Download or read book Evaluation of the Use of Anchorage Systems for Strengthening Concrete Members Reinforced by Fiber reinforced polymer FRP Laminate written by Mai Abd Alrhman alrhman Aljaberi and published by . This book was released on 2021 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: An anchorage system is the most effective method for preventing or delaying the debonding of fiber-reinforced polymer laminates; however, despite extensive studies, the related design information is still unclear and limits its use. The goal of this research, therefore, is to investigate the parameters that affect the debonding strain of CFRP beams secured with different types of anchors.For this purpose, 34 small-scale beams were tested under four-point loading. Two (2) of them were control beams (no FRP, no anchors), 8 were strengthened with FRP at their tension sides, and the remaining 24 were secured with different types of anchor systems (U-wrap, mechanical, or fan). The parameters examined included the compressive strength of the concrete and the number of longitudinal FRPs. It was concluded that these parameters have a considerable effect on the strength of the beams, as well as on the maximum strain of the FRP. The experimental results were compared to the ACI equation and the previous studies to investigate the efficiency of different types of anchors.

Download or read book Categorization and Experimental Evaluation of Anchorage Systems for Fiber reinforced Polymer Laminates Bonded to Reinforced Concrete Structures written by Stephen Vincent Grelle and published by . This book was released on 2011 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: "While externally-bonded fiber-reinforced polymer (FRP) composites are commonly used for the strengthening of structurally deficient reinforced concrete (RC) members, the topic of anchoring FRP to concrete to achieve higher design strengths has not been addressed. Many innovative systems have been developed to anchor FRP to concrete, but the research involving these anchorage systems is not centralized and is therefore difficult to access. Additionally, systematic testing procedures for evaluating the strength of an anchorage system have not been widely used. To aid in the organization of anchorage system research and facilitate a better understanding of anchorage system behavior, a categorization system was developed based on the understood behavior of the FRP anchorage systems, as well as their potential applications. This new categorization system was used to discuss the applicability of anchorage testing procedures to various types of anchorage. Experimental research involving anchorage systems used for the emergency repair of severely damaged bridge columns was also performed. The anchorage systems included a novel anchorage system that was the focus of the experimental portion of this research. Results from the experimental program show that while the novel anchorage has promise for use in FRP strengthening applications, the assumed behavior of the novel anchorage was inconsistent with the observed behavior. Because detailed design procedures could not be developed using the experimental data, future testing of this anchorage system should be performed in the absence of the large number of variables that affected the anchorage's performance during the column tests"--Abstract, leaf iii.

Download or read book Proceedings of the 5th International Conference on Rehabilitation and Maintenance in Civil Engineering written by Stefanus Adi Kristiawan and published by Springer Nature. This book was released on 2022-09-01 with total page 1142 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers presented at the 5th International Conference on Rehabilitation and Maintenance in Civil Engineering (ICRMCE 2021), held in Surakarta, Indonesia. The papers are grouped into sequential themes representing the structure of this book: o Part 1: Factors affecting building and infrastructure performance o Part 2: Testing and inspection of existing building and infrastructure o Part 3: Protection, maintenance, repair, and retrofitting of building and infrastructure o Part 4: Maintenance management of building and infrastructure o Part 5: Service life modelling of building and infrastructure o Part 6: Hazard mitigation o Part 7: Sustainability aspect in civil engineering design, process, modelling, maintenance, and rehabilitation Postgraduate students, researchers, and practitioners specializing and working in the area of protection, maintenance, repair, and retrofitting of civil engineering infrastructures will find this book very useful.

Download or read book Experimental Evaluation of Full Scale I section Reinforced Concrete Beams with Cfrp shear Reinforcement written by Christian Aquino and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced polymer (FRP) systems have shown great promise in strengthening reinforced concrete structures. These systems are a viable option for use as external reinforcement because of their light weight, resistance to corrosion, and high strength. These systems, externally bonded in the form of sheets or laminates, have shown to increase the flexural and more recently the shear capacity of members. Major concerns of the system are issues related to the bond strength and premature peeling especially when reentrant corners are present. The objectives of this study were to verify the effectiveness of carbon FRP (CFRP) laminates on an I-section beam with no anchorage and to determine the feasibility of using an anchorage system to prevent premature debonding. The two types of anchorage systems used were a horizontal CFRP laminate and glass FRP (GFRP) spikes. These anchorage systems verified that the use of anchorage on I-shaped beams can prevent premature debonding of the laminate and allow the specimens to achieve a higher shear capacity. Recommendations for future research of such systems are also presented.

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.

