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Design And Fatigue Behavior Of Near Surface Mounted Cfrp Bars For Shear Strengthening Of Rc Bridge Girders
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Book Synopsis Design and Fatigue Behavior of Near-surface Mounted CFRP Bars for Shear Strengthening of RC Bridge Girders by : Brandon Ang Johnson
Download or read book Design and Fatigue Behavior of Near-surface Mounted CFRP Bars for Shear Strengthening of RC Bridge Girders written by Brandon Ang Johnson and published by . This book was released on 2011 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: Carbon fiber reinforced polymer (CFRP) materials are emerging as an effective means of strengthening and rehabilitating bridges. Near surface mounting (NSM) is a newer technique for application of CFRP for retrofitting of bridge members that provides advantages over conventional strengthening techniques. The technique is still new and uncertainties remain regarding design including the influence of member proportions, flexural reinforcing steel, and CFRP spacing. Further, retrofitted girders may also be exposed to millions of cycles of loading after rehabilitation. It is not known if the effects of fatigue loading will affect the service life of the retrofitted member. To address these issues, laboratory tests were performed on eight full-size reinforced concrete girders, representative of in-situ bridge girders, to determine the performance of NSM-CFRP retrofitting for shear. Two of the specimens were exposed to fatigue loading. Results indicated that NSM-CFRP retrofitting provides significant shear capacity increases and exposure to fatigue cycling did not affect the strength or behavior of the specimens.
Book Synopsis Strength and Durability of Near-surface Mounted CFRP Bars for Shear Strengthening Reinforced Concrete Bridge Girders by : Jacob Hans Goebel
Download or read book Strength and Durability of Near-surface Mounted CFRP Bars for Shear Strengthening Reinforced Concrete Bridge Girders written by Jacob Hans Goebel and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the interstate expansion of the 1950s, many conventionally reinforced concrete deck girder bridges were built throughout the country. These aging bridges commonly exhibit diagonal cracking and rate inadequately for shear, thus they are candidates for shear strengthening to extend their useful life. Carbon fiber reinforced polymers (CFRP) are emerging as effective materials for strengthening and rehabilitating such bridges. Near surface mounting (NSM) is a newer technique for application of CFRP for retrofitting bridge members that provides advantages over other strengthening techniques. The technique is still new and uncertainties remain regarding strength, long-term durability, and design including the influence of member proportions, flexural reinforcing steel, and CFRP spacing. Bridge girders retrofitted with NSM-CFRP may be exposed to millions of load cycles and environmental conditions and the influence of these exposures on performance are not established. To address these issues, laboratory tests were performed on ten full-size reinforced concrete girders, representative of in-situ bridge members, to determine the performance of NSM-CFRP retrofitting for shear strengthening. One of the specimens was exposed to fatigue loading, two were subjected to environmental exposures, and one was subjected to combined environmental exposure and fatigue loading. Results indicated that NSM-CFRP retrofitting provided significant shear capacity increases, and the high-cycle fatigue and environmental exposures considered did not adversely affect the strength or behavior of the girders. Environmental exposures of some of the adhesives considered did show somewhat reduced performance; therefore, careful selection of materials is important to ensure performance over the expected lifetime. Recommendations for shear strength design with NSM-CFRP are made.
Book Synopsis Strength and Durability of Near-surface Mounted CFRP Bars for Shear Strengthening Reinforced Concrete Bridge Girders by : Jacob Hans Goebel
Download or read book Strength and Durability of Near-surface Mounted CFRP Bars for Shear Strengthening Reinforced Concrete Bridge Girders written by Jacob Hans Goebel and published by . This book was released on 2012 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the interstate expansion of the 1950s, many conventionally reinforced concrete deck girder bridges were built throughout the country. These aging bridges commonly exhibit diagonal cracking and rate inadequately for shear, thus they are candidates for shear strengthening to extend their useful life. Carbon fiber reinforced polymers (CFRP) are emerging as effective materials for strengthening and rehabilitating such bridges. Near surface mounting (NSM) is a newer technique for application of CFRP for retrofitting bridge members that provides advantages over other strengthening techniques. The technique is still new and uncertainties remain regarding strength, long-term durability, and design including the influence of member proportions, flexural reinforcing steel, and CFRP spacing. Bridge girders retrofitted with NSM-CFRP may be exposed to millions of load cycles and environmental conditions and the influence of these exposures on performance are not established. To address these issues, laboratory tests were performed on ten full-size reinforced concrete girders, representative of in-situ bridge members, to determine the performance of NSM-CFRP retrofitting for shear strengthening. One of the specimens was exposed to fatigue loading, two were subjected to environmental exposures, and one was subjected to combined environmental exposure and fatigue loading. Results indicated that NSM-CFRP retrofitting provided significant shear capacity increases, and the high-cycle fatigue and environmental exposures considered did not adversely affect the strength or behavior of the girders. Environmental exposures of some of the adhesives considered did show somewhat reduced performance; therefore, careful selection of materials is important to ensure performance over the expected lifetime. Recommendations for shear strength design with NSM-CFRP are made.
