Shear Strengthening Of Reinforced Concrete Beams With Carbon Fiber Reinforced Polymer Cfrp Under Fatigue And Sustained Loading Applications
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Shear Strengthening Of Reinforced Concrete Beams With Carbon Fiber Reinforced Polymer Cfrp Under Fatigue And Sustained Loading Applications
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Author : Christopher Neil Satrom
language : en
Publisher:
Release Date : 2011
Shear Strengthening Of Reinforced Concrete Beams With Carbon Fiber Reinforced Polymer Cfrp Under Fatigue And Sustained Loading Applications written by Christopher Neil Satrom and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Four specimens were tested to evaluate the shear performance of beams with carbon fiber reinforced polymer (CFRP) laminates and CFRP anchors under fatigue and sustained loading applications. The specimens consisted of 24-in. deep T-beams that were constructed and tested at Phil M. Ferguson Structural Engineering Laboratory at the University of Texas at Austin. The specimens were strengthened in shear with CFRP laminates anchored with CFRP anchors. One end of each specimen was strengthened using bonded CFRP laminates while the other end was strengthened using unbonded CFRP laminates. Two specimens were used for fatigue testing and two were used for sustained load testing. For each set of tests, one specimen was strengthened using CFRP laminates prior to cracking and one specimen was strengthened using CFRP laminates following the initial cracking of the specimen. The CFRP laminates showed no signs of deteriorations in strength during fatigue testing, with only small increases in strain occurring in the CFRP laminates during testing. After fatigue loading was completed, the specimens were monotonically loaded to failure. The failure loads were 5 to 15% lower than beams that were not subjected to fatigue loading. Sustained load tests were subjected to a constant midpoint load based on service load requirements for a period of 217 days. CFRP laminates performed well during sustained loading. CFRP strains increased slightly throughout testing, but no signs of deterioration were observed. For both types of tests, specimens strengthened using bonded CFRP laminates demonstrated an increased stiffness resulting in smaller crack widths and lower strains in the internal steel. These benefits were not as great in specimens strengthened after the initial cracking of the specimen.
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
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.
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
Reinforced Concrete Design With Frp Composites
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Author : Hota V.S. GangaRao
language : en
Publisher: CRC Press
Release Date : 2006-11-20
Reinforced Concrete Design With Frp Composites written by Hota V.S. GangaRao and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006-11-20 with Technology & Engineering categories.
Although the use of composites has increased in many industrial, commercial, medical, and defense applications, there is a lack of technical literature that examines composites in conjunction with concrete construction. Fulfilling the need for a comprehensive, explicit guide, Reinforced Concrete Design with FRP Composites presents specific informat
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.
Advanced Concretes And Their Structural Applications
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Author : Zhigang Zhang
language : en
Publisher: Frontiers Media SA
Release Date : 2022-09-23
Advanced Concretes And Their Structural Applications written by Zhigang Zhang and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-09-23 with Technology & Engineering categories.
Shear Strengthening Of Rc Deep Beams With Large Openings Using Carbon Fiber Reinforced Polymers Cfrp
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Author : Foo Sheng Tong
language : en
Publisher:
Release Date : 2015
Shear Strengthening Of Rc Deep Beams With Large Openings Using Carbon Fiber Reinforced Polymers Cfrp written by Foo Sheng Tong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with Dissertations, Academic categories.
This research deals with the experimental study of the behaviour of reinforced concrete deep beams with or without large rectangular openings as well as openings strengthened using externally bonded Carbon Fiber Reinforced Polymer (CFRP) composites in shear. The structural behaviour, including the load deflection, cracking patterns, failure mode, and effectiveness of the CFRP wraps were investigated. A total of four (4) specimens of beams with compressive strength of 35 MPa were tested to induce shear failure under 4 points loading test, which included one solid deep beam acted as a control beam (CB), one of which was tested without strengthening (US-BRO), and the remaining beams were strengthened with CFRP wraps in varying configurations around the opening (S-BRO-1, S-BRO-2). The beam had a cross section of 120 mm in width and 600 mm in depth as well as a length of 2400 mm. All the test specimens had a same geometry, main reinforcement arrangements and openings location. All the preparatory works of specimen materials were conducted in Laboratory FKASA. The examined parameter was the effect of configurations of the CFRP wraps used for the shear strengthening. The inclusion of un-strengthened large rectangular openings in the shear zone of a reinforced concrete deep beam leads to a reduction of ultimate beam strength by approximately 70%. The application of CFRP wraps with the presented strengthening configurations restricted the propagation of the diagonal crack and effectively increases ultimate load-carrying capacity as well as the ductility of the beam. The strength re-gains by U-shaped strengthening configuration around the openings was approximately 36% as compared to the beam with un-strengthened openings. However, the deep beam with U-shaped CFRP with horizontal fiber strengthened at the top and bottom chords of the openings were not capable to restore the control beam's original structural strength remarkably. The beam only managed to re-gain about 41% of the control beam's capacity.
