Author: Lu, Tianhui
Title: Design and finite element simulation of a novel FRP rebar connector under tensile load
Advisors: Zhou, Limin (ME)
Degree: M.Sc.
Year: 2020
Subject: Fiber reinforced plastics
Reinforced concrete construction
Polymeric composites
Hong Kong Polytechnic University -- Dissertations
Department: Department of Mechanical Engineering
Pages: xiii, 91 pages : color illustrations
Language: English
Abstract: Fiber reinforced polymer (FRP) rebar has been widely used for civil and marine engineering due to its excellent mechanical properties, such as high tensile strength and good fatigue resistance. However, the common methods of connecting FRP bars always cost a lot of time and lead to corrosion problems. With the increasing demand for FRP rebar, an FRP rebar connector (FRPRC) which includes wedges and a tube has been developed to prevent corrosion and quickly connect the FRP rebars. In this work, finite element models for FRP bar connector were developed. The relationship between displacement load and variables was studied and the parameters of the newly developed FRP connector were optimized for the first time by orthogonal design. The main research contents and results are as follows: The displacement curves of connectors were designed with different length variables. The results show the length of the tube is more important than other variables for the displacement load. The shorter tube and the smaller thickness of the thicker ends of the wedges can consume the smaller displacement load. The minimum displacement load can be calculated from the end thickness of the tube and angle difference between one wedge and the tube, respectively. The larger the length of 0° fiber of the tube is, the smaller the displacement load is. A series of parameter sets have been computed to obtain the smallest displacement load. By studying the influence of various dimensional variables on displacement load, the optimized variables and their range were adjusted, the plan of orthogonal optimization of FRP bar connectors was established, and the order of the effect of displacement loads on FRP bar connectors could be calculated by orthogonal design. The results of orthogonal optimization design were analyzed by intuitive analysis and variance analysis. In the intuitive analysis, the scoring standard was determined and each group of results was scored to obtain the optimal solution by giving each index the importance coefficient. In the variance analysis, the significance of factors was measured by calculating the variance. It was found that F<Fα, indicating that the change of variables had no significant effect on the experimental indicators. The optimal values of each variable were selected as a new parameter group for verification. The obtained result was compared with the optimal solution of the intuitive analysis method. Finally, the optimal solution in the intuitive analysis method was regarded as the optimal one in the orthogonal optimization design solution.
Rights: All rights reserved
Access: restricted access

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