粘结长度及胶层厚度影响下的CFRP-混凝土结构界面粘结疲劳性能研究

发布时间：2018-03-20 19:44

本文选题：FRP板材　切入点：粘结　出处：《长沙理工大学》2013年硕士论文　论文类型：学位论文

【摘要】：FRP复合材料以及其在土木工程加固中的应用已经成为了土木工程领域中最前沿的课题之一。由于FRP复合材料具有较高的强重比和刚重比、良好的耐久性、施工便捷等特点，从而使之成为了国内外的研究人员和工程师们进行研究和分析的热点问题。现在研究者对外贴FRP加固不同类型混凝土结构的粘结界面静力性能展开了深入的研究，但是针对粘结界面的疲劳性能尚未进行深入而有效的研究，尤其是在基于不同敏感性参数条件下的粘结界面的疲劳退化规律和典型的失效破坏模式方面存在较大的分歧。本文建立在CFRP外贴加固素混凝土单面剪切构件的基础上，采用了简单的素混凝土双面剪切构件作为试验中外贴加固载体，同时选取了粘结长度和胶层厚度作为研究变量，进行了2个单调静载试验和5个疲劳试验的研究，主要的研究工作如下：（1）通过分析沿板长方向上不同位置CFRP-混凝土粘结界面应变和自由端粘结界面滑移量在疲劳循环过程中的变化情况，讨论了基于不同的粘结长度和胶层厚度条件下的粘结界面疲劳退化规律；（2）通过分析不同疲劳后静载试验以及单调准静载试验中沿板长方向上CFRP-混凝土粘结界面应变和自由端粘结界面滑移量在单调静力加载过程中的变化情况，讨论了基于不同的粘结长度和胶层厚度条件下的粘结界面疲劳后静载性能以及典型的粘结界面失效破坏模式；（3）分别采用了简化的粘结界面损伤力学模型、Cheng-Teng关于粘结强度的力学模型和ANSYS有限元模型，分析了基于不同粘结长度以及胶层厚度条件下的粘结界面静力性能和疲劳损伤性能。
[Abstract]:FRP composite material and its application in civil engineering reinforcement have become one of the most advanced topics in civil engineering field. Because FRP composite material has the characteristics of high strength weight ratio and rigid weight ratio, good durability, convenient construction, etc. Therefore, it has become a hot issue for researchers and engineers at home and abroad to study and analyze. Now researchers have carried out in-depth research on the static behavior of bonding interface of different types of concrete structures strengthened with FRP. However, the fatigue behavior of bonding interface has not been studied deeply and effectively. Especially, there are great differences in the fatigue degradation law of bond interface and the typical failure failure mode based on the different sensitive parameters. This paper is based on the reinforcement of plain concrete single-side shear members with CFRP. A simple plain concrete double-sided shear member is used as the test carrier, and the adhesive length and the thickness of the adhesive layer are selected as the research variables, and two monotonic static load tests and five fatigue tests are carried out. The main research work is as follows:. 1) by analyzing the strain of CFRP- concrete bond interface and the slip of free end bond interface in different positions along the long direction of slab, the variation of CFRP- concrete interface slip at free end during fatigue cycle is analyzed. The fatigue degradation law of bond interface is discussed under the condition of different bonding length and thickness of adhesive layer. (2) the variation of CFRP- concrete bond interface strain and free end bond slip during monotonic static loading in different fatigue tests and monotonic quasi static load tests along the long direction of the slab is analyzed. The static load behavior of bond interface after fatigue and the typical failure mode of bond interface are discussed based on different bonding length and thickness of adhesive layer. In this paper, a simplified mechanical model of bond interface damage and a ANSYS finite element model on bond strength are used, respectively. The static and fatigue damage properties of bond interface are analyzed based on the different bond lengths and the thickness of the adhesive layer.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU37

【参考文献】