Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"crack widths"”.
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Bending behavior of concrete T-beams reinforced with glass fiber-reinforced polymer (GFRP) bars
… modes, deformability factors, pre- and post-cracking deflections and crack widths at first crack and at ultimate failure of T-beams.;Eight concrete T-beams with two different flange widths and two reinforcement configurations were tested under four point bending to study the factors cited …
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Measurable parameters for performance of correded and repaired RC beams under load
… Parameters that were looked at were corrosion crack widths and longitudinal strains together with their derivatives.
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Examination of flexural crack width prediction in concrete: comparison of analytical and numerical models
The reliability of crack prediction methods in concrete design plays a role in the degree of confidence with which durability can be ensured. Bond failure between concrete and the embedded reinforcing steel exposes the steel surface within a crack path. This relative slip results from differential …
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Corrosion performance of coated steel bars in cracked and uncracked reinforced concrete beams
… enhanced bonding to concrete thereby reducing cracking within transportation bridge deck systems. It aims to improve upon conventional smooth epoxy-coated reinforcing bar (ECR) by providing a multi-layered thicker and texturized coating. Where the texturized surface aims to improve the bond …
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Deterioration and Cracking in Reinforced Concrete Bridges
… of the internal steel reinforcement and cracking of the concrete cover. Thus, half-joints are particularly vulnerable to bond degradation due to corrosion and cracking. To develop an improved understanding of deterioration in reinforced concrete, and half-joints in particular, three …
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Laboratory Tests of a Bridge Deck Prototype With Glass Fiber Reinforced Polymer Bars as the Top Mat of Reinforcement
… and deck, such as failure load, failure mode, cracking load, crack widths, deflections, and internal stresses, were examined. Four tests were performed on the deck, all of which tested the deck in negative moment regions. From the tests, it was concluded that the design of the deck was very …
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Digital State Models for Infrastructure Condition Assessment and Structural Testing
… to traditional sensors (e.g., digital caliper, crack microscope, wire potentiometer). Overall, features measured from the 3D point clouds data presented a maximum error of ±0.10 in. (±2.5 mm); and surface features (i.e., crack widths) measured from the texture information in textured polygon …
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Field observations of the early-age behavior of jointed plain concrete pavements
… to develop non-uniform, transverse saw-cut joint-crack developments and extensive slab movement behaviors, which cause unwanted premature joint failures. Phase I of this study determined the variables associated with the sporadic, large joint opening development by literature review, laboratory …
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Strength and Performance of Steel Fiber Reinforced Concrete Post-Tensioned Flat Plates
… bay and overhang section. Throughout the test, crack widths, crack locations, deflections, concrete strains, and reinforcing bar strains were monitored. The post-tensioned flat plate was designed to just meet the maximum allowable stress requirements of ACI 318. Minimal quantities of hairline …
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C-Grid as Shear Reinforcement in Concrete Bridge Girders
… instrumentation to capture initiation of shear cracking. Shear capacity calculations following four methods were compared to test results. The design method should follow the AASHTO modified compression field theory with equations for β and θ. The manufacturer's guaranteed strength should be …
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Performance Assessment of Shear-critical Reinforced Concrete Plane Frames
… load-deflection response, reinforcement strains, crack widths, failure mode, failure displacement, total energy dissipation, displacement ductility ratio, and post-peak vibrational characteristics.
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Numerical modelling of time-dependent cracking and deformation of reinforced concrete structures
For a structure to remain serviceable, crack widths must be small enough to be acceptable from an aesthetic point of view, small enough to avoid waterproofing problems and small enough to prevent the ingress of water that may lead to corrosion of the reinforcement. Crack control is therefore an …
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Model-based optimization of ultra high performance concrete highway bridge girders
… test. The UHPC model is combined with maximum crack width criteria, which aptly define the Service Limit State (SLS) and the Ultimate Strength Limit State (ULS) of UHPC structures, to yield a three step design strategy for UHPC bridge girders: 1) 1-D section design models suffice for initial …
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Shear Strength and Strength Degradation of Concrete Bridge Decks with GFRP Top Mat Reinforcement
… data was collected on deflections, rebar strain, crack widths, and ultimate load. It was concluded that the existing equations, particularly the guidelines of ACI 440, are grossly over-conservative for GFRP-reinforced concrete bridge decks continuous over multiple supports. It was suggested that …
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DEVELOPMENT AND APPLICATION OF SMART CARBON-BASED COATINGS FOR MULTIFUNCTIONAL SENSING OF CEMENTITIOUS STRUCTURES
… environments, up to average crack widths (116 ± 45 μm or 33 ± 3 μm) inversely proportional to the distance from the corroding steel. When monitoring self-healing substrates, autogenous and bacteria-driven processes reduced coating’s resistivity, while polyurethane foam and …
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Comparative study on the behaviour of concrete reinforced with FRP and steel singly reinforced beams
… concrete reinforced with FRP. Its failure modes, crack width and patterns, and deformation of the reinforcing material. The experimental work consisted of testing a total of 5 simply supported beams, each tested under four-point loading until failure. One beam consisted of steel reinforcement, …
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Development, application and early-age monitoring of fiber-reinforced ‘crack-free’ cement-based overlays
… of durability in repairs, early-age shrinkage cracking in overlay materials is of utmost importance. Fiber-reinforcement can be used to alleviate some of the issues related to plastic shrinkage. However, quantifying the performance of cement-based composites under restrained shrinkage …
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Ductility and deformability of FRP strengthened reinforced concrete structures
… forewarning of impending failure.<br/><br/>The crack patterns of strengthened elements vary considerably from un-strengthened ones, particularly with respect to beams. Cracks in strengthened members tend to be smaller and narrower, with an increased crack density. Additionally, cracks in …
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The development of empirical chloride-induced corrosion rate prediction models for cracked and uncracked steel reinforced concrete structures in the marine tidal zone
… corrosion rate prediction models for cracked and uncracked reinforced concrete (RC) structures in the marine tidal exposure zone are proposed in this study. The data used to develop the models were obtained from parallel corrosion experiments carried out by exposing half of 210 beam …
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