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Author : W.T. Marshall
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (454 download)
Download or read book Control of Horizontal Cracking in the Ends of Pretensioned Prestressed Concrete Girders written by W.T. Marshall and published by . This book was released on 1962 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : William Thomas Marshall
Publisher :
ISBN 13 :
Total Pages : 19 pages
Book Rating : 4.:/5 (454 download)
Download or read book Control of Horizontal Cracking in the Ends of Pretensioned Prestressed Concrete Girders written by William Thomas Marshall and published by . This book was released on 1962 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Maher K. Tadros
Publisher : Transportation Research Board
ISBN 13 : 0309118352
Total Pages : 76 pages
Book Rating : 4.3/5 (91 download)
Download or read book Evaluation and Repair Procedures for Precast/prestressed Concrete Girders with Longitudinal Cracking in the Web written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2010 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report establishes a user's manual for the acceptance, repair, or rejection of precast/prestressed concrete girders with longitudinal web cracking. The report also proposes revisions to the AASHTO LRFD Bridge Design Specifications and provides recommendations to develop improved crack control reinforcement details for use in new girders. The material in this report will be of immediate interest to bridge engineers.
Author :
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (818 download)
Download or read book Nonlinear Analysis of Pretensioned Bridge Girder Ends to Understand and Control Cracking at Prestress Release written by and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hundreds of prestressed concrete girders are used each year for building bridges. Prestressed concrete girders are preferred due to their effective span to depth ratios, and higher durability characteristics. The prestress transfer from the prestressing strands to concrete takes place at the girder ends. Characteristic cracks form in this end region during or immediately after detensioning. These cracks are more severe for the heavily prestressed deep bulb tee girders with thin webs, creating durability concerns. The problem can be structurally hazardous if cracks form paths for corrosion agents to reach the steel strands. Cracks in the bottom flange closer to the strands can easily form such paths. This research primarily focused on the analyses of nonlinear prestressed girder end regions to understand and recommend control methods for girder end cracking. The behavior of the pretensioned girder ends was simulated using nonlinear finite element analysis. The accuracy of the models was ensured by including the concrete nonlinearity, strain softening and stress redistribution upon cracking. The finite element modeling techniques were verified by test data. The principal tensile strain patterns correlating with cracking were used to explain the reasons behind each type of crack. Potential solutions to control end cracking were examined via finite element models. The impact of end zone reinforcement pattern, debonding of strands, strand cutting order, draped strand pattern, and lifting of the girder on the cracks were evaluated. The reduction in principal tensile strains associated with cracking was quantified for each crack control method. The analysis results showed that debonding strands can effectively control cracking. Other methods improve the end zone strains however are not sufficient to eliminate cracking alone. Combining the solutions involving debonding, extra reinforcing in the web, and a controlled sequence of strand detensioning should lead to elimination of end cracking.
Author : Emre Kizilarslan
Publisher :
ISBN 13 :
Total Pages : 202 pages
Book Rating : 4.:/5 (959 download)
Download or read book De-bonding Strands as an Anchorage Zone Crack Control Method for Pretensioned Concrete Bulb-tee Bridge Girders Using Nonlinear Finite Element Analysis written by Emre Kizilarslan and published by . This book was released on 2016 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wisconsin bulb tee pretensioned concrete girders have being used for bridges. Their effective spans to depth ratios and higher durability have made prestressed concrete girders desirable. However, cracks were observed at the anchorage zones of these girders because of the demand. To satisfy demand, these girders are heavily prestressed. Cracks initiate during detensioning of pretensioned strands and grow more while transporting them to the resting beds. These cracks create durability concerns as cracks lead aggressive salty water to the steel strands, endangering structures' stability. Especially, cracks in the bottom flange closer to the strands are main concerns in this research. This research primarily focused on the analyses of prestressed girder ends with modelling with nonlinear material properties to understand and recommend control methods for girder end cracking. The end zone behavior of the pretensioned girder was modelled using nonlinear material properties. The concrete nonlinearity, strain softening and stress redistribution upon cracking were also included in the behavior and the verification of tests were done by real tests on these girders. Finally, the reasons for cracks were explained by examining the principal tensile strain directions. The results of previous study showed that debonding strands can effectively control cracking. In this thesis, only debonding for cracking control method, therefore, was tested on 72W with 48 strands and 54W with 42 strands WI girders to see the real effect of debonding on anchorage zone cracks. After getting good results from tests and verifying them with Finite Element Analysis models, exact debonding percentages for other girders to eliminate cracks were presented by giving results of FEA models built for each of them.
