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Bond Characteristics And Performance Of Cfrp Rods In Prestressed Concrete Beams
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Book Synopsis Bond Characteristics and Performance of CFRP Rods in Prestressed Concrete Beams by : Matthew Vincent D'Angelo
Download or read book Bond Characteristics and Performance of CFRP Rods in Prestressed Concrete Beams written by Matthew Vincent D'Angelo and published by . This book was released on 2003 with total page 546 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fatigue Behavior and Modeling of Reinforced Concrete Structures Using NSM FRP Composites by : Cheng Chen
Download or read book Fatigue Behavior and Modeling of Reinforced Concrete Structures Using NSM FRP Composites written by Cheng Chen and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Near-surface mounted (NSM) method using Fiber Reinforced Polymer (FRP) composites proves to be promising in structural strengthening and rehabilitation of deficient reinforced concrete (RC) and prestressed concrete members. However, the fatigue behavior of strengthened members is still not well understood and needs extensive research before practical design guidelines are established. The objective of this research is to experimentally and analytically assess the fatigue performance and predict the fatigue life of NSM CFRP strengthened RC beams. In particular, it aims to: (1) experimentally evaluate the bond performance of the NSM CFRP reinforcement-epoxy interface and its degradation; (2) propose an analytical model to predict the bond performance; (3) evaluate the test results of the flexural performance of the NSM CFRP strengthened RC beams subject to fatigue loadings; and (4) develop models to predict the corresponding flexural performance and fatigue life of the strengthened concrete members. Thirty-six NSM strengthened concrete block specimens were fabricated and then subject to various fatigue loadings. Direct pull-out test was conducted on each specimen to obtain the bond characteristics and performance. Variables considered in this study include: cycles of fatigue loadings and types of NSM reinforcements. The result shows that specimens using NSM rods had higher bond strength at the epoxy-NSM interface than that at the concrete-epoxy interface, resulting in the governing failure due to breakage of epoxy and concrete. Specimens using NSM strips, on the other hand, failed mainly due to debonding (at the epoxy-NSM interface). Moreover, fatigue loading tended to shift the FRP strain and the local bond stress distribution from the loaded end towards the free end in NSM-strengthened specimens. The local bond stress-slip relationship under fatigue followed a hardening-softening behavior for both types of NSM reinforcement. Fatigue loading generally decreased the bond strength while the corresponding slip remained almost unchanged. A theoretical solution to this bond characteristics under fatigue loading is derived to predict the debonded length progression and fatigue behavior of the bond related variables (e.g. distribution of bond stress, slip, and tensile stress of the NSM reinforcement) for concrete blocks strengthened by NSM CFRP reinforcement. Twenty RC beams strengthened with NSM FRP were constructed in 2 batches, one strengthened by NSM rods and the other by NSM strips. Sixteen NSM strengthened specimens were subject to different levels of fatigue loading until failure, while four strengthened specimens were tested under monotonic loadings. Typical elastic-plastic behavior was observed in monotonic test, yielding of specimen occurred when the tensile strain of steel rebar reached around 0.2%. Most fatigue specimens failed by rebar rupture and small group of specimens failed by debonding between NSM and concrete. However, unstable crack propagation was also observed to occur with rebar rupture in certain specimens, especially specimens with lower fatigue load and longer fatigue life. The crack and deflection progression could be generally divided into three distinct stages: (1) initial stage with decelerating increase; (2) steady stage with increase of constant and small rate; (3) final unstable stage of accelerating increase, and the second stage occupied most of fatigue life. An analytical solution to the flexural response of the RC beams strengthened with NSM CFRP reinforcement is derived, using a trilinear bond-slip relation for the CFRP-epoxy interface and the previously derived theoretical solution to bond characteristics. As the analytical model provides solution to flexural response, an independent fatigue life prediction model is also developed for reinforced concrete beams strengthened with NSM FRP rods under flexural fatigue loading. The model is based on the fracture-mechanics approach using cohesive model and capable of predicting fatigue life due to rebar rupture, where the effect of cohesive stresses due to aggregate, steel rebar, NSM FRP reinforcement is approximated by specific cohesion laws.In conclusion, this dissertation presents thorough and detailed research to experimentally and analytically investigate the flexural behavior of NSM FRP beams, including the strain of FRP, rebar and concrete, deflection, and crack progression, etc. Moreover, approaches to address the fatigue life prediction is also proposed and verified by experimental results.