Download or read book Rehabilitation of Concrete Structures with Fiber Reinforced Polymer written by Riadh Al-Mahaidi and published by Butterworth-Heinemann. This book was released on 2018-11-12 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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)

Download or read book Composites for Construction written by Lawrence C. Bank and published by John Wiley & Sons. This book was released on 2006-07-21 with total page 572 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first textbook on the design of FRP for structural engineering applications Composites for Construction is a one-of-a-kind guide to understanding fiber-reinforced polymers (FRP) and designing and retrofitting structures with FRP. Written and organized like traditional textbooks on steel, concrete, and wood design, it demystifies FRP composites and demonstrates how both new and retrofit construction projects can especially benefit from these materials, such as offshore and waterfront structures, bridges, parking garages, cooling towers, and industrial buildings. The code-based design guidelines featured in this book allow for demonstrated applications to immediately be implemented in the real world. Covered codes and design guidelines include ACI 440, ASCE Structural Plastics Design Manual, EUROCOMP Design Code, AASHTO Specifications, and manufacturer-published design guides. Procedures are provided to the structural designer on how to use this combination of code-like documents to design with FRP profiles. In four convenient sections, Composites for Construction covers: * An introduction to FRP applications, products and properties, and to the methods of obtaining the characteristic properties of FRP materials for use in structural design * The design of concrete structural members reinforced with FRP reinforcing bars * Design of FRP strengthening systems such as strips, sheets, and fabrics for upgrading the strength and ductility of reinforced concrete structural members * The design of trusses and frames made entirely of FRP structural profiles produced by the pultrusion process

Download or read book Anchorage and Bond Characteristics of Externally Bonded FRP Laminates Used for Shear Strenghtening sic of RC and PC Girders written by Carlos Andres Ortega Ordonez and published by . This book was released on 2009 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In the last three decades, the use of fiber reinforced polymer (FRP) materials to strengthen structures externally has emerged as one of the most promising technologies in materials and structural engineering, and these materials have been gaining popularity in the civil engineering community. Externally bonded FRP sheets and laminates have been used successfully to increase flexural and shear capacity. The overall performance of the strengthened system depends heavily on the quality of the bond between the concrete and the FRP laminate. Low bond strength can cause delamination at the fiber-matrix interface and at the FRP laminate-concrete interface. As a result, a premature failure of a repaired structure occurs. Therefore, anchorage systems are necessary to enhance the shear contribution of FRP by preventing premature failure due to debonding. This study analyzed the existing experimental and analytical studies of various mechanical anchorage systems and the bond behavior of FRP composite materials externally bonded to concrete to identify the parameters affecting the design of mechanical anchorage systems. Based on this analysis, several configurations of mechanical anchorage systems were tested on full-scale prestressed concrete (PC) girders and reinforced concrete (RC) T-beams. Eight full-scale PC girders and six RC T-beams were constructed with various stirrup spacings, strengthened with various FRP schemes, and tested in the Highbay Structures Laboratory at Missouri University of Science and Technology (S&T). During the test, the bond behavior was recorded and applied to existing analytical models for validation. Based on the test results, the present study offers a new approach to calculate effective bond length. The anchorage systems considered here consist of thick plate and steel anchor bolts, which many studies found to be the most practical. Based on this work, the present study proposes design guidelines for mechanical anchorage systems"--Abstract, leaf iii.

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

Download or read book ACI 440 2R 17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures written by ACI Committee 440 and published by . This book was released on 2017-04-27 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Fiber Reinforced Polymer Strengthening of Steel Beams written by Bibek Regmi Bagale and published by . This book was released on 2019 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced polymer (FRP) strengthening has been widely used for concrete structures. However, limited studies have been conducted on FRP application to steel structures. The use of FRP materials to retrofit steel members is an effective replacement for welded or bolted steel plates and offer high strength-to-weight ratio, resilience to environmental degradation, and a robust fatigue performance. Although the application of FRP to retrofit steel structures have been on the rise in recent years, their behavior under various loading conditions have not been fully explored. The objective of this study is to analyze FRP retrofitting of steel beams using finite element analysis (FEA) modeling technique. FEA model of a steel beam strengthened with fiber reinforced polymer (FRP) laminates was developed using ANSYS Mechanical APDL finite element software program. The FEA models of steel beams subjected to monotonic static and fatigue loads were validated by comparing the FEA and experimental results of existing studies in the literature and they were in good agreement. Parametric studies were then performed on the validated models to investigate the behavior of FRP strengthened steel beams subjected to static and dynamic loadings. Under static load, damaged and undamaged steel beams were retrofitted with carbon fiber reinforced polymer (CFRP) to examine the effect of bond length and transverse anchorages on flexural behavior and failure modes. The CFRP laminate provided an increase in the flexural capacity for the undamaged and damaged beams by approximately 1.7 and 3 times respectively as compared to their counterpart control beams. The FRP laminate effective bond length under static loading condition was found to be 2/5 of the simply supported span length of the steel beam. Furthermore, with the addition of anchorages, the flexural capacity was increased by 1.5 times and the mode of failure changed from the debonding to rupture. Basalt fiber reinforced polymer (BFRP) is a newer form of FRP material which is extracted from natural sources and is considered an environment friendly option in lieu of CFRP material. BFRP application to steel beams were investigated in this study for both static and dynamic cases. Under dynamic loading, different FRP material types such as CFRP, BFRP and Aramid fiber reinforced polymer (AFRP) were studied. A regression analysis was performed to generate new S-N curves and formulas were proposed to predict the fatigue life of BFRP and AFRP strengthened steel beams.