Author : Rafik Y. Itani
Publisher :
ISBN 13 :
Total Pages : 140 pages
Book Rating : 4.:/5 (1 download)
Download or read book Design of Prestressed Concrete Girders Without End Blocks written by Rafik Y. Itani and published by . This book was released on 1986 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Michael G. Oliva
Publisher :
ISBN 13 :
Total Pages : 134 pages
Book Rating : 4.:/5 (891 download)
Download or read book Finite Element Analysis of Deep Wide-flanged Pre-stressed Girders to Understand and Control End Cracking written by Michael G. Oliva and published by . This book was released on 2011 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Chris P. Pantelides
Publisher :
ISBN 13 :
Total Pages : 68 pages
Book Rating : 4.3/5 (555 download)
Download or read book Repair of Prestressed Concrete Girder Ends and Girder Collision Repair written by Chris P. Pantelides and published by . This book was released on 2010 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Fiber reinforced polymer composites are an increasingly popular material that can be used for bridge girder retrofit/repair. The purpose of this research, therefore, is to develop methods and design guidelines for repair and retrofit of bridge girders suffering (1) shear strength deficiencies related to end cracking and (2) flexural strength deficiencies related to vehicular collision. Scaled test specimens were fabricated and subjected to cyclic loading in order to instigate damage similar to that caused by end cracking and vehicular collision. Subsequently, the damaged specimens were repaired with external post-tensioned carbon fiber rods and re-tested to failure. This report presents the data from the tests and design guidelines for the use of external post-tensioned carbon fiber rods for repair applications.
Author : R. I. Gilbert
Publisher : CRC Press
ISBN 13 : 9780044454038
Total Pages : 528 pages
Book Rating : 4.4/5 (54 download)
Download or read book Design of Prestressed Concrete written by R. I. Gilbert and published by CRC Press. This book was released on 1990-09-13 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: Providing both an introduction to basic concepts and an in-depth treatment of the most up-to-date methods for the design and analysis of concrete of structures, "Design of Prestressed Concrete" will service the needs of both students and professional engineers.
Author : Jessica Lauren Salazar
Publisher :
ISBN 13 :
Total Pages : 352 pages
Book Rating : 4.:/5 (15 download)
Download or read book End-region Behavior of Precast, Prestressed Concrete I-girders Employing 0.7-inch Diameter Prestressing Strands written by Jessica Lauren Salazar and published by . This book was released on 2016 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Pretensioned concrete girders are currently fabricated using 0.5- or 0.6-in. diameter prestressing strands. In recent years, however, it has become of interest to employ larger-diameter 0.7-in. diameter strands to reduce the number of strands and improve the efficiency of pretensioned concrete members. Such a transition requires a considerable initial investment that needs to be justified based on the benefits obtained. Furthermore, the use of 0.7-in. strands would increase the stresses within the end-region of pretensioned elements, which could lead to undesirable cracking and impact the serviceability of the girders. The work presented in this thesis consists of 1) a comprehensive parametric investigation to evaluate the benefits and limitations of using 0.7-in. strands in pretensioned bridge girders, and 2) a full-scale experimental study to investigate the behavior of pretensioned concrete girders with 0.7-in. strands at the time of prestress transfer. The parametric investigation was accomplished by designing thousands of bridge girders with different span lengths, concrete release strengths, and transverse spacings. The results showed that the most noticeable benefit of 0.7-in. strands over 0.6-in. strands was a reduction of up to 35 percent in the number of strands. However, the difference in the total weight of prestressing steel was insignificant. Increasing the release strength of concrete, at least to 7.5 ksi, was found essential to observe benefits in design aspects other than the number of strands. The experimental investigation involved the fabrication of two Tx46 and two Tx70 specimens at the Ferguson Structural Engineering Laboratory. All specimens employed 0.7-in. strands on a 2- by 2-in. grid and the standard detailing currently used for girders with smaller-diameter strands. The observed crack widths in the specimens upon prestress transfer did not exceed those typically observed in Tx-girders with smaller-diameter strands. Therefore, the use of 0.7-in. strands does not seem to trigger a need to modify the end-region detailing in Tx-girders. However, noticeably greater bursting and spalling forces were observed in the end regions of the specimens compared to the demands predicted by AASHTO LRFD provisions. The measured 24-hour transfer length from the specimens also exceeded estimates by AASHTO LRFD and ACI 318-14 provisions.
