BFRP网格加固钢筋混凝土桥面板基本性能研究

发布时间：2018-04-29 13:28

本文选题：FRP网格 + 聚合物水泥砂浆　；参考：《东南大学》2015年硕士论文

【摘要】：桥面板是直接承受车辆轮压和各种腐蚀介质侵蚀的构件,随着使用时间的增加极易发生材料的老化与结构的损伤等问题,因此大量桥面板需要进行承载力和耐久性加固。纤维复合材料(Fibre Reinforced Polymer,简称FRP)是一种轻质高强的高性能材料,聚合物砂浆粘贴FRP网格加固法相对于传统粘钢加固基本不增加结构自重并且耐腐蚀,相对于纤维布加固更能提高构件刚度并且不易出现剥离破坏,而且由于施工成本较低、加固性能优异,显示出良好的应用前景。但FRP网格加固法因FRP网格的制备工艺未能实现标准化,同时加固工法未能完善,所以加固效果离散性大。另外,传统加固材料碳纤维网格成本过高,而价格低廉的玻璃纤维网格存在蠕变大等问题,也约束了FRP网格的推广应用。因此,结合近年来重点研发的玄武岩纤维网格,对标准化网格制备,规范化网格增强进行了系统研究。本文具体开展了以下几个方面的工作：1、为解决FRP网格生产过程中出现的节点及尺寸控制等问题,本文在现有模压成型生产工艺的基础上进行优化,对纤维规格、树脂种类和模具等进行改进并取得了较好的效果,成品FRP网格的抗拉强度和弹性模量相对于传统产品得到大幅提升,满足结构使用要求。2、聚合物水泥砂浆的种类及其力学性能对加固效果影响较大,本文在分析水泥砂浆原材料的基础上,通过系统试验选定聚合物水泥砂浆配合比,其抗压、抗折强度及粘结性能相比普通水泥砂浆均得到较大提高。3、通过对FRP网格进行双剪试验研究其粘结性能。试验考察了FRP网格纤维材料(玄武岩纤维/玻璃纤维)、FRP网格厚度(1mm/3mm/5mm)、聚合物水泥砂浆种类(NBS丙乳砂浆/HPM-S钢丝绳网片加固用聚合物砂浆)和界面处理方式(凿毛和涂刷界面剂)等因素对粘结性能的影响,试验表明：相同厚度下采用BFRP网格加固的构件粘结强度较大；相同材料的网格厚度越大,粘结性能越强；HPM-S砂浆加载过程中裂缝细而密,NBS丙乳砂浆裂缝少而宽,NBS砂浆加固构件粘结强度较大；凿毛处理和涂刷界面剂能够有效提高粘结性能,防止发生界面粘结破坏。4、在以上研究的基础上,本文通过5块聚合物砂浆FRP网格加固板和1块对比板的抗弯试验,研究了纤维材料、网格厚度、网格层数、和加固砂浆种类对加固性能的影响。试验结果表明：加固后试验板的开裂荷载、极限荷载和刚度均得到了明显提高,相同荷载下,裂缝宽度和挠度得到了有效控制。相同厚度下BFRP网格加固比GFRP网格加固的构件极限承载能力高；相同纤维材料时,网格厚度越大,加固效果越好；另外,砂浆涂抹厚度对加固板抗弯承载能力有一定的影响,NBS丙乳砂浆加固构件的极限承载力略大于HPM-S砂浆加固构件。5、对聚合物砂浆FRP网格加固桥面板的抗弯性能进行理论分析,得出适用于加固构件抗弯承载力和开裂荷载的计算方法,与试验实测结果相比较,误差控制在15%以内,证明所用计算方法较为符合实际情况。
[Abstract]:The bridge deck is a component that directly bears the wheel pressure of the vehicle and the corrosion of various corrosive media. With the increasing use time, it is very easy to occur the aging of materials and the damage of the structure. Therefore, a large number of bridge panels need to be strengthened with bearing capacity and durability. Fiber composite material (Fibre Reinforced Polymer, short for short, FRP) is a kind of lightweight high strength high Performance materials, polymer mortar bonded FRP mesh reinforcement method has no weight and corrosion resistance to the traditional steel bonded reinforcement. Compared with the fiber cloth strengthening, it can improve the stiffness of the component and not be easily stripped, and it has a good application prospect because of low construction cost and good strengthening performance. But FRP grid is added. Due to the failure to standardize the preparation technology of the FRP grid, the reinforcement effect is not perfect, so the reinforcement effect is very discrete. In addition, the cost of the traditional reinforced carbon fiber grid is too high and the low price glass fiber grid has a large creep, which also restricts the popularization and application of the FRP grid. The basalt fiber grid has been studied systematically for standardized grid preparation and standardized grid enhancement. The following work has been carried out in this paper. 1, in order to solve the problems of node and size control in the process of FRP grid production, this paper optimizes the fiber gauge on the basis of the existing molding process. The type of resin, resin type and mould have been improved and achieved good results. The tensile strength and modulus of elasticity of the finished FRP mesh have been greatly improved compared with the traditional products, which meet the requirements of the structure use.2. The types and mechanical properties of the polymer cement mortar have a great effect on the reinforcement effect. This paper analyzes the base of the raw material of cement mortar. On the base of the system test, the mixture ratio of polymer cement mortar was selected. The compressive, flexural strength and bonding properties of the cement mortar were greatly improved by.3. The bonding performance of the FRP grid was studied by double shear test. The FRP mesh fiber material (basalt fiber / glass fiber) and FRP mesh thickness (1mm/3mm/5mm) were tested. ) the effect of polymer cement mortar (NBS acrylic mortar /HPM-S steel wire mesh reinforced polymer mortar) and interface treatment (chisel and brush interface agent) on bonding properties, the test shows that the bond strength of the members strengthened with the same thickness is larger, the greater the thickness of the same material, the bonding property of the same material. The stronger it can be, the cracks are fine and dense during the loading process of HPM-S mortar, the crack of NBS LC mortar is less and wider, and the bond strength of the NBS mortar reinforcement is larger, and the bonding properties of the chisel and the coating agent can be effectively improved and the interface bond is prevented from breaking the.4. On the basis of the above research, 5 blocks of polymer mortar with FRP grid reinforcement board are used in this paper. The effect of fiber material, mesh thickness, number of grid layers, and the types of reinforced mortar on the strengthening performance of 1 contrast plates are studied. The test results show that the cracking load of the reinforced test plate, the limit load and the stiffness are obviously improved, and the crack width and deflection are effectively controlled under the same load. The same thickness is the same thickness. The ultimate bearing capacity of the lower BFRP grid reinforcement is higher than that of the GFRP mesh. The greater the thickness of the mesh, the better the reinforcement effect. In addition, the thickness of the mortar coating has a certain effect on the flexural capacity of the reinforced plate. The ultimate bearing capacity of the NBS propyl mortar reinforced component is slightly greater than that of the HPM-S mortar reinforced component.5. The flexural performance of the reinforced concrete gridding FRP gridding plate is theoretically analyzed, and the calculation method suitable for the flexural capacity and cracking load of the reinforced component is obtained. Compared with the experimental results, the error is less than 15%, which proves that the calculation method is more in line with the actual situation.

【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U443.31;U445.72

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