Repair and Strengthening of Reinforced Concrete Shear Walls for Earthquake Resistance Using Externally Bonded Carbon Fibre Sheets and a Novel Anchor System [microform] PDF Download
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Author: Stylianos Hiotakis
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612939394
Category : Carbon fibers
Languages : en
Pages : 502
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![Repair and Strengthening of Reinforced Concrete Shear Walls for Earthquake Resistance Using Externally Bonded Carbon Fibre Sheets and a Novel Anchor System [microform] PDF](https://books.google.com/books/content/images/frontcover/9RcIugEACAAJ?fife=w80-h100)
Author: Stylianos Hiotakis
Publisher: National Library of Canada = Bibliothèque nationale du Canada
ISBN: 9780612939394
Category : Carbon fibers
Languages : en
Pages : 502
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Author: Sara Honarparast
Publisher:
ISBN:
Category :
Languages : en
Pages : 195
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Author: Rico Massa
Publisher:
ISBN:
Category :
Languages : en
Pages :
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" Shear resistance deficiencies can arise after the construction of concrete members due to many causes including deterioration, load increases and severe damage. When replacement of these members is undesirable or cost-prohibitive, strengthening and rehabilitation is necessary. One technique which can be used for this purpose is the application of externally bonded fibre reinforced polymers (FRP). This is often used on prestressed concrete I-girders, but few experimental studies have been conducted to understand the behaviour of FRP shear strengthening on these types of members. This thesis presents the results of beam tests conducted on full-scale precast pretensioned I-girders to study the influence on the shear response of carbon fibre reinforced polymer (CFRP) shear strips. The test program demonstrated that the CFRP strengthening was effective in increasing the shear strength of the webs and in controlling the shear crack widths. The shape of the I-girders makes it difficult to properly anchor the vertical shear strips to prevent debonding which often results in extremely brittle failures. Curved epoxy transitions between the web and the flanges at the re-entrant corners, together with the use of horizontal CFRP strips helped to improve the anchorage of the vertical shear strips. The shear resistance components from the concrete, stirrups and CFRP shear strips were determined experimentally and compared with analytical predictions. The design approach of the 2014 Canadian Highway Bridge Design Code provides conservative estimates of the shear strength of the webs." --
Author:
Publisher: American Concrete Institute
ISBN: 0870313134
Category : Concrete construction
Languages : en
Pages : 148
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"This CD-ROM consists of eight papers that were presented by ACI Committee 440 at the Spring Convention in Atlanta, GA, in April 2007"--Site Web de l'éditeur
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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In Canada, as in many other parts of the world, the deterioration of einforced and prestressed concrete bridges and parking garage structures has reached alarming proprtions. Many of these structures face very expensive rehabilitation work or outright replacement. Although strengthening reinforced concrete structures using externally bonded or bolted steel plates is a technology that is not widely known in North America, a number of structures in Europe, Australia, and South America have been rehabilitated using this method. the weight of the steel plates, which makes them difficult to handle in the field, and their susceptibility to corrosio have led to research into the possibility of replacing steel plates with high strength fibre composite sheets. Fibre reinforced composite sheets are composed of carbon, glass, or aramid fibres, bound by a resin epoxy. In addition to being light in weight, these materials do not corrode. Very recently, a few bridges have been repaired in Europe using carbon fibre and glass fibre reinforced plastic sheets. This paper reviews the case studies and research pertaining to the use of steel plates and fibre composite sheets to strengthen and repair reinforced concrete flexural members.
