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Author : Yoon-Si Lee
Publisher :
ISBN 13 : 9783659276736
Total Pages : 0 pages
Book Rating : 4.2/5 (767 download)
Download or read book Use of CFRP in Strengthening Steel Girder Bridges written by Yoon-Si Lee and published by . This book was released on 2012-10-16 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Ahmed Sabri Abd-El-Meguid
Publisher :
ISBN 13 :
Total Pages : 215 pages
Book Rating : 4.:/5 (681 download)
Download or read book Strengthening Steel Bridge Girders Using CFRP written by Ahmed Sabri Abd-El-Meguid and published by . This book was released on 2010 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt: While traditional retrofitting methods for steel bridge girders could be time consuming and uneconomical, an alternative repair method is suggested using Carbon Fiber Reinforced Polymers (CFRP) laminate strips, providing engineers with a competitive solution that will increase the life-cycle of repaired bridges. This study investigated its feasibility as an option to strengthen and rehabilitate steel bridges. The main advantages of using CFRP laminates are their light weight and durability, which results in ease of handling and maintenance. The research conducted experimental and analytical work to evaluate the effectiveness of strengthening steel beams by the use of novel CFRP laminate strips configurations. The research involved the testing of five experimental composite beams, in addition to the development of approximately 100 finite element models. The results showed a significant gain in the beam's elastic and ultimate capacities. The conclusion is that there are specific sensitive parameters controlling the effectiveness of the CFRP laminate rehabilitation technique. An adequate AASHTO design of the rehabilitation method, which takes into consideration the effective parameters, would result in an effective bridge structure.
Author : Heinz Konietzky
Publisher : CRC Press
ISBN 13 : 9789058096807
Total Pages : 1022 pages
Book Rating : 4.0/5 (968 download)
Download or read book Numerical Modelling of Discrete Materials in Geotechnical Engineering, Civil Engineering and Earth Sciences written by Heinz Konietzky and published by CRC Press. This book was released on 2004-10-15 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this fully up-to-date volume, important new developments and applications of discrete element modelling are highlighted and brought together for presentation at the First International UDEC/3DEC Symposium. Papers covered the following key areas: * behaviour of masonry structures (walls, bridges, towers, columns) * stability and deformation of tunnels and caverns in fractured rock masses * geomechanical modelling for mining and waste repositories * rock reinforcement design (anchors, shotcrete, bolts) * mechanical and hydro-mechanical behaviour of dams and foundations * rock slope stability, deformation and failure mechanisms * modelling of fundamental rock mechanical problems * modelling of geological processes * constitutive laws for fractured rock masses and masonry structures * dynamic behaviour of discrete structures. Numerical Modelling of Discrete Materials in Geotechnical Engineering, Civil Engineering, and Earth Sciences provides an ultra-modern, in-depth analysis of discrete element modelling in a range of different fields, thus proving valuable reading for civil, mining, and geotechnical engineers, as well as other interested professionals.
Author : Jacob Hans Goebel
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (81 download)
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.