Book Synopsis Behavior of Prestressed Concrete Beams with CFRP Strands by :
Download or read book Behavior of Prestressed Concrete Beams with CFRP Strands written by and published by . This book was released on 2016 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The high cost of repairing reinforced or prestressed concrete structures due to steel corrosion has driven engineers to look for solutions. Much research has been conducted over the last two decades to evaluate the use of Fiber Reinforced Polymers (FRPs) in concrete structures. Structural engineering researchers have been testing FRP to determine their usability instead of steel for strengthening existing reinforced concrete structures, reinforcing new concrete members, and for prestressed concrete applications. The high strength-to-weight ratio of FRP materials, especially Carbon FRP (CFRP), and their non-corrosive nature are probably the most attractive features of FRPs. In this study, an experimental program was conducted to investigate the flexural behavior of prestressed concrete beams pre-tensioned with CFRP strands. The bond characteristics were examined by means of experimentally measuring transfer length, flexural bond length, and bond stress profiles. A total of four rectangular beams pre-tensioned with one 0.5-in. diameter CFRP strand were fabricated and tested under cyclic loading for five cycles, followed by a monotonically increasing load until failure. In investigating bond properties, the experimental results were compared to the equations available in the literature. The results from the four flexural tests showed that the main problem of CFRP strands, in addition to their liner-elastic tensile behavior, was lack of adequate bonding between FRP and concrete. Poor bonding resulted in early failure due to slippage between FRPs and concrete. As a result, a new technique was developed in order to solve the bonding issues and improve the flexural response of CFRP prestressed concrete beams. The new technique involved anchoring the CFRP strands at the ends of the concrete beams using a new "steel tube" anchorage system. It was concluded that the new technique solved the bond problem and improved the flexural capacity by about 46%. A computer model was created to predict the behavior of prestressed beams pre-tensioned with CFRP. The predicted behavior was compared to the experimental results. Finally, the experimental results were compared to the behavior of prestressed concrete beams pre-tensioned with steel strands as generated by the computer model. The CFRP beams showed higher strength but lower ductility.
Download or read book FRPRCS-5 written by C. J. Burgoyne and published by Thomas Telford. This book was released on 2001 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fibre reinforced plastics are increasingly being used as replacements for steel reinforcement in concrete structures. The reinforcement can be untensioned, or it can be in the form of prestressing tendons. It is also suitable for gluing onto the outside of a structure to improve flexural or shear performance. This book provides up-to-date research results to give engineers confidence in their design methods.
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 Composites for Construction by : Lawrence C. Bank
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
Book Synopsis Behavior of Reinforced Concrete Beams Retrofitted in Flexure Using CFRP-NSM Technique by :
Download or read book Behavior of Reinforced Concrete Beams Retrofitted in Flexure Using CFRP-NSM Technique written by and published by . This book was released on 2015 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: A variety of retrofitting methods are used to upgrade existing structures. For example, steel plates and Fiber Reinforced Polymer (FRP) jackets are externally bonded to members to increase their capacity in flexure and shear. However, due to the issue of corrosion these strengthening systems may lose their efficiency with time. FRP materials have been used to strengthen many structural components of different shapes and types. FRP jackets, FRP Strips, and FRP rods have commonly been used to rehabilitate existing structural components. The many advantages of using FRP as strengthening materials have made this material an attractive alternative: advantages such as lightweight, high strength, and ease of setting up. Among the many applications using FRP, Near Surface Mounted -- Fiber Reinforced polymer (NSM-FRP) is a promising technique used to strengthen concrete members. However, de-bonding issues have to be overcome to make this technique efficient and reliable. The NSM-FRP technique consists of making a groove along the surface of the concrete member to be retrofitted with depth less than the cover of the member. After cleaning the groove, epoxy paste is used to fill two-thirds of the groove's depth. The FRP element is then mounted in the groove. Finally, the groove is filled with epoxy and the excessive epoxy is leveled with surface of the concrete. This technique makes the FRP material completely covered by epoxy in the cover of the concrete. This method can be used for strengthening both the positive and negative moment regions of girders and slabs. Groove size, paste, concrete, and rods properties are the main variables that control the efficiency of the NSM-FRP rods. The main objective of this research project is to determine the behavior of reinforced concrete beams that are strengthened with NSM-CFRP reinforcement bars. In this research project, the bond characteristics of NSM-CFRP reinforcement bars are first determined from pullout tests. Then, NSM-CFRP rods are installed in reinforced concrete beams and the beams are tested. Loads, strains, and deflections are measured and theoretical and measured capacities are compared. Finally, the reliability and efficiency of using NSM-CFRP rods technique in retrofitting existing structures is observed.