Book Synopsis Design and Environmental Performance of Near-surface Mounted Carbon Fiber Reinforced Polymer Strips for Shear Strengthening Reinforced Concrete Bridge Girders by : Jacob Hans Goebel
Download or read book Design and Environmental Performance of Near-surface Mounted Carbon Fiber Reinforced Polymer Strips for Shear Strengthening Reinforced Concrete Bridge Girders written by Jacob Hans Goebel and published by . This book was released on 2011 with total page 209 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the interstate expansion of the 1950s, many conventionally reinforced concrete deck girder bridges were built throughout the country. These now vintage bridges commonly exhibit diagonal cracking and rate inadequately for shear, thus they are candidates for shear strengthening to extend their useful life. Near-surface mounted (NSM) retrofitting is a promising new strengthening technique, but limited test data are available for carbon fiber reinforced polymer (CFRP) in shear strengthening making the long-term durability of NSM-CFRP unknown. This paper provides experimental results from realistic full-scale specimens strengthened with NSM-CFRP. Specimens were tested for shear strength and subjected to environmental exposures to assess long-term durability. Small cylinder specimens were tested to investigate relative performance of different adhesives on bond strength under different environmental exposures. Test results provide a better understanding of the NSM-CFRP shear behavior and strength. Recommendations for shear strength design with NSM-CFRP are made.
Book Synopsis Strengthening Design of Reinforced Concrete with FRP by : Hayder A. Rasheed
Download or read book Strengthening Design of Reinforced Concrete with FRP written by Hayder A. Rasheed and published by CRC Press. This book was released on 2014-12-16 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt: Strengthening Design of Reinforced Concrete with FRP establishes the art and science of strengthening design of reinforced concrete with fiber-reinforced polymer (FRP) beyond the abstract nature of the design guidelines from Canada (ISIS Canada 2001), Europe (FIB Task Group 9.3 2001), and the United States (ACI 440.2R-08). Evolved from thorough cla
Book Synopsis Design of FRP Systems for Strengthening Concrete Girders in Shear by : Abdeldjelil Belarbi
Download or read book Design of FRP Systems for Strengthening Concrete Girders in Shear written by Abdeldjelil Belarbi and published by Transportation Research Board. This book was released on 2011 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Concrete Solutions 2014 by : Michael Grantham
Download or read book Concrete Solutions 2014 written by Michael Grantham and published by CRC Press. This book was released on 2014-08-18 with total page 838 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Concrete Solutions series of International Conferences on Concrete Repair began in 2003 with a conference held in St. Malo, France in association with INSA Rennes. Subsequent conferences have seen us partnering with the University of Padua in 2009 and with TU Dresden in 2011. This conference is being held for the first time in the UK, in association with Queen’s University Belfast and brings together delegates from 36 countries to discuss the latest advances and technologies in concrete repair. Earlier conferences were dominated by electrochemical repair, but there has been an interesting shift to more unusual methods, such as bacterial repair of concrete plus an increased focus on service life design aspects and modelling, with debate and discussion on the best techniques and the validity of existing methods. Repair of heritage structures is also growing in importance and a number of the papers have focused on the importance of getting this right, so that we may preserve our rich cultural heritage of historic structures. This book is an essential reference work for those working in the concrete repair field, from Engineers to Architects and from Students to Clients.
