带纤维锚具的外贴FRP加固RC梁试验研究

发布时间：2018-03-25 11:28

本文选题：FRP　切入点：剥离破坏　出处：《广东工业大学》2014年硕士论文

【摘要】：纤维增强复合材料(Fiber Reinforced Polymer,简称FRP)因其轻质、高强等优点,已经被广泛应用于混凝土及其他结构的加固中。但是外贴FRP加固混凝土构件容易发生早期剥离破坏,导致FRP加固效果降低。相关研究和设计规范建议对外贴FRP片材采用端部锚固系统,从而减缓甚至防止剥离破坏的发生,提高FRP片材的利用率,充分其高强的特点,最终提高加固效果。本文采用一种由FRP缠绕而成的纤维锚具,应用于混凝土梁的抗剪加固试验研究。本文的研究内容主要包括以下两个部分： (1)设计并浇筑了18根小型试验梁,通过小梁试验,专门研究纤维锚具对外贴FRP与混凝土粘结性能的影响。本文系统研究了纤维锚具样式、锚具布置位置、锚具尺寸、锚具数量以及FRP片材宽度对FRP与混凝土粘结性能的影响。试验结果表明,通过合理得布置纤维锚具,可以防止FRP的发生早期剥离破坏,明显提高FRP片材的应变以及试验梁的承载力和延性。 (2)基于上述的小梁试验结果,选择一种优化的纤维锚固措施,用于T型钢筋混凝土梁的受剪加固中,并将之与只外贴FRP U形筋抗剪加固效果进行对比。为了研究抗剪加固梁中带纤维锚具FRP(或外贴FRP)、混凝土以及箍筋三者之间的抗剪相互作用,本文设计了6根跨长为3400mm的足尺T型梁,试验梁分为两组,其中一组试验端不配置箍筋,另一组试验梁配置箍筋；每组试验梁包括一根控制梁,一根U型外贴FRP的加固梁,一根端部布置纤维锚具的外贴FRP加固梁。试验结果表明,纤维锚具可以有效提高试验梁的抗剪承载力和延性,且在有箍筋试验梁中提高作用更为明显。
[Abstract]:Fiber Reinforced Polymer (FRP) has been widely used in the reinforcement of concrete and other structures because of its advantages of light weight and high strength. It is suggested that the end Anchorage system should be used in the application of the FRP sheet, which can slow down or even prevent the breakage, improve the utilization ratio of the FRP sheet, and make full use of the high strength of the FRP sheet. Finally, the reinforcement effect is improved. In this paper, a fiber Anchorage made of FRP is used to study the shear strength of concrete beams. The main contents of this paper include the following two parts:. In this paper, 18 small test beams are designed and poured, and the influence of fiber anchors on the bond between FRP and concrete is studied by trabecular test. This paper systematically studies the type of fiber anchors, the location of anchors, the size of anchors. The effect of the number of anchors and the width of FRP sheet on the bond properties between FRP and concrete. The experimental results show that the early peeling failure of FRP can be prevented by reasonably arranging fiber anchors. The strain of FRP sheet and the bearing capacity and ductility of test beam are improved obviously. 2) based on the above experimental results of trabeculae, an optimized fiber Anchorage method is selected for the shear reinforcement of T-type reinforced concrete beams. In order to study the shearing interaction between fiber Anchorage (or externally affixed FRP, concrete and stirrups) in shear strengthened beams, In this paper, six full-scale T-beams with 3400mm span are designed. The test beams are divided into two groups, one group is not equipped with stirrups at the test end and the other group is equipped with stirrups, each group of test beams includes a control beam and a U-shaped external FRP reinforced beam. The experimental results show that the fiber Anchorage can effectively improve the shear capacity and ductility of the test beam, and the effect is more obvious in the test beam with stirrups.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.1

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