Carbon Fibre Reinforced Polymer Shear Strengthening Of Prestressed Concrete I Girders
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Carbon Fibre Reinforced Polymer Shear Strengthening Of Prestressed Concrete I Girders
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Author : Rico Massa
language : en
Publisher:
Release Date : 2019
Carbon Fibre Reinforced Polymer Shear Strengthening Of Prestressed Concrete I Girders written by Rico Massa and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
" 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." --
Shear Strengthening Of Reinforced And Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer Cfrp Sheets And Anchors
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Author : Yungon Kim
language : en
Publisher:
Release Date : 2012
Shear Strengthening Of Reinforced And Prestressed Concrete Beams Using Carbon Fiber Reinforced Polymer Cfrp Sheets And Anchors written by Yungon Kim and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Carbon fiber-reinforced plastics categories.
The ability to quickly apply carbon fiber reinforced polymer (CFRP) materials with a minimum of disruption to the use of a structure and with virtually no change in the geometry or weight of the element makes CFRP a viable and attractive material for strengthening existing elements. However, without adequate anchorage of CFRP sheets to the concrete surface, premature failures by debonding of the CFRP from the concrete significantly limit the capacity of CFRP strengthening systems. The objective of the study was to demonstrate the feasibility of using anchored CFRP for shear strengthening of large bridge girders or supporting elements. An extensive experimental program was undertaken on several full-scale T-beams and I girders to achieve project objectives. CFRP anchors used in the study performed well and were able to develop the full capacity of CFRP sheets thereby precluding debonding failures. Studied anchored CFRP systems were thus able to generate significant shear strength gains of up to 50 percent of the unstrengthened beam capacity. Experimental results, installation procedures for CFRP sheets and anchors, specifications for fabrication and installation of CFRP anchors, and anchored CFRP shear design guidelines are presented.
Shear Strengthening Of Prestressed Concrete I Beams Using Carbon Fiber Reinforced Polymers
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Author : Moustapha Ibrahim Ary
language : en
Publisher:
Release Date : 2011
Shear Strengthening Of Prestressed Concrete I Beams Using Carbon Fiber Reinforced Polymers written by Moustapha Ibrahim Ary and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Prestressed concrete beams categories.
Design Of Frp Systems For Strengthening Concrete Girders In Shear
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Author : Abdeldjelil Belarbi
language : en
Publisher: Transportation Research Board
Release Date : 2011
Design Of Frp Systems For Strengthening Concrete Girders In Shear written by Abdeldjelil Belarbi and has been published by Transportation Research Board this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with Architecture categories.
TRB's National Cooperative Highway Research Program (NCHRP) Report 678: Design of FRP Systems for Strengthening Concrete Girders in Shear offers suggested design guidelines for concrete girders strengthened in shear using externally bonded Fiber-Reinforced Polymer (FRP) systems. The guidelines address the strengthening schemes and application of the FRP systems and their contribution to shear capacity of reinforced and prestressed concrete girders. The guidelines are supplemented by design examples to illustrate their use for concrete beams strengthened with different FRP systems. Appendix A of NCHRP Report 678, which contains the research agency's final report, provides further elaboration on the work performed in this project. Appendix A: Research Description and Findings, is only available online.
Shear Behavior Of Large Scale Concrete Beams Strengthened With Fibre Reinforced Polymer Frp Sheets
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Author : David Alan Schnerch
language : en
Publisher:
Release Date : 2001
Shear Behavior Of Large Scale Concrete Beams Strengthened With Fibre Reinforced Polymer Frp Sheets written by David Alan Schnerch and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Many studies conducted on the use of Fibre Reinforced Polymer (FRP) sheets for shear strengthening have been completed on beams that are small in relation to the effective bond length of the FRP. This study focuses on the use of FRP sheets for large-scale concrete members. Two series of large scale concrete beams were strengthened in shear to develop a better understanding of the behaviour of FRP shear strengthening on large specimens and to develop a means of predicting the shear capacity for all sizes of members. The first series of three specimens were obtained from a full sized I-section prestressed concrete bridge girder. One of these specimens was tested as a control, with the remaining two strengthened for shear with different configurations of Carbon Fibre Reinforced Polymer (CFRP) sheets. To develop a better understanding of bond behaviour of large-scale specimens, three reinforced concrete T-section beams were fabricated with a web height that was larger than those found in the literature. One of these beams was strengthened in shear using Glass Fibre Reinforced Polymer (GFRP) sheets and two others were strengthened using CFRP sheets. These beams were tested under static loading conditions. (Abstract shortened by UMI.).