Book Synopsis Transactions of the American Society of Civil Engineers by : American Society of Civil Engineers
Download or read book Transactions of the American Society of Civil Engineers written by American Society of Civil Engineers and published by . This book was released on 2006 with total page 1264 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.
Book Synopsis 10th International Conference on FRP Composites in Civil Engineering by : Alper Ilki
Download or read book 10th International Conference on FRP Composites in Civil Engineering written by Alper Ilki and published by Springer Nature. This book was released on 2021-11-26 with total page 2516 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume highlights the latest advances, innovations, and applications in the field of FRP composites and structures, as presented by leading international researchers and engineers at the 10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), held in Istanbul, Turkey on December 8-10, 2021. It covers a diverse range of topics such as All FRP structures; Bond and interfacial stresses; Concrete-filled FRP tubular members; Concrete structures reinforced or pre-stressed with FRP; Confinement; Design issues/guidelines; Durability and long-term performance; Fire, impact and blast loading; FRP as internal reinforcement; Hybrid structures of FRP and other materials; Materials and products; Seismic retrofit of structures; Strengthening of concrete, steel, masonry and timber structures; and Testing. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.
Book Synopsis Flexural Anchorage Performance and Strengthening on Negative Moment Regions Using Near-surface Mounted Retrofitting in Reinforced Concrete Bridge Girders by : Laura M. Barker
Download or read book Flexural Anchorage Performance and Strengthening on Negative Moment Regions Using Near-surface Mounted Retrofitting in Reinforced Concrete Bridge Girders written by Laura M. Barker and published by . This book was released on 2014 with total page 239 pages. Available in PDF, EPUB and Kindle. Book excerpt: Large numbers of reinforced concrete deck girder (RCDG) bridges were built during the highway infrastructure boom of the 1950's. The advent of standardized deformed steel reinforcing bars during this time allowed for straight bar terminations in flexural tension regions. Designers of the time terminated reinforcing bars where they were no longer required by calculation and did not account for additional demands from the combination of shear and flexure. The design provisions of the time allowed higher shear stresses in the concrete than allowed in standards today which reduced the required quantity of transverse reinforcing steel. In addition, heavier trucks and higher traffic volumes on roadways today have greatly increased the service loading on these bridges. Engineers evaluating these older RCDG bridges often determine unsatisfactory load ratings due to flexural anchorage deficiencies in the girders, especially when the influence of shear is considered. These deficiencies result from inadequate capacity compared to current design standards due to poor cutoff details used in the initial design. Strengthening methods are necessary because comprehensive replacements of the large number of bridges are not economically feasible. Experimental research was conducted to evaluate the behavior of poorly detailed flexural anchorages and to develop methods to strengthen them. Realistic vintage girder specimens were constructed, retrofitted, instrumented, and tested to failure. The specimens reported in this thesis were full-scale inverted-T (IT) beams. Some of the specimens contained straight bar terminations crossing a preformed diagonal crack in the flexural tension region to investigate the influence of shear on the retrofit schemes. Instrumentation focused on measurement of the reinforcing steel stresses surrounding the diagonal crack and along the development length of the cutoff bars. Using results of past research to quantify the behavior of girders with straight-bar flexural anchorages in flexural tension regions, an innovative strengthening technique was developed using either near-surface mounted (NSM) stainless steel or titanium. Results from the NSM strengthening technique demonstrated the ability to delay or prevent flexural anchorage failures, with increased deformation capacities and increased strengths from 17% to 39% over baseline specimens. To show the success of this research and the immediate need for strengthened flexural anchorages, this research has already been implemented on a bridge in Mosier, Oregon. This groundbreaking research is described in detail in Appendix F.
