FRP板与混凝土材料相关选编.docx

摘要  PAGE \* MERGEFORMAT I 河海大学硕士学位论文 摘要 纤维增强复合材料(FRP)广泛应用于钢筋混凝土结构的加固中。它具有应用面广、高强高效、施工便捷、耐久性好等一系列优点。但在诸多因素作用下，FRP加固后的钢筋混凝土梁、板等受弯构件经常会发生FRP与混凝土结构表层的剥离破坏，这大大限制了这一加固技术更广泛的应用。因此，深入研究FRP-混凝土的粘结性能对这一加固技术有重要的意义。 本文详细描述了在自行研制的试验装置上进行的FRP-混凝土试件的纯剪试验和弯剪试验。通过对试验数据和现象的分析，重点研究了FRP板表面应变、界面剪应力沿板长的分布规律以及试件的粘结强度。通过对比纯剪脱粘试验和弯剪脱粘试验结果，揭示了FRP-混凝土界面剥离破坏过程、弯剪共同作用对粘结强度的影响等。并将试验结果与典型的应力-滑移简化模型和陈-滕粘结强度模型进行对比，分析了各模型的优劣。 结果表明：(1)界面剥离破坏一般发生在胶层附近的混凝土层，从加载端开始并向自由端发展，界面的剪应力分布是不均匀的，整个过程为脆性破坏。(2)弯剪共同作用极大地降低了粘结强度，但对界面的剪应力影响不大。(3)应力-滑移简化模型只能大概地模拟应力-滑移曲线的分布。(4)陈-滕粘结强度模型能比较精确地确定FRP的有效粘结长度，但对粘结强度的计算还存在一定的偏差。 关键词：FRP板；纯剪试验；弯剪试验；界面粘结性能；界面模型Abstract  PAGE \* MERGEFORMAT III Abstract  PAGE \* MERGEFORMAT IV Abstract Fiber-Reinforced Polymer(FRP) is widely used in the reinforcement of reinforced concrete structure.It has a series of advantages including wide application,high efficiency,convenient construction,good durability and so on.But under the influence of many factors,FRP reinforcement of reinforced concrete flexural members such as beams and plates often occur debonding in the surface of FRP and concrete structure,which greatly limits its further application of the reinforcement technology.For this reason,In-depth study of FRP and concrete bonding performance has irreplaceable significance to the reinforcement technology. In this paper,pure shear test and flexure-shear test of the FRP-concrete specimens by the self-designed testing device are described in detail.Strain of FRP plates surface,the distribution regularity of interface shear stress along the plate length and the bond strength of the specimens are mainly researched by the analysis of test data and phenomena. The debonding process of FRP-concrete interface and the influence of combined action of flexure and shear on bond strength are revealed by the comparison of the test results of pure shear test and flexure-shear test.Meanwhile,test results are compared with the typical simplified stress-slip model and Chen-Teng bond streng