Download or read book Strengthening of Concrete Beams by External Prestressing written by Iyad Abdurrahman Wehbe and published by . This book was released on 1992 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of external prestressing tendons as a means of strengthening or upgrading concrete flexural members was experimentally investigated. A total of 16 beam spec imens were tested. Each spec imen was first subjected to an amplitude fatigue loading at a constant load range varying between Pmin {Dead load) and Pmax (Dead load + excessive Live load) equal about 30* and 80* of the calculated nominal flexural resistance respectively. The spec imens were then externally prestressed while loaded with Pmin and subjected to monotonically increasing load to failure. Due to external prestressing, the induced fatigue deflections of the specimens were reduced by up to 75*, and the nominal flexural strengths were increased by up to 146*. External tendons with harped profile were relatively more effective in increasing the flexural strength as compared to tendons with straight horizontal profile. The stress ranges and mean stress levels in the Internal tension reinforcement were reduced considerably which imply a significant improvement in the fatigue life of the strengthened spec imens. The stress in the external prestressing steel at nominal flexural strength can be safely predicted using ACI code Eq. 18-4 proposed for internal unbonded tendons. Also, with slight modification to Eq. 18-3 of the ACI Building code to account for external tendons, the stress in the internal prestressing steel and the nominal flexural strength of concrete members strengthened using additional external tendons can be predicted using ACI code 318-89 procedure with reasonable accuracy.
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.
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.
Download or read book Strengthening Prestressed Beams Using Parafil Ropes as External Tendons written by Ahmed Hassan Ahmed Ghallab and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reinforced Concrete Structures written by Robert Park and published by John Wiley & Sons. This book was released on 1991-01-16 with total page 794 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sets out basic theory for the behavior of reinforced concrete structural elements and structures in considerable depth. Emphasizes behavior at the ultimate load, and, in particular, aspects of the seismic design of reinforced concrete structures. Based on American practice, but also examines European practice.
Download or read book EASEC16 written by Chien Ming Wang and published by Springer Nature. This book was released on 2020-12-22 with total page 2093 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents articles from The 16th East Asian-Pacific Conference on Structural Engineering and Construction, 2019, held in Brisbane, Australia. It provides a forum for professional engineers, academics, researchers and contractors to present recent research and developments in structural engineering and construction.
Download or read book The Strengthening of Concrete Beams by Externally Bonded Reinforcement written by Christopher James Tait and published by . This book was released on 1980 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Building Code Requirements for Structural Concrete written by ACI Committee 318 and published by American Concrete Institute. This book was released on 2002 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Concrete Beams with Openings written by M. A. Mansur and published by CRC Press. This book was released on 1999-01-29 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book compiles state-of-the-art information on the behavior, analysis, and design of concrete beams containing transverse openings. Discussions include the need, effects, and classification of openings as well as the general requirements for fulfilling design pure bending, combined bending, and shear - illustrated with numerical examples torsion alone or in combination with bending and shear large rectangular openings as well as opening size and location on beam behavior methods for analyzing ultimate strength and serviceability requirements effects of torsion in beams large openings in continuous beams and their effects on possible redistribution of internal forces as well as guidelines and procedures for the design of such beams effect of prestressing on the serviceability and strength of beams with web openings design against cracking at openings and ultimate loads Concrete Beams with Openings serves as an invaluable source of information for designers and practicing engineers, especially useful since little or no provision or guidelines are currently available in most building codes.