Book Synopsis Shear Behavior of Reinforced Concrete Bridge Pile Cap Girders Strengthened with Carbon Fiber Reinforced Polymer (CFRP) Strips and CFRP Anchors by : William Asad Shekarchi
Download or read book Shear Behavior of Reinforced Concrete Bridge Pile Cap Girders Strengthened with Carbon Fiber Reinforced Polymer (CFRP) Strips and CFRP Anchors written by William Asad Shekarchi and published by . This book was released on 2016 with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt: Externally bonded CFRP strips are ideal for rehabilitating existing members due to their high tensile strength-to-weight ratio, relatively low cost, formability, and expedited installation times. However, without proper anchorage, CFRP strips debond from the concrete surface before the strength of the CFRP can be mobilized. Consequently, CFRP spike anchors are used to delay debonding and develop the fracture strength of the CFRP strips. Previous research conducted on large-scale T-beams have shown that uni-directional (vertical) and bi-directional (vertical and horizontal) applications of CFRP strips and anchors increased the cracking load and ultimate shear capacity of members with transverse steel reinforcement, thin webs, and span-to-depth ratios above three (i.e., sectional behavior). However, the ability of the CFRP to strengthen wide-webbed members remained unknown. The objective of this research was to investigate the feasibility of strengthening wide-webbed reinforced concrete pile cap girders in shear using CFRP strips and CFRP anchors and to develop comprehensive design and detailing recommendations for CFRP shear strengthening. An experimental test program, consisting of nine tests, was created to investigate: 1) the effects of loading conditions, 2) retrofitting uncracked and cracked sections, 3) placing anchors in tension zones, and 4) uni- and bi-directional CFRP layouts on the shear performance of 32-in. deep by 32-in. wide reinforced concrete pile cap girders. The test results indicated that the uni-directional CFRP layouts were able to increase the shear capacity by as much as 56% while the bi-directional layouts increased the cracking shear load by as much as 22%. Anchored CFRP layouts were found to be as efficient as fully wrapped layouts despite anchors being placed in tension zones. Moreover, at the onset of the loss of shear strength, the measured lower bound average CFRP fracture strain was 0.007, which is significantly larger than the permitted effective strain in current ACI 440.2R-08 design guidelines (i.e., 0.004).
Book Synopsis Seismic Performance of Corroded Reinforced Concrete Structures Retrofitted with FRP by : Dejian Shen
Download or read book Seismic Performance of Corroded Reinforced Concrete Structures Retrofitted with FRP written by Dejian Shen and published by Springer Nature. This book was released on with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :FIB – International Federation for Structural Concrete Publisher :FIB - Féd. Int. du Béton ISBN 13 :4990914805 Total Pages :920 pages Book Rating :4.9/5 (99 download)
Book Synopsis 11th PhD Symposium in Tokyo Japan by : FIB – International Federation for Structural Concrete
Download or read book 11th PhD Symposium in Tokyo Japan written by FIB – International Federation for Structural Concrete and published by FIB - Féd. Int. du Béton. This book was released on 2016-08-01 with total page 920 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book FRP written by J. G. Teng and published by John Wiley & Sons. This book was released on 2002 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibre-reinforced polymer (FRP) composites are used to strengthen reinforced concrete (RC) structures. A large amount of research now exists on this. This book brings together all existing research into one volume.
Book Synopsis Strengthening of Reinforced Concrete Structures by : L C Hollaway
Download or read book Strengthening of Reinforced Concrete Structures written by L C Hollaway and published by Elsevier. This book was released on 1999-03-05 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis Fiber-reinforced-plastic (FRP) Reinforcement for Concrete Structures by : Antonio Nanni
Download or read book Fiber-reinforced-plastic (FRP) Reinforcement for Concrete Structures written by Antonio Nanni and published by Elsevier Publishing Company. This book was released on 1993 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fiber reinforced plastic (FRP) composites for prestressed and non-prestressed concrete reinforcement has developed into a technology with serious and substantial claims for the advancement of construction materials and methods. Research and development is now occurring worldwide. The 20 papers in this volume make a further contribution in advancing knowledge and acceptance of FRP composites for concrete reinforcement. The articles are divided into three parts. Part I introduces FRP reinforcement for concrete structures and describes general material properties and manufacturing meth.
Book Synopsis Strengthening and Rehabilitation of Civil Infrastructures Using Fibre-Reinforced Polymer (FRP) Composites by : L C Hollaway
Download or read book Strengthening and Rehabilitation of Civil Infrastructures Using Fibre-Reinforced Polymer (FRP) Composites written by L C Hollaway and published by Elsevier. This book was released on 2008-07-18 with total page 415 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
