| Author: | Ngan, Hoi Hon |
| Title: | Development of innovative connection forms for FRP-SSC structures by auxetic and lattice structure |
| 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: | xx, 121 pages : color illustrations |
| Language: | English |
| Abstract: | In this dissertation, innovative form of connection for FRP rebar with auxetic and lattice structure is developed, and the mechanical behavior of the connector is studied with finite element method in ABAQUS. For civil structure use, Fibre-reinforced polymer (FRP) rebars are twice strength than steel rebars. Steel is majority used to reinforcement concrete structure in civil engineering nowadays. However, corrosion problem and life span of steel-reinforced concrete are concerned, because alternative solution proposed and FRP materials is one of the possible solutions of that. FRP bars show excellent corrosion resistance and high strength-toweight ratios. Seawater and Sea-sand concrete (SSC) structures reinforced with fibrereinforced polymer (FRP) composites (referred to as FRP-SSC structures) are also proposed. However, corrosion problem comes badly in SSC with its chloride content comparing to trinational concrete, making steel could not be or not an ideal material in reinforcement the SSC. The splice method of rebar becomes a concern when metal is not suitable in SSC environment since majority existing mechanical splice is made by metal material. When seawater and sea-sand used together with fibre reinforced polymer composites, a new connector made of composite material with auxetic (i.e. negative Poisson's ratio) and lattice structure is proposed for that purpose. The metal-free and strength connector is made together with carbon and glass fiber composites and applicate in the FRP-SCC structure environment dealing with corrosion problem. The quick connection method without threaded or grout can save time since auxetic and lattice structure is applied in the connection and easy-to-use on-site. An auxetic and lattice structure connector is designed to connect the FRP rebar. The connection formed by a carbon-fibre made outer tube and two glass-fibre made auxetic and lattice structure tube. In auxetic and lattice structure, the inner wall is under a shear load and inclined truss props up and expand when the rebar is pulled. The direction of expansion of the auxetic and lattice structure tube is limited by the outer tube and thus to clamp the rebar tighter when the pulling force of rebar greater. The function of auxetic and lattice structure are important to clamp the FRP bars and the outer tube hold the rebar together. Finite element model is built in ABAQUS environment and the connector is simulated by displacement load. Different diameter of rebar and inclined angle of truss is modeled in the FEM, and the thickness of each component is studied. The relationship between the thickness and the resultant stress of rebar is also be studied. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 5237.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 14.98 MB | Adobe PDF | View/Open |
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