Download or read book Durability and Behavior of Prestressed Concrete Beams written by Edward F. O'Neil and published by . This book was released on 1976 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strengthening of reinforced concrete beams in shear using external unbonded reinforcement written by Jeremy Frederic David Grant and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book Externally applied FRP reinforcement for concrete structures written by FIB – International Federation for Structural Concrete and published by FIB - International Federation for Structural Concrete. This book was released on 2019-05-01 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 1996, 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 June 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. Finally, as a result of the restructuring of fib’s Commissions and Task Groups at the end of 2014, the Task Group became fib T5.1 FRP Reinforcement for concrete structures, chaired by Stijn Matthys at Ghent University, in Commission 5 Reinforcements. The work of former TG 9.3 and current T5.1 was performed by two working parties (WP), one of which is “Externally Applied Reinforcement” (EAR), which produced fib bulletin 14 “Externally bonded FRP reinforcement for RC structures” in July 2001. Following a number of years of relatively slow activity, the WP on externally applied reinforcement was reactivated and started working on an update of bulletin 14. The result of this work is summarised in the present technical report, which aims to give design guidelines on the use of externally applied FRP reinforcement (both externally bonded and near-surface mounted) for concrete structures. An attempt has been made to present some of the topics in a Eurocode-compatible format, so that the material covered may form the basis for the introduction of composites in the next version of Eurocode 2 and for the updating of the text on seismic retrofitting with composites in the next version of Eurocode 8. All persons who participated in the preparation of this Bulletin are mentioned in the copyright page. Further acknowledgements are due to Josée Bastien (Canada), Hans Rudolf Ganz (Switzerland) and Luc Taerwe (Belgium) for revision of the document. To all members of the working party on externally applied reinforcement our sincere thanks are expressed for the high quality and extensive work brought in on a voluntary basis.
Download or read book Basic Principles of Concrete Structures written by Xianglin Gu and published by Springer. This book was released on 2015-12-09 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the latest version of designing codes both for buildings and bridges (GB50010-2010 and JTG D62-2004), this book starts from steel and concrete materials, whose properties are very important to the mechanical behavior of concrete structural members. Step by step, analysis of reinforced and prestressed concrete members under basic loading types (tension, compression, flexure, shearing and torsion) and environmental actions are introduced. The characteristic of the book that distinguishes it from other textbooks on concrete structures is that more emphasis has been laid on the basic theories of reinforced concrete and the application of the basic theories in design of new structures and analysis of existing structures. Examples and problems in each chapter are carefully designed to cover every important knowledge point. As a basic course for undergraduates majoring in civil engineering, this course is different from either the previously learnt mechanics courses or the design courses to be learnt. Compared with mechanics courses, the basic theories of reinforced concrete structures cannot be solely derived by theoretical analysis. And compared with design courses, this course emphasizes the introduction of basic theories rather than simply being a translation of design specifications. The book will focus on both the theoretical derivations and the engineering practices.
Download or read book Experimental and Analytical Evaluation of the Behavior of Concrete T Beams with External Prestressing written by Nada Emile Khairallah and published by . This book was released on 1997 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: The behavior and flexural resistance of reinforced concrete T beams strengthened using external prestressing were experimentally and analytically investigated. The behavior at both serviceability and limit states were evaluated. A total of twelve beams was tested. The main test variables included ratio of the ordinary reinforcing steel, magnitude of the external prestressing force (or area of external prestressing steel), and profile of the external prestressing tendons. The results indicated clearly that external prestressing is a very powerful technique for strengthening concrete flexural members. The use of external prestressing delayed the formation of flexural cracks, reduced the service load deflections, enhanced the shear performance, and increased the ultimate flexural strength up to 14percent in comparison with conventional reinforced concrete specimens. However, the corresponding improvement in the strength and behavior is accompanied by reduction in the ductility of flexural failure. Everything else being constant, external tendons with deviated profile were more effective in increasing the flexural strength than tendons with straight profile. The experimental results were reproduced analytically using a nonlinear analysis method. The nonlinear analysis method requires constitutive analytical relationships of the stress-strain curves of the constituent materials, namely, concrete, prestressing steel, and ordinary steel, and iteration procedure to satisfy deformation compatibility and force equilibrium at every stage during the load-deformation response of the member. The analytical results based on nonlinear analysis were in very good agreement with the experimental results. Furthermore, comparison was made between the experimental results of the stress in the external prestressing steel and available design equations. Based on this comparison, it was found that the stress in the external prestressing steel and the nominal flexural resistance of externally prestressed members can be predicted with reasonable accuracy using the ACI Building Code approach for beams prestressed with internal unbonded tendons.
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 2004-06-02 with total page 736 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.