Author : Terry J. Wipf
Publisher :
ISBN 13 :
Total Pages : 88 pages
Book Rating : 4.:/5 (1 download)
Download or read book Evaluation of Post-tension Strengthened Steel Girder Bridge Using FRP Bars written by Terry J. Wipf and published by . This book was released on 2003 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many state, county, and local agencies are faced with deteriorating bridge infrastructure composed of a large percentage of relatively short to medium span bridges. In many cases, these older structures are rolled or welded longitudinal steel stringers acting compositely with a reinforced concrete deck. Most of these bridges, although still in service, need some level of strengthening due to increases in legal live loads or loss of capacity due to deterioration. Although these bridges are overstressed in most instances, they do not warrant replacement; thus, structurally efficient but cost-effective means of strengthening needs to be employed. In the past, the use of bolted steel cover plates or angles was a common retrofit option for strengthening such bridges. However, the time and labor involved to attach such a strengthening system can sometimes be prohibitive. This project was funded through the Federal Highway Administration's Innovative Bridge Research and Construction program. The goal is to retrofit an existing structurally deficient, three-span continuous steel stringer bridge using an innovative technique that involves the application of post-tensioning forces; the post-tensioning forces were applied using fiber reinforced polymer post-tensioning bars. When compared to other strengthening methods, the use of carbon fiber reinforced polymer composite materials is very appealing in that they are highly resistant to corrosion, have a low weight, and have a high tensile strength. Before the post-tensioning system was installed, a diagnostic load test was conducted on the subject bridge to establish a baseline behavior of the unstrengthened bridge. During the process of installing the post-tensioning hardware and stressing the system, both the bridge and the post-tensioning system were monitored. The installation of the hardware was followed by a follow-up diagnostic load test to assess the effectiveness of the post-tensioning strengthening system. Additional load tests were performed over a period of two years to identify any changes in the strengthening system with time. Laboratory testing of several typical carbon fiber reinforced polymer bar specimens was also conducted to more thoroughly understand their behavior. This report documents the design, installation, and field testing of the strengthening system and bridge.
Author : Jacob Hans Goebel
Publisher :
ISBN 13 :
Total Pages : 119 pages
Book Rating : 4.:/5 (81 download)
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.
Author : L. Taerwe
Publisher : CRC Press
ISBN 13 : 9780419205401
Total Pages : 738 pages
Book Rating : 4.2/5 (54 download)
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.
Author : L C Hollaway
Publisher : Elsevier
ISBN 13 : 1845694899
Total Pages : 415 pages
Book Rating : 4.8/5 (456 download)
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
Author : Nader Ghafoori
Publisher : CRC Press
ISBN 13 : 1439859434
Total Pages : 1890 pages
Book Rating : 4.4/5 (398 download)
Download or read book Challenges, Opportunities and Solutions in Structural Engineering and Construction written by Nader Ghafoori and published by CRC Press. This book was released on 2009-10-29 with total page 1890 pages. Available in PDF, EPUB and Kindle. Book excerpt: Challenges, Opportunities and Solutions in Structural Engineering and Construction addresses the latest developments in innovative and integrative technologies and solutions in structural engineering and construction, including: Concrete, masonry, steel and composite structures; Dynamic impact and earthquake engineering; Bridges and
Author : Ahmed Sabri Abd-El-Meguid
Publisher :
ISBN 13 :
Total Pages : 215 pages
Book Rating : 4.:/5 (52 download)
Download or read book Strengthening and Rehabilitation of Steel Bridge Girders Using CFRP Laminates written by Ahmed Sabri Abd-El-Meguid and published by . This book was released on 2008 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Kaustubh Dasgupta
Publisher : Springer Nature
ISBN 13 : 3030263657
Total Pages : 960 pages
Book Rating : 4.0/5 (32 download)
Download or read book Proceedings of SECON'19 written by Kaustubh Dasgupta and published by Springer Nature. This book was released on 2019-12-17 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers peer-reviewed contributions presented at the 3rd National Conference on Structural Engineering and Construction Management (SECON’19), held in Angamaly, Kerala, India, on 15-16 May 2019. The meeting served as a fertile platform for discussion, sharing sound knowledge and introducing novel ideas on issues related to sustainable construction and design for the future. The respective contributions address various aspects of numerical modeling and simulation in structural engineering, structural dynamics and earthquake engineering, advanced analysis and design of foundations, BIM, building energy management, and technical project management. Accordingly, the book offers a valuable, up-to-date tool and essential overview of the subject for scientists and practitioners alike, and will inspire further investigations and research.