Book Synopsis Non-Metallic (FRP) Reinforcement for Concrete Structures by : L. Taerwe
Download or read book Non-Metallic (FRP) Reinforcement for Concrete Structures written by L. Taerwe and published by CRC Press. This book was released on 1995-08-03 with total page 738 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dealing with a wide range of non-metallic materials, this book opens up possibilities of lighter, more durable structures. With contributions from leading international researchers and design engineers, it provides a complete overview of current knowledge on the subject.
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 Fibre-Reinforced Polymer Reinforcement for Concrete Structures by : Kiang Hwee Tan
Download or read book Fibre-Reinforced Polymer Reinforcement for Concrete Structures written by Kiang Hwee Tan and published by World Scientific. This book was released on 2003 with total page 1526 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :9782883940543 Total Pages :178 pages Book Rating :4.9/5 (45 download)
Book Synopsis Externally Bonded FRP Reinforcement for RC Structures by : fib Fédération internationale du béton
Download or read book Externally Bonded FRP Reinforcement for RC Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2001-01-01 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 1996, the then CEB established a Task Group with the main objective to elaborate design guidelines for the use of FRP reinforcement in accordance with the design format of the CEB-FIP Model Code and Eurocode2. With the merger of CEB and FIP into fib in 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. The Task Group consists of about 60 members, representing most European universities, research institutes and industrial companies working in the field of advanced composite reinforcement for concrete structures, as well as corresponding members from Canada, Japan and USA. Meetings are held twice a year and on the research level its work is supported by the EU TMR (European Union Training and Mobility of Researchers) Network "ConFibreCrete”. The work of fib TG 9.3 is performed by five working parties (WP): Material Testing and Characterization (MT&C) Reinforced Concrete (RC) Prestressed Concrete (PC) Externally Bonded Reinforcement (EBR) Marketing and Applications (M&A) This technical report constitutes the work conducted as of to date by the EBR party. This bulletin gives detailed design guidelines on the use of FRP EBR, the practical execution and the quality control, based on the current expertise and state-of-the-art knowledge of the task group members. It is regarded as a progress report since it is not the aim of this report to cover all aspects of RC strengthening with composites. Instead, it focuses on those aspects that form the majority of the design problems. several of the topics presented are subject of ongoing research and development, and the details of some modelling approaches may be subject to future revisions. as knowledge in this field is advancing rapidly, the work of the EBR WP will continue. Inspite of this limit in scope, considerable effort has been made to present a bulletin that is today’s state-of-art in the area of strengthening of concrete structures by means of externally bonded FRP reinforcement.
Book Synopsis Bond Behaviour of Beams Reinforced with Near Surface Mounted Carbon Fibre Reinforced Polymer Rods Under Fatigue Loading by : Noran Abdel Wahab
Download or read book Bond Behaviour of Beams Reinforced with Near Surface Mounted Carbon Fibre Reinforced Polymer Rods Under Fatigue Loading written by Noran Abdel Wahab and published by . This book was released on 2011 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past decade, extensive research has been conducted on the strengthening of reinforced concrete (RC) structures using externally bonded fibre reinforced polymer (FRP). More recently, near-surface mounted (NSM) FRP reinforcement has attracted an increasing amount of research as well as practical applications. In the NSM method, grooves are first cut into the concrete cover of an RC element and the FRP reinforcement is bonded inside the groove with an appropriate filler (typically epoxy paste or cement grout). The FRP reinforcement is either prestressed or non-prestressed depending on the required level of strengthening. In all cases, the bond between an NSM bar and the substrate material plays a key role in ensuring the effectiveness of NSM strengthening. The present work investigated experimentally the bond behaviour of non-prestressed and prestressed beams reinforced with near surface mounted carbon fibre reinforced polymer (CFRP) bars under monotonic and fatigue loading. Forty concrete beams were cast and tested in seven groups. The test variables considered in this study were: presence of internal steel reinforcement or not, the type of CFRP rod (spirally wound or sand coated) and the prestressing force (non-prestressed or prestressed).