Shear Behavior Of Large Scale Concrete Beams Strengthened With Fibre Reinforced Polymer Frp Sheets
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Author :
language : en
Publisher:
Release Date : 2001
Shear Behavior Of Large Scale Concrete Beams Strengthened With Fibre Reinforced Polymer Frp Sheets written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
Many studies conducted on the use of Fibre Reinforced Polymer (FRP) sheets for shear strengthening have been completed on beams that are small in relation to the effective bond length of the FRP. This study focuses on the use of FRP sheets for large-scale concrete members. Two series of large scale concrete beams were strengthened in shear to develop a better understanding of the behaviour of FRP shear strengthening on large specimens and to develop a means of predicting the shear capacity for all sizes of members. The first series of three specimens were obtained from a full sized I-section prestressed concrete bridge girder. One of these specimens was tested as a control, with the remaining two strengthened for shear with different configurations of Carbon Fibre Reinforced Polymer (CFRP) sheets. To develop a better understanding of bond behaviour of large-scale specimens, three reinforced concrete T-section beams were fabricated with a web height that was larger than those found in the literature. One of these beams was strengthened in shear using Glass Fibre Reinforced Polymer (GFRP) sheets and two others were strengthened using CFRP sheets. These beams were tested under static loading conditions. (Abstract shortened by UMI.).
Advanced Fibre Reinforced Polymer Frp Composites For Structural Applications
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Author : L.C. Hollaway
language : en
Publisher: Elsevier Inc. Chapters
Release Date : 2013-09-30
Advanced Fibre Reinforced Polymer Frp Composites For Structural Applications written by L.C. Hollaway and has been published by Elsevier Inc. Chapters this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-09-30 with Technology & Engineering categories.
Chapters 16 and discuss the development of the advanced polymer composite material applications in bridge engineering. They demonstrate the innovative types of components and structures which have been developed from FRP composite materials and the most advantageous way to employ composites in bridge engineering. Given the importance of bridge infrastructure, the discussion of this topic has been split over two chapters. This chapter focuses on the type of FRP composite materials used in bridge engineering, their in-service properties and their applications in bridge enclosures and the rehabilitation of reinforced and prestressed concrete bridge beams and columns. covers rehabilitation of metallic bridge structures, all FRP composite bridges and bridges built with hybrid systems.
Fibre Reinforced Polymer Reinforcement For Concrete Structures
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Author : Kiang-Hwee Tan
language : en
Publisher: World Scientific
Release Date : 2003
Fibre Reinforced Polymer Reinforcement For Concrete Structures written by Kiang-Hwee Tan and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Technology & Engineering categories.