Author : John C. Ward
Publisher :
ISBN 13 :
Total Pages : 75 pages
Book Rating : 4.:/5 (115 download)
Download or read book Carbon Fiber Shear Reinforcement for Prestressed Bridge Girders written by John C. Ward and published by . This book was released on 2017 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt: Corrosion of reinforcing steel reduces life spans of bridges throughout the United States; therefore, using non-corroding carbon fiber reinforced polymer (CFRP) reinforcement is seen as a way to increase service life. The use of CFRP as the flexural reinforcement in bridge girders has been extensively studied. However, CFRP transverse reinforcement has not been investigated as rigorously, and many of those studies have focused on carbon fiber composite cable (CFCC®) stirrups. The use of C-Grid® or NEFMACTM grid as options for transverse reinforcing has not been previously investigated. This testing program first determined the mechanical properties of C-Grid and NEFMAC grid and their respective development lengths. Five 18-ft long, 19-in deep beams were fabricated to test the C-Grid and NEFMAC, as well as conventional steel and CFCC stirrups. The beams were loaded with a single point load closer to one end of the beam to create a larger shear load for a given moment. Overall beam displacement was measured, and beams were fitted with rosettes and instrumentation to capture initiation of shear cracking. Test results were compared to theoretical shear capacities calculated using four different methods. The design method which provided the best prediction of shear strength was the AASHTO modified compression field theory, using equations for [beta] and [theta]. The manufacturer's guaranteed tensile strength should be used for design, as long as that strength is the average strength, as determined by at least five tests, reduced by three standard deviations. Shear cracks were controlled to a similar width as in beams with steel stirrups when at least two layers of grid were in place. An additional study was undertaken to determine if CFRP grids, either alone or in combination with traditional steel stirrups, could be used to control cracking in the end zones of pretensioned I-beams. Unfortunately, it was determined that, due to its low modulus, the amount of CFRP grid required to control cracking in the end zones was not economically feasible. Nevertheless, this study concluded that C-Grid and NEFMAC grid are both viable shear reinforcement options outside of the end regions. This report presents the initial recommendations for design.
Author : Xiao-Ling Zhao
Publisher : CRC Press
ISBN 13 : 0203895215
Total Pages : 289 pages
Book Rating : 4.2/5 (38 download)
Download or read book FRP-Strengthened Metallic Structures written by Xiao-Ling Zhao and published by CRC Press. This book was released on 2013-09-13 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Repairing or strengthening failing metallic structures traditionally involves using bulky and heavy external steel plates that often pose their own problems. The plates are generally prone to corrosion and overall fatigue. Fiber-reinforced polymer (FRP), a composite material made of a polymer matrix reinforced with fibers, offers a great alternativ
Author : Nasim Uddin
Publisher : Elsevier
ISBN 13 : 0857098950
Total Pages : 565 pages
Book Rating : 4.8/5 (57 download)
Download or read book Developments in Fiber-Reinforced Polymer (FRP) Composites for Civil Engineering written by Nasim Uddin and published by Elsevier. This book was released on 2013-05-15 with total page 565 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of fiber-reinforced polymer (FRP) composite materials has had a dramatic impact on civil engineering techniques over the past three decades. FRPs are an ideal material for structural applications where high strength-to-weight and stiffness-to-weight ratios are required. Developments in fiber-reinforced polymer (FRP) composites for civil engineering outlines the latest developments in fiber-reinforced polymer (FRP) composites and their applications in civil engineering. Part one outlines the general developments of fiber-reinforced polymer (FRP) use, reviewing recent advancements in the design and processing techniques of composite materials. Part two outlines particular types of fiber-reinforced polymers and covers their use in a wide range of civil engineering and structural applications, including their use in disaster-resistant buildings, strengthening steel structures and bridge superstructures. With its distinguished editor and international team of contributors, Developments in fiber-reinforced polymer (FRP) composites for civil engineering is an essential text for researchers and engineers in the field of civil engineering and industries such as bridge and building construction. Outlines the latest developments in fiber-reinforced polymer composites and their applications in civil engineering Reviews recent advancements in the design and processing techniques of composite materials Covers the use of particular types of fiber-reinforced polymers in a wide range of civil engineering and structural applications