Author : Fritz Leonhardt
Publisher :
ISBN 13 : 9780804445849
Total Pages : 677 pages
Book Rating : 4.4/5 (458 download)
Download or read book Prestressed Concrete Design and Construction written by Fritz Leonhardt and published by . This book was released on 1980-01-01 with total page 677 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Raymond Ian Gilbert
Publisher : CRC Press
ISBN 13 : 1466572779
Total Pages : 710 pages
Book Rating : 4.4/5 (665 download)
Download or read book Design of Prestressed Concrete to AS3600-2009 written by Raymond Ian Gilbert and published by CRC Press. This book was released on 2016-02-17 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of structures in general, and prestressed concrete structures in particular, requires considerably more information than is contained in building codes. A sound understanding of structural behaviour at all stages of loading is essential. This textbook presents a detailed description and explanation of the behaviour of prestressed concret
Author : Praveen Nagarajan
Publisher : Pearson Education India
ISBN 13 : 9332517614
Total Pages : 328 pages
Book Rating : 4.3/5 (325 download)
Download or read book Prestressed Concrete Structures written by Praveen Nagarajan and published by Pearson Education India. This book was released on 2013 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is suited for a first course in pre-stressed concrete design offered to senior undergraduate students in civil engineering and postgraduate students in structural engineering. The book focuses on the behaviour of the pre-stressed concrete structural elements. Carefully-chosen worked examples are included to delineate the design aspects while relevant chapter-end questions enable effortless recapitulation of the subject. The content, while being useful to both the students and teachers, will also serve as an invaluable reference for engineers.
Author : Maher K. Tadros
Publisher : Transportation Research Board
ISBN 13 : 030908766X
Total Pages : 73 pages
Book Rating : 4.3/5 (9 download)
Download or read book Prestress Losses in Pretensioned High-strength Concrete Bridge Girders written by Maher K. Tadros and published by Transportation Research Board. This book was released on 2003 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The HCM includes three printed volumes (Volumes 1-3) that can be purchased from the Transportation Research Board in print and electronic formats. Volume 4 is a free online resource that supports the rest of the manual. It includes: Supplemental chapters 25-38, providing additional details of the methodologies described in the Volume 1-3 chapters, example problems, and other resources; A technical reference library providing access to a significant portion of the research supporting HCM methods; Two applications guides demonstrating how the HCM can be applied to planning-level analysis and a variety of traffic operations applications; Interpretations, updates, and errata for the HCM (as they are developed);A discussion forum allowing HCM users to ask questions and collaborate on HCM-related matters; and Notifications of chapter updates, active discussions, and more via an optional e-mail notification feature."--Publisher.
Author : Raymond Ian Gilbert
Publisher : CRC Press
ISBN 13 : 1315389509
Total Pages : 674 pages
Book Rating : 4.3/5 (153 download)
Download or read book Design of Prestressed Concrete to Eurocode 2, Second Edition written by Raymond Ian Gilbert and published by CRC Press. This book was released on 2017-01-27 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt: The design of structures in general, and prestressed concrete structures in particular, requires considerably more information than is contained in building codes. A sound understanding of structural behaviour at all stages of loading is essential. This textbook presents a detailed description and explanation of the behaviour of prestressed concrete members and structures both at service loads and at ultimate loads and, in doing so, provide a comprehensive and up-to-date guide to structural design. Much of the text is based on first principles and relies only on the principles of mechanics and the properties of concrete and steel, with numerous worked examples. However, where the design requirements are code specific, this book refers to the provisions of Eurocode 2: Design of Concrete Structures and, where possible, the notation is the same as in Eurocode 2. A parallel volume is written to the Australian Standard for Concrete Structures AS3600-2009. The text runs from an introduction to the fundamentals to in-depth treatments of more advanced topics in modern prestressed concrete structures. It suits senior undergraduate and graduate students and also practising engineers who want comprehensive introduction to the design of prestressed concrete structures. It retains the clear and concise explanations and the easy-to-read style of the first edition, but the content has been extensively re-organised and considerably expanded and updated. New chapters cover design procedures, actions and loads; prestressing systems and construction requirements; connections and detailing; and design concepts for prestressed concrete bridges. The topic of serviceability is developed extensively throughout. All the authors have been researching and teaching the behaviour and design of prestressed concrete structures for over thirty-five years and the proposed new edition of the book reflects this wealth of experience. The work has also gained much from Professor Gilbert active and long-time involvement in the development of standards for concrete buildings and concrete bridges.
Author : Michael G. Oliva
Publisher :
ISBN 13 :
Total Pages : 191 pages
Book Rating : 4.:/5 (961 download)
Download or read book Implementation and Field Evaluation of Pretensioned Concrete Girder End Crack Control Methods written by Michael G. Oliva and published by . This book was released on 2016 with total page 191 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Donald Wilson Boyd
Publisher :
ISBN 13 :
Total Pages : 152 pages
Book Rating : 4.:/5 (29 download)
Download or read book The Determination of End-zone Stresses in Prestressed Concrete Beams written by Donald Wilson Boyd and published by . This book was released on 1970 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