Fibre-reinforced polymer (FRP) reinforcement has been used in construction as either internal or external reinforcement for concrete structures in the past decade. This book provides the latest research findings related to the development, design and application of FRP reinforcement in new construction and rehabilitation works. The topics include FRP properties and bond behaviour, externally bonded reinforcement for flexure, shear and confinement, FRP structural shapes, durability, member behaviour under sustained loads, fatigue loads and blast loads, prestressed FRP tendons, structural strengthening applications, case studies, and codes and standards. Contents: .: Volume 1: Keynote Papers; FRP Materials and Properties; Bond Behaviour; Externally Bonded Reinforcement for Flexure; Externally Bonded Reinforcement for Shear; Externally Bonded Reinforcement for Confinement; FRP Structural Shapes; Volume 2: Durability and Maintenance; Sustained and Fatigue Loads; Prestressed FRP Reinforcement and Tendons; Structural Strengthening; Applications in Masonry and Steel Structures; Field Applications and Case Studies; Codes and Standards. Readership: Upper level graduates, graduate students, academics and researchers in materials science and engineering; practising engineers and project managers
Shear Strengthening Of Reinforced Concrete Beams With Bi Directional Carbon Fiber Reinforced Polymer Cfrp Strips And Cfrp Anchors
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Author : Nawaf Khaled Alotaibi
language : en
Publisher:
Release Date : 2014
Shear Strengthening Of Reinforced Concrete Beams With Bi Directional Carbon Fiber Reinforced Polymer Cfrp Strips And Cfrp Anchors written by Nawaf Khaled Alotaibi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The use of externally bounded Carbon Fiber Reinforced Polymer (CFRP) for strengthening existing RC structures has shown promising results. Although CFRP materials have high tensile strength, the ability to utilize that strength is limited by debonding of the CFRP laminates from the concrete surface. In order to prevent or delay debonding, CFRP anchors were used to provide an alternative means of transferring forces from CFRP strips to the concrete. Previous tests on prestressed I-girders strengthened with uni-directional and bi-directional CFRP strips showed that bi-directional CFRP application resulted in significant shear strength gain in comparison to a uni-directional application. The objective of this thesis is to evaluate the behavior of reinforced concrete beams strengthened in shear with bi-directional CFRP strips and CFRP anchors so that the findings from the previous work can be understood and implemented. Four 24 in. deep T-beams were fabricated at the Phil M. Ferguson Structural Engineering Laboratory at The University of Texas at Austin. Eight tests were conducted on these specimens to examine the effect of the bi-directional layout of CFRP on the shear strength. Specimens with 14-in. web width were selected as a part of the experimental program to allow for direct comparison with test results from the previous project. Additional beams with a web width of 8 in. were included to evaluate thinner webs similar to those in the I-girders. Test results indicate a significant increase in shear strength due to the bi-directional application of CFRP strips with CFRP anchors installed on beams with a shear span-to-depth ratio (a/d) of 3. Substantial shear strength gain up to 62% was achieved in beams with 14-in. webs. and up to 43% for beams with 8-in. webs. However, negligible shear strength gain was observed in beams with a/d of 1.5 (deep beams). Experimental test results demonstrate an interaction between the contribution of concrete, transverse steel and CFRP to the shear resistance of a reinforced concrete beam. The findings of this research contribute to a better understanding of the shear behavior of reinforced concrete members strengthened with externally bonded CFRP applied bi-directionally. Experimental results from this research project provide data needed in the field of CFRP shear strengthening since limited data are available on large-scale tests.
Strengthening Of Reinforced Concrete Structures
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Author : L C Hollaway
language : en
Publisher: Elsevier
Release Date : 1999-03-05
Strengthening Of Reinforced Concrete Structures written by L C Hollaway and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-03-05 with Technology & Engineering categories.
The in situ rehabilitation or upgrading of reinforced concrete members using bonded steel plates is an effective, convenient and economic method of improving structural performance. However, disadvantages inherent in the use of steel have stimulated research into the possibility of using fibre reinforced polymer (FRP) materials in its place, providing a non-corrosive, more versatile strengthening system. This book presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforces polymer composite plates. It is based to a large extent on material developed or provided by the consortium which studied the technology of plate bonding to upgrade structural units using carbon fibre / polymer composite materials. The research and trial tests were undertaken as part of the ROBUST project, one of several ventures in the UK Government's DTI-LINK Structural Composites Programme. The book has been designed for practising structural and civil engineers seeking to understand the principles and design technology of plate bonding, and for final year undergraduate and postgraduate engineers studying the principles of highway and bridge engineering and structural engineering. Detailed study of the flexural strengthening of reinforced and prestressed concrete members using fibre reinforced polymer composites Contains in-depth case histories