FRP网格—钢筋混凝土组合柱基本性能研究
发布时间：2018-08-26 10:55
【摘要】：纤维增强复合材料(FRP)具有轻质、高强、耐腐蚀等优点,在工程领域中有着较为广泛的应用。FRP网格具有轻质、高强、双向受力、施工方便、可用于恶劣环境的施工等优点,目前纤维增强复合材料网格在新建结构中应用较少,其在新建结构中应用的研究亦较少,制约其应用的一个重大因素是网格质量稳定性较差,因而不利于在结构中推广应用。本文将重点研究高性能玄武岩纤维网格高效稳定的制备技术、网格短长期力学性能的评价方法、FRP网格-钢筋混凝土组合柱基本受压性能三个方面,为FRP-钢筋混凝土组合柱的应用提供设计基础。本文对以上问题,研究内容如下：1.本文对FRP网格生产工艺进行了设计与优化,通过网格模具的选择、纤维种类、树脂种类、成型方式等影响网格因素的尝试,最终生产出外观合格、抗拉强度高达900MPa、易弯曲的FRP网格产品；2.通过试验制定出适用于BFRP网格的测试方法；针对网格厚度提出不同的锚固方法以及锚固步骤,即：网格厚度≤1mm,可不制作加强片,直接用砂纸包裹端口即可进行拉伸试验；1mm网格厚度≤2mm,需使用铝片作为加强片：网格厚度2mm,需采用钢管进行锚固；针对不同厚度的BFRP网格拉伸试验,发现随着网格厚度的增长,网格强度逐渐降低；3.通过40℃碱环境下的吸湿称重试验和拉伸强度试验探讨了BFRP网格腐蚀规律,根据试验结果得出了Fick曲线及强度退化公式,较好的预测了BFRP网格在40℃碱环境下的腐蚀退化规律；4.根据纤维复合材料腐蚀原理,将纤维复合材料的强度分为三个阶段：Fick阶段,非Fick阶段1、非Fick阶段2。Fick阶段的腐蚀机理是纤维复合材料树脂吸收腐蚀溶液中OH-而强度退化,退化速率为v1;非Fick阶段1,腐蚀原理为树脂开裂,腐蚀溶液侵蚀内部纤维而强度退化,退化速率为v2;非Fick阶段2,腐蚀原理为纤维与树脂均已发生严重侵蚀,强度基本稳定,退化速率为v3。其中V1v2v3；5.在网格能够满足强度和耐久性的前提下,研制出一种弯曲性能好的网格,该网格可以包裹在新建柱子内部,起到良好的抗裂缝能力,从而保证试件在腐蚀环境中减少裂纹的宽度,延缓腐蚀溶液浸渍内部筋材,起到了良好的耐腐作用。6. 通过48根FRP网格组合柱轴心受压试验,根据试验数据分析纤维网格在组合柱中发挥的作用。通过网格厚度、网格层数、网格包裹柱的高度、网格所在位置、钢筋所在位置、钢筋配筋率等变量参数进行轴压试验,分析各个参量的影响量。从FRP网格组合柱承载能力、延性两个角度分析FRP网格组合柱基本特性。7.基于试验数据拟合出的BFRP网格-钢筋混凝土组合柱极限应力公式,该公式可以为实际工程中FRP网格-钢筋混凝土组合柱提供计算和设计基础。
[Abstract]:Fiber reinforced composite (FRP) has the advantages of light weight, high strength, corrosion resistance and so on. It has been widely used in engineering field. It has the advantages of light weight, high strength, bidirectional force, convenient construction, and can be used in the construction of harsh environment, etc. At present, fiber reinforced composite meshes are seldom used in new structures, and their applications in new structures are also less studied. One of the major factors restricting the application of fiber reinforced composite meshes is the poor stability of mesh quality, which is not conducive to the popularization and application of new structures. In this paper, the preparation technology of high performance basalt fiber mesh with high efficiency and stability, the evaluation method of short and long term mechanical properties of the mesh and the basic compressive performance of FRP mesh-reinforced concrete composite column are studied. It provides a design basis for the application of FRP- reinforced concrete composite columns. In this paper, the contents of the above problems are as follows: 1. In this paper, the design and optimization of FRP mesh production process are carried out. Through the selection of grid mould, fiber type, resin type, molding method and other factors affecting the mesh, the appearance of the mesh is qualified. Tensile strength up to 900MPA, easy to bend the FRP mesh products. Different anchoring methods and anchoring steps are put forward according to the mesh thickness, that is, if the mesh thickness is less than 1mm, the tensile test can be carried out directly by wrapping the port with sandpaper without making the reinforcing plate. When the thickness of 1mm mesh is less than 2 mm, aluminum sheet is used as reinforcing plate, and steel tube is used for anchoring with 2mm mesh thickness. For BFRP mesh tensile test with different thickness, it is found that the mesh strength decreases gradually with the increase of mesh thickness. The corrosion law of BFRP mesh was discussed by the wet gravimetric test and tensile strength test under 40 鈩，
本文编号：2204653
[Abstract]:Fiber reinforced composite (FRP) has the advantages of light weight, high strength, corrosion resistance and so on. It has been widely used in engineering field. It has the advantages of light weight, high strength, bidirectional force, convenient construction, and can be used in the construction of harsh environment, etc. At present, fiber reinforced composite meshes are seldom used in new structures, and their applications in new structures are also less studied. One of the major factors restricting the application of fiber reinforced composite meshes is the poor stability of mesh quality, which is not conducive to the popularization and application of new structures. In this paper, the preparation technology of high performance basalt fiber mesh with high efficiency and stability, the evaluation method of short and long term mechanical properties of the mesh and the basic compressive performance of FRP mesh-reinforced concrete composite column are studied. It provides a design basis for the application of FRP- reinforced concrete composite columns. In this paper, the contents of the above problems are as follows: 1. In this paper, the design and optimization of FRP mesh production process are carried out. Through the selection of grid mould, fiber type, resin type, molding method and other factors affecting the mesh, the appearance of the mesh is qualified. Tensile strength up to 900MPA, easy to bend the FRP mesh products. Different anchoring methods and anchoring steps are put forward according to the mesh thickness, that is, if the mesh thickness is less than 1mm, the tensile test can be carried out directly by wrapping the port with sandpaper without making the reinforcing plate. When the thickness of 1mm mesh is less than 2 mm, aluminum sheet is used as reinforcing plate, and steel tube is used for anchoring with 2mm mesh thickness. For BFRP mesh tensile test with different thickness, it is found that the mesh strength decreases gradually with the increase of mesh thickness. The corrosion law of BFRP mesh was discussed by the wet gravimetric test and tensile strength test under 40 鈩，
本文编号：2204653
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