FRP片材粘结加固钢筋混凝土梁的受力分析

发布时间：2018-01-10 01:21

本文关键词：FRP片材粘结加固钢筋混凝土梁的受力分析　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：FRP材料本身具有强度高、自重轻、抗疲劳、耐腐蚀以及施工方便简单等优点,因此目前被应用于混凝土建筑及其它建筑的加固。目前,FRP用于建筑加固的最常用方法是FRP片材粘结加固法,即利用建筑结构胶将FRP片材直接粘结在被加固结构表面。在FRP加固中FRP—混凝土界面是最薄弱的部分,因此较容易发生FRP—混凝土界面的早期剥离破坏。因此,为了避免发生FRP—混凝土界面的早期剥离破坏,有人提出一种新型的FRP片材粘结锚固技术,利用摩擦和胶接的原理,这种新型的粘结锚固加固方法,与其他加固方法比较,有很多突出的优点。本文将利用ANSYS有限元分析软件来对采用新型粘结锚固技术加固钢筋混凝土梁的粘结层进行应力分析,并与单粘结方式加固钢筋混凝土梁的粘结层应力进行对比。其中,混凝土采用非线性本构且考虑开裂和压溃、FRP材料采用线弹性本构、粘结界面采用非线性弹簧,分别采用单粘结加固方法和新型粘结锚固加固方法对钢筋混凝土梁进行加固,并建立FRP加固钢筋混凝土梁有限元分析模型。同时,对新型粘结锚固加固方法进行参数分析并得出一定的结论,为以后相关试验研究以及实际运用提供理论参考。得到的结论如下:(1)通过采取新型锚固加固方法对于提高构件的极限承载力效果很明显;(2)新型锚固加固方法可以增大粘结层的粘结承载力,可以有效地减少FRP产生剥离破坏;(3)新型锚固加固方法与单粘结加固方法对比,前者可以显著提升混凝土试件的界面受力性能;(4)新型锚固加固方法与单粘结加固方法相比更能提高FRP片材的材料利用率。
[Abstract]:FRP material has the advantages of high strength, light weight, fatigue resistance, corrosion resistance and easy construction, so it is currently used in the reinforcement of concrete buildings and other buildings. The most commonly used method of FRP for building strengthening is the method of FRP sheet bonding. That is to say, the FRP sheet is directly bonded to the surface of the strengthened structure by building structural adhesive. In the FRP strengthening, the interface of FRP- concrete is the weakest part. Therefore, the early exfoliation failure of FRP- concrete interface is easy to occur. Therefore, in order to avoid the early exfoliation failure of FRP- concrete interface. Some people put forward a new type of bonding and anchoring technology for FRP sheet, which is compared with other strengthening methods by using the principle of friction and bonding. There are many outstanding advantages. This paper will use ANSYS finite element analysis software to analyze the stress of the bond layer of reinforced concrete beams strengthened by new bond Anchorage technology. And compared with the bond layer stress of reinforced concrete beams strengthened by single bond method, the concrete uses nonlinear constitutive structure and takes linear elastic constitutive law into account of cracking and crushing FRP materials. The nonlinear spring is used in the bond interface, and the single bond strengthening method and the new bond anchoring method are used to reinforce the reinforced concrete beam. The finite element analysis model of reinforced concrete beams strengthened by FRP is established. At the same time, the parameters of the new method of bond anchoring and strengthening are analyzed and some conclusions are drawn. The conclusions are as follows: (1) by adopting new anchoring and strengthening method, the ultimate bearing capacity of members can be improved obviously. (2) the new anchoring and strengthening method can increase the bond bearing capacity of the bond layer and reduce effectively the peeling failure of FRP; 3) compared with the single bond strengthening method, the new Anchorage reinforcement method can significantly improve the interfacial mechanical behavior of the concrete specimen. 4) compared with the single bond method, the new Anchorage strengthening method can improve the material utilization ratio of FRP sheet.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.1

【相似文献】