Author : Damian I. Kachlakev
Publisher :
ISBN 13 :
Total Pages : 186 pages
Book Rating : 4.3/5 (555 download)
Download or read book Strengthening Bridges Using Composite Materials written by Damian I. Kachlakev and published by . This book was released on 1998 with total page 186 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this research project is to outline methodologies for using Fiber Reinforced Polymer (FRP) composites to strengthen and rehabilitate reinforced concrete bridge elements. Infrastructure deterioration and bridge strengthening techniques using FRP materials are discussed as background. Properties and classifications of different reinforcing fibers and resin matrices are provided, along with the mechanical properties of the FRP composites. Basic concepts and design principles for composite FRP materials are introduced, and topics such as manufacturing processes, anisotropic elasticity, strength of anisotropic materials, and micro-mechanics are presented. Techniques and concepts for strengthening concrete beams with FRP composites are discussed, as are flexural and shear strengthening design and construction methodologies. The worldwide research experience in the behavior of FRP strengthened beams under various conditions are summarized. External reinforcement of concrete columns using FRP materials is examined. Theoretical background, factors influencing the performance of FRP wrapped columns, and various case studies are presented. Design methodologies and examples supplement the case studies for both beams and columns. Most FRP material systems available on the market today are summarized and evaluated. Construction and durability requirements of the retrofitted systems are presented. Reliability assessment, condition evaluation methods, and factors influencing the strengthening quality are included. The various steps of the construction process, such as selection of a composite strengthening system, concrete surface preparation, and bond between FRP and concrete are summarized. Quality control, environmental durability of FRP composites, and cost effectiveness are presented.
Download or read book Bond Characteristics and Environmental Durability of CFRP Materials for Strengthening Steel Bridges and Structures written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents the findings of a research program that was conducted in two parts to investigate the bond behavior and environmental durability of carbon fiber reinforced polymer (CFRP) materials for strengthening steel bridges and structures. The first part of the research consisted of an experimental and analytical research program to investigate the bond characteristics of CFRP lap-splice joints. The experimental program included a total of eight double-lap shear tests and ten steel beam tests. The main parameters considered include the geometric configuration of the plate ends, the length of the splice plates and the use of mechanical anchorage near the plate ends. A finite element analysis was conducted to determine the distribution of the stresses within the adhesive layer for different splice configurations. The findings indicate that the presence of the reverse tapered plate end reduced the magnitude of the peak stresses in the adhesive layer thereby increasing the tension strength of the splice joints. Increasing the splice length and installing additional mechanical anchorage did not enhance the strength of the joints. Based on the findings, a method is proposed to design lap-splice joints for implementation of the proposed CFRP system on longer-span flexural members. The second part of the research consisted of a total of 44 steel-CFRP double-lap shear tests to study the environmental durability of the proposed CFRP strengthening system. The specimens were exposed to accelerated corrosion conditions and subsequently loaded monotonically to failure. The additional use of a silane adhesion promoter or a glass fiber insulating layer, to enhance the bond durability, was also studied. The findings indicate that the presence of the glass fiber layer enhanced the initial bond strength of the system, while the use of a silane adhesion promoter was essential to ensure the durability of the system. The findings of this research program demonstrate that.
Author : Fabio Biondini
Publisher : CRC Press
ISBN 13 : 0203103386
Total Pages : 4119 pages
Book Rating : 4.2/5 (31 download)
Download or read book Bridge Maintenance, Safety, Management, Resilience and Sustainability written by Fabio Biondini and published by CRC Press. This book was released on 2012-06-21 with total page 4119 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Maintenance, Safety, Management, Resilience and Sustainability contains the lectures and papers presented at The Sixth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2012), held in Stresa, Lake Maggiore, Italy, 8-12 July, 2012. This volume consists of a book of extended abstracts (800 pp) Extensive collection of revised expert papers on recent advances in bridge maintenance, safety, management and life-cycle performance, representing a major contribution to the knowledge base of all areas of the field.