Book Synopsis Strengthening of Concrete Structures Using Carbon Fibre Reinforced Polymers and Cement-based Adhesives by : Siavash Hashemi
Download or read book Strengthening of Concrete Structures Using Carbon Fibre Reinforced Polymers and Cement-based Adhesives written by Siavash Hashemi and published by . This book was released on 2011 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The research project conducted in this study concerns the investigation of the application of cement-based adhesives in CFRP strengthening of reinforced concrete members. The results demonstrate that mineral-based adhesives can provide the desired matrices for CFRP reinforcement. The literature review covers the background of CFRP application with conventional techniques. The bond characteristics of CFRP to concrete substrate, the flexural performance of retrofitted RC beams, and the failure modes at normal temperature are discussed. The guidelines for and numerical approaches to CFRP application are reviewed. Current studies of CFRP application at high temperature and related studies on the application of cement-based adhesive as bonding agent are investigated. The experimental work on the bond characteristics of CFRP material to concrete substrate using cement-based adhesive includes tests on single-lap shear. Results show that the cementitious adhesive can provide a reliable matrix for CFRP textiles to achieve certain bond stresses comparable to what can be achieved using conventional inorganic adhesives. The failure mode is debonding through the CFRP-mortar interface. The bond-slip relationship was extracted and later applied in finite element analysis.The experimental work on retrofitting of RC beams using cementitious adhesive showed that CFRP textile is the most compatible option with this new type of adhesive. The CFRP textile can improve the flexural ultimate strength of RC beams by 35%. The failure mode was intermediate debonding, similar to that achieved by using epoxy as reported in the research literature. A new type of anchorage was utilised for CFRP application using cementitious adhesive, which improved the ultimate capacity by 42%. The failure mode was concrete crushing on top, inferring that the full possible capacity of the beam was utilised.The experimental work pursued an investigation of flexural performance of retrofitted beams at high temperature. The results show that the retrofitted RC beam with cement-based adhesive had a considerable high temperature endurance compared to the specimens with epoxy. The failure temperature was 844°C. The proposed strengthening technique is therefore a reliable method for structures at high risk of fire exposure. The failure mode is intermediate debonding within a high moment region.Finite element analysis (FEA) was conducted to simulate and gain a better understating of the performance of retrofitted members. There was a good correlation between the empirical results and the FE analysis. Furthermore, FEA was used to simulate the performance of a retrofitted RC beam under fire, and to predict the fire endurance and failure mode of the beam.
Book Synopsis Bond Strength and Characteristics of Carbon Fibre Reinforced Plastic, CFRP, Bars in Concrete Beams by :
Download or read book Bond Strength and Characteristics of Carbon Fibre Reinforced Plastic, CFRP, Bars in Concrete Beams written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :2883940800 Total Pages :151 pages Book Rating :4.8/5 (839 download)
Book Synopsis FRP Reinforcement in RC Structures by : fib Fédération internationale du béton
Download or read book FRP Reinforcement in RC Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2007-01-01 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: fib Bulletin 40 deals mainly with the use of FRP bars as internal reinforcement for concrete structures. The background of the main physical and mechanical properties of FRP reinforcing bars is presented, with special emphasis on durability aspects. For each of the typical ultimate and serviceability limit states, the basic mechanical model is given, followed by different design models according to existing codes or design guidelines. Composite FRP materials are still relatively new in construction and most engineers are unfamiliar with their properties and characteristics. The second chapter of this bulletin therefore aims to provide practising engineers with the necessary background knowledge in this field, and also presents typical products currently available in the international market. The third chapter deals with the issue of durability and identifies the parameters that can lead to deterioration, which is necessary information when addressing design issues. A series of parameters is used to identify the allowable stress in the FRP after exposure for a specified period of time in a specific environment. The bulletin covers the issues of Ultimate Limit States (primarily dealing with flexural design), Serviceability Limit States (dealing with deflections and cracking), Shear and Punching Shear and Bond and Tension Stiffening. It provides not only the state-of-the-art but also in many cases ideas for the next generation of design guidelines. The final chapter deals with the fundamental issue of design philosophy. The use of these new materials as concrete reinforcement has forced researchers to re-think many of the fundamental principles used until now in RC design. The bulletin ends with a discussion of a possible new framework for developing partial safety factors to ensure specific safety levels that will be flexible enough to cope with new materials.
Download or read book ACI Structural Journal written by and published by . This book was released on 2004 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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