Strengthening And Rehabilitation Of Civil Infrastructures Using Fibre Reinforced Polymer Frp Composites
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Author : L C Hollaway
language : en
Publisher: Elsevier
Release Date : 2008-07-18
Strengthening And Rehabilitation Of Civil Infrastructures Using Fibre Reinforced Polymer Frp Composites 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 2008-07-18 with Technology & Engineering categories.
The repair of deteriorated, damaged and substandard civil infrastructures has become one of the most important issues for the civil engineer worldwide. This important book discusses the use of externally-bonded fibre-reinforced polymer (FRP) composites to strengthen, rehabilitate and retrofit civil engineering structures, covering such aspects as material behaviour, structural design and quality assurance. The first three chapters of the book review structurally-deficient civil engineering infrastructure, including concrete, metallic, masonry and timber structures. FRP composites used in rehabilitation and surface preparation of the component materials are also reviewed. The next four chapters deal with the design of FRP systems for the flexural and shear strengthening of reinforced concrete (RC) beams and the strengthening of RC columns. The following two chapters examine the strengthening of metallic and masonry structures with FRP composites. The last four chapters of the book are devoted to practical considerations in the flexural strengthening of beams with unstressed and prestressed FRP plates, durability of externally bonded FRP composite systems, quality assurance and control, maintenance, repair, and case studies. With its distinguished editors and international team of contributors, Strengthening and rehabilitation of civil infrastructures using fibre-reinforced polymer (FRP) composites is a valuable reference guide for engineers, scientists and technical personnel in civil and structural engineering working on the rehabilitation and strengthening of the civil infrastructure. Reviews the use of fibre-reinforced polymer (FRP) composites in structurally damaged and sub-standard civil engineering structures Examines the role and benefits of fibre-reinforced polymer (FRP) composites in different types of structures such as masonry and metallic strengthening Covers practical considerations including material behaviour, structural design and quality assurance
Shear Strengthening Of Reinforced Concrete Beams With Carbon Fiber Reinforced Polymer Cfrp And Improved Anchor Details
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Author : Kevin Timothy Quinn
language : en
Publisher:
Release Date : 2009
Shear Strengthening Of Reinforced Concrete Beams With Carbon Fiber Reinforced Polymer Cfrp And Improved Anchor Details written by Kevin Timothy Quinn and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
Fifteen tests were conducted to evaluate the shear performance of beams with carbon fiber reinforced polymer (CFRP) laminates and CFRP anchors. The specimens consisted of 24-in. deep T-beams. The specimens were strengthened in shear with CFRP laminates that were anchored using several different CFRP end anchorage details. Load was applied to the reinforced concrete members at three different shear span-to-depth ratios. Observations of the behavior and data from the tests were used to evaluate the performance of the CFRP laminates and CFRP anchors. Overall, a 30-40% increase in shear strength was observed when anchored CFRP laminates were installed on members loaded at a shear span-to-depth ratio greater than two. The CFRP strengthening system performed well when properly detailed CFRP anchors were installed. Design recommendations regarding the installation of the CFRP anchors were developed. The CFRP anchorage detail developed in this study provided additional CFRP material in critical locations to reinforce the anchor and prevent premature failures from occurring due to anchor rupture. Theoretical calculations predicting the shear strength of the retrofitted concrete members were carried out and compared to the measured strengths of the members. Based on this analysis, a design equation was developed that produced conservative results for all of the specimens tested.