Download or read book Strengthening of Reinforced Concrete Structures written by Len C. Hollaway and published by CRC Press. This book was released on 1999-04-09 with total page 352 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 using fiber reinforced polymer (FRP) material in its place, with the goal of providing a non-corrosive, more versatile strengthening system. Strengthening of Reinforced Concrete Structures presents a detailed study of the flexural strengthening of reinforced and prestressed concrete members using FRP composite plates. This book covers short and long term performance through model and full-scale experimental testing plus theoretical and numerical considerations. It discusses previous investigative and site work undertaken to strengthen concrete beams using steel bonded pates and the pros and cons of using the steel and composite plate materials. It also presents case histories of construction members upgraded or strengthened using carbon fibre/polymer matrix composite materials bonded to the structural unit. A consortium of academic and industrial researchers provided much of the data and contributed the chapters to this volume. The research and trial tests were undertaken as part of the United Kingdom's ROBUST project. Strengthening of Reinforced Concrete Structures serves to disseminate the large amount of information that resulted from these studies. As detailed in this book, their results will serve to help generate and formulate design specifications as engineers continue to apply these important techniques to an ever-widening range of applications.

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

Download or read book Concrete Solutions 2011 written by Michael Grantham and published by CRC Press. This book was released on 2011-09-08 with total page 872 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, followed by the second conference in 2006 ( with INSA again, at St. Malo, France), and the third conference in 2009 (in Padova and Venice, in association with the University of Padova). Now in 2011, the event is being held in Dresden in Germany and has brought together some 112 papers from 33 countries. Whereas electrochemical repair tended to dominate the papers in earlier years, new developments in structural strengthening with composites have been an increasingly important topic, with a quarter of the papers now focusing on this area. New techniques involving Near Surface Mounted (NSM) carbon fibre rods, strain hardening composites, and new techniques involving the well established carbon fibre and polyimide wrapping and strengthening systems are presented. Seventeen papers concentrate on case studies which are all-important in such conferences, to learn about what works (and what doesn’t work) on real structures. Thirteen papers are devoted to new developments in Non-Destructive Testing (NDT). Other topics include service life modelling, fire damage, surface protection methods and coatings, patch repair, general repair techniques and whole life costing. This book is essential reading for anyone engaged in the concrete repair field, from engineers, to academics and students and also to clients, who, as the end user, are ultimately responsible for funding these projects and making those difficult decisions about which system or method to use.

Download or read book PCI Journal written by and published by . This book was released on 2008 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Development of Anchorage System for FRP Strengthening Applications Using Integrated FRP Composite Anchors written by Geoffrey N. McGuirk and published by . This book was released on 2011 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past three decades the use of externally bonded fiber reinforced polymer (FRP) materials for structural strengthening applications has become an accepted and widely used method. A primary concern of FRP structural strengthening systems is that the FRP often debonds from the concrete well before the load capacity of the FRP material is reached. In addition, debonding failures are often brittle and occur with little warning. Past research concluded that fastening FRP sheets with FRP anchors is an effective method for delaying or preventing debonding failures. However, there is a clear lack of research pertaining to fastening FRP sheets with FRP anchors, and a corresponding lack of design guidance. The primary objective of this research program was to better understand the behavior of bonded FRP sheets that are secured with FRP anchors to aid in future development of design recommendations of this anchorage system. This thesis deals with carbon fiber unidirectional sheets applied using the wet layup system. Design parameters that were investigated include: manufacturer of the FRP materials, unanchored and anchored sheets, number of anchor rows and spacing between rows, number of sheet plies (single or double), and length of bonded sheet behind the anchors. A total of sixteen specimens were tested. Experimental results show that FRP anchorage systems are very effective in increasing load capacity by delaying debonding. Finite element models were also developed of anchored and unanchored bonded FRP sheets.

Download or read book Evaluation and Strengthening of Elevated Slab on Grade with Fiber reinforced Polymer FRP Laminates written by Natawut Chaiwino and published by . This book was released on 2019 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt: Elevating a residential house appears to be one of the most effective techniques to eliminate or alleviate flood losses. In general, the elevation procedures involve raising a house as well as its typical slab-on-grade (SOG) foundation and supporting it with an additional support system. The unconcerned effects of the drastic changes in support condition could lead to severe structural damages and failure of houses. After elevated, thus, such slabs must be properly supported and retrofitted, for which the available methodology and know-how is almost nonexistent. The fiber reinforced polymer (FRP) application, considered as a promising technique in the rehabilitation of concrete structures, are utilized in this study to improve the structural performance of an elevated SOG. The main objectives of the research is to investigate and evaluate the flexural behavior of a full-scale elevated SOG with low reinforcement ratio and the effect of using externally bonded carbon FRP (CFRP) and glass FRP (GFRP) laminates to retrofit such slabs. The current study includes three distinct phases: experimental investigation of two full-scale slabs subjected to static load, finite element analyses of test slabs to verify with the experimental results, and parametric study to expand the results using validated numerical models. The results show a delay of the crack initiation and propagation, as well as an increase in the ultimate load capacity of 30% over the control with the use of a single layer of CFRP laminates. The experimental and theoretical were found to correlate well in terms of the load-deflection responses, crack development, and modes of failure.