This research investigates bond between concrete and steel in reinforced concrete (RC) using X-Ray tomography image data and nonlinear analysis, with the objective of developing recommendations for modeling bond in RC structures. RC is a composite material that combines concrete, which is strong in compression and weak in tension, with reinforcing steel, which is strong is tension and buckles in compression. Bond is necessary to maintain the composite action and realize the full utility of the material. However, bond-zone response data are not easily collected and the mechanics of bond are not easily assessed using traditional experimental test methods, as traditional instrumentation may interfere with the bond mechanism and can not provide high-fidelity data. Recently, X-ray computed tomography (CT), which is non-invasive and provides high resolution data, has been used to monitor bond tests. Tim this study, state-of-the-art image processing techniques are applied to 3D X-ray images of bond-zone specimens to characterize bond behavior. Bond-zone response data generated from X-ray CT images are used to verify nonlinear high-resolution finite element (FE) modeling of bond-zone specimens. These FE models are used to further investigate bond-zone response and the impact of modeling parameters on predicted response. The results of this research provide high-fidelity data characterizing bond-zone response, improved understanding of bond-zone mechanisms and recommendations for design and modeling of bond behavior in RC structural components.
|Advisor:||Lowes, Laura N.|
|School:||University of Washington|
|School Location:||United States -- Washington|
|Source:||DAI-B 71/10, Dissertation Abstracts International|
|Keywords:||Bond, Bond-zone responses, Finite elements, Reinforced concrete, Steels|
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