Author: Riadh Al-Mahaidi
Publisher: Butterworth-Heinemann
ISBN: 0128115114
Category : Technology & Engineering
Languages : en
Pages : 413
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Rehabilitation of Concrete Structures with Fiber Reinforced Polymer is a complete guide to the use of FRP in flexural, shear and axial strengthening of concrete structures. Through worked design examples, the authors guide readers through the details of usage, including anchorage systems, different materials and methods of repairing concrete structures using these techniques. Topics include the usage of FRP in concrete structure repair, concrete structural deterioration and rehabilitation, methods of structural rehabilitation and strengthening, a review of the design basis for FRP systems, including strengthening limits, fire endurance, and environmental considerations. In addition, readers will find sections on the strengthening of members under flexural stress, including failure modes, design procedures, examples and anchorage detailing, and sections on shear and torsion stress, axial strengthening, the installation of FRP systems, and strengthening against extreme loads, such as earthquakes and fire, amongst other important topics. Presents worked design examples covering flexural, shear, and axial strengthening Includes complete coverage of FRP in Concrete Repair Explores the most recent guidelines (ACI440.2, 2017; AS5100.8, 2017 and Concrete society technical report no. 55, 2012)
Author: Applied Technology Council
Publisher:
ISBN:
Category : Buildings
Languages : en
Pages : 556
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Author: Rami Nassar
Publisher:
ISBN:
Category :
Languages : en
Pages : 268
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ABSTRACT: The enclosed work focuses on shear strengthening of reinforced concrete beams with carbon fiber sheets. The use of composite materials is increasing in rehabilitation of concrete structural elements. The advantages over concrete are high strength to weight ratio and high resistance to corrosion over steel structures. Over time, concrete beams lose their strength due to corrosion of the reinforcement inside the beam. To replicate this condition in the field, research on concrete beams was performed and experimental tests and analytical investigations were conducted to prove the validity of the research. Several T-shape rectangular beams were tested, and they were externally reinforced with carbon fiber. The bonding of the material to the concrete surface, the surface preparation, and the orientation of the fiber were important factors in strengthening the beam in shear. Two samples were tested in as-build conditions. Four other samples were externally reinforced with carbon fabric composite sheets. By applying the carbon externally, significant improvement on the shear strength of the concrete beam was achieved. Samples were modeled in a finite element (FE) program, ABAQUS, to verify the actual conditions acting on the beam during testing. The FE results were found to be similar to the experimental findings.
Author: Mansour Navidpour
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Reinforced concrete shear walls as seismic force resisting systems may experience inelastic deformations if subjected to strong seismic excitations. These walls are designed to provide strength, stiffness, energy dissipation capacity and lateral drift control for seismic resistance. Shear wall deformability is largely dependent on adequate confinement of core concrete in boundary elements, prevention of longitudinal bar buckling, as well as proper design and detailing of the web section. Conventional transverse reinforcement placed in shear wall boundary elements consists of hoops, overlapping hoops and crossties, based on the geometry and number of longitudinal bars used. The confinement steel requirement of current building codes (ACI 318 or CSA A23.3) often results in congestion of steel cage due to the high transverse reinforcement ratio required. Placing multiple hoops with 135-degree bends combined with crossties to satisfy the code confinement requirements can create concrete placement and construction problems. In addition, the required time to assemble conventional steel cages with multiple individual ties per spacing can be time consuming, potentially impacting the overall cost and duration of construction. Welded Wire Reinforcement (WWR) is available in the construction industry as concrete reinforcement in the form of welded wire fabric (WWF) manufactured from relatively small diameter wires in comparison to the bar sizes typically used in structural applications. As an alternative to using conventional transverse hoops, prefabricated WWR grids can be used to provide required transverse reinforcement in boundary elements. WWR grids are manufactured using robots to weld cut steel pieces accurately before they are shipped to the job site, resulting in better construction quality and reduced construction time. However, research on the use of WWR is limited in the literature. Further experimental and analytical research is needed to establish design requirements for such reinforcement, especially when used in earthquake resistant construction with requirements for ductile response. The current research project, involved three main phases; i) tests of 3 large-scale reinforced concrete shear walls with WWR grids used as boundary element transverse reinforcement, ii) material tests of grid samples, including those cast in concrete, iii) non-linear finite element analysis. The wall tests were conducted under slowly-applied lateral deformation reversals to investigate their strength and ductility for suitability as seismic resistant structural elements. Material tests were conducted to have a better understanding of WWR behavior, especially their weld capacity. Analytical research was undertaken to expand the experimental findings on shear wall behavior, as well as to conduct parametric investigation to understand the impact of changes in grid strength and ductility. The results indicated that WWR grids can be used as boundary element transverse reinforcement in earthquake resistant shear wall. However, strength and ductility of grids should be established carefully prior to such application. Design strength of WWR grids should be established through burst tests to ensure ductile yielding of wire reinforcement prior to premature weld failure. Those grids that exhibit weld failures may be used with reduced design strength to permit the development of sufficient inelastic deformability in flexure-dominant shear walls.
Author: Ali Rezaiefar
Publisher:
ISBN:
Category :
Languages : en
Pages :
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