete has become an important research topic. This paper is based on single shear and double shear tests of CFRP- concrete structure. The interfacial bond behavior of CFRP- concrete structure under static and fatigue conditions is studied, and the influence of key parameters is discussed. Then provide important design and theoretical basis for CFRP- concrete reinforced structure. The main research content of this paper is as follows: 1) through CFRP- concrete single shear test, the different thickness of adhesive layer is studied. The influence of concrete strength and CFRP bond length on the interfacial bond properties is also studied. At the same time, the interface failure energy is obtained by fitting. Based on T.ueda model, the CFRP stiffness and interface failure energy can be corrected. Thus, the bond-slip constitutive relation of this test is derived from three important parameters (initial interface shear stiffness, local maximum interfacial shear stress, interface failure energy) that affect the interface bond-slip. The influence of three important parameters on the bond performance of the interface is investigated by finite element analysis, while the three important parameters are kept unchanged. The influence of the shape of bond-slip curve on the interfacial bond behavior was investigated. The stiffness of CFRP was modified based on the new bond-slip bearing capacity model and the formula of interfacial failure energy obtained in this experiment. The effect of effective bond length and width correction coefficient is considered. Through the double shear fatigue test of CFRP- concrete, based on the simplified model of bilinear bond-slip. Based on the fatigue test results, the relationship between the initial stiffness, residual slip value, bond shear stress and cycle number N of the interface under different cycles is fitted, and the constitutive equation of interface bond slip under different cycles is obtained.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU377

【参考文献】