In most continuous structures secondary moments have the effect. Durability design systems control entry of deicing salts and protect reinforcing steel even when chloride ions penetrate the concrete. Guidance on grouting was previously given in tr 47. General overview of posttensioned concrete design instructor. This report is the last technical report from a comprehensive research. Durable bonded posttensioned concrete bridges concrete society technical report concrete society download bok. May 04, 2016 this report is a revision of the 2nd edition of technical report 47, durable posttensioned concrete bridges, which was published by the concrete society in 2002. The design steps for a post tensioned composite bridge. Durable posttensioned concrete bridges an update and background to concrete society report tr47 second edition 26 june 2002 gordon clark. Krauser march 15, 2007 unbonded posttensioning is an efficient structural system that has successfully been used worldwide in construction. Posttensioned concrete is a very common type of concrete structure for parking garages today and can be constructed below grade or above grade. Durable posttensioned concrete structures technical report 72. Material related to tr43 is included in the international edition of this book.
In post tensioned structure, the tensioning of reinforcement is done after the concrete has been placed. Construction technology of posttensioned structures. Concrete society this report is a revision of the 2nd edition of technical report 47, durable posttensioned concrete bridges, which was published by the concrete society in 2002. Our major aim is to improve the performance of posttensioned concrete structures through the use of optimal design in terms of material and shape. Ccip publications are produced by the concrete society on behalf of the cement and concrete industry publications forum. Concrete society technical report 2002, durable posttensioned concrete structures, tr 72. The economic downturn of recent years delayed our goal to consistently publish the journal twice a year, but now we are back on our track to provide the journal semiannually to our readers and authors. Grouted bonded posttensioned construction for buildings 73. Revised by technical report 72 durable posttensioned concrete structures, concrete society 2010 ccip047. Advantages and benefits of unbonded posttensioning march 15, 2007 page 2 of 2 construction advantages of unbonded posttensioned structures compared to steel, nonprestressed concrete, and precast construction include. For further guidance on grouting see tr 72, durable posttensioned concrete structures. These thin cylindrical shells of either castinplace or precast concrete are commonly used for liquid and bulk storage.
Durable posttensioned concrete structures tr72 concrete. Progressive collapse resistance of reinforced and post tensioned concrete flat plate structures a dissertation presented by leila keyvani to the department of civil and environmental engineering in partial fulfillment of the requirements for the degree of doctor of philosophy in the field of structural engineering northeastern university. Specific design requirements for concrete floor construction are found in aci 360r for slabsonground, aci 223r for shrinkagecompensating concrete floors, and aci 421. Progressive collapse resistance of reinforced and post. The main objective of the bulletin is to point out the benefits of using posttensioning for. Tr 72 durable posttensioned concrete structures publication year 2010. Posttensioned slabs reinforced concrete shear walls. Tr 72 durable posttensioned concrete structures publication year 2010 document status latest version of document. This is a great medium to share your research and significant post tensioned structures with a. Tr43 posttensioned concrete floors the concrete bookshop. It includes practical recommendations for design of posttensioned floor systems in building construction. Tr 72 durable posttensioned concrete structures, concrete. Posttensioning contractors shall have cares certification for the.
This course is intended to be an introductory course for structural engineers new to post tensioned. Leaking epoxy joints in segmental deckleaking epoxy joints. Structural assessments should be conducted by a qualified structural engineer. Durable bonded posttensioned concrete bridges concrete. This report is a revision of the 2nd edition of technical report 47, durable posttensioned concrete bridges, which was published by the concrete society in 2002. After a brief introduction to current posttensioning systems and construction practice, the seminar continues with the economics of both grouted and unbonded options, and covers the practical design concepts and design procedures for beams, oneway and column supported twoway flat slab construction. Balance loads reduce the load on the columns and foundations. In general, durability performance of posttensioned concrete bridges in.
Grouting of posttensioned tendons concrete society. The use of posttensioned concrete floors in buildings has been consistently growing in recent years. Report of a concrete society working party in collaboration with the concrete bridge development group. Controlled demolition of an unbonded posttensioned concrete slab, posttensioning institute, phoenix, 1989. The system can be configured in shortspan, twoway slabs or in longspan, beam and slab systems. Crack prediction methods for prestressed concrete members are presented. Performance of precast segmental concrete beams posttensioned with carbon fiberreinforced polymer. Environmental impact assessment of post tensioned and. Vertical posttensioning is often incorpo rated in the walls as part of the vertical reinforcement. Posttensioned concrete is accomplished by tensioning high strength steel cables within the concrete mass. They are typically supported on concrete columns and perimeter foundation walls. Tr43 posttensioned concrete floors design handbook. Concrete bridge design and construction series simon bourne.
There are a wide range of advantages and benefits for large as well as small projects. Demolition of posttensioned concrete structures presents the contractor with unique issues. Post tensioned concrete is a very common type of concrete structure for parking garages today and can be constructed below grade or above grade. Post tensioned slabs reinforced concrete shear walls.
To achieve these goals, redundant durability systems are needed, that is, if one system fails, a backup system must come into play. Posttensioned basics and principles bryan allred, s. Posttensioned pt concrete floors are now widely used in the uk, particularly for highrise buildings. A more detailed guide to the design of pt floors can be found in the concrete societys technical report 43 tr43. This article provides information on how to scheme a pt slab and how the use of posttensioning affects the rest of the structure. Durability of posttensioned concrete structures authors.
Post tensioned concrete is accomplished by tensioning high strength steel cables within the concrete mass. Introduction to posttensioning, posttensioning systems, and posttensioning hardware construction technology of posttensioned structures. Stateoftheart report about durability of posttensioned. The pt book the myths about pt posttensioned concrete is crack free. Durable posttensioned concrete structures the construction. Posttensioned floors can be constructed using either bonded or unbonded tendons. This book is destined to become the definitive work on the design of posttensioned concrete buildings for.
Concrete society technical report 72, durable posttensioned concrete structures, provides engineers with authoritative, practical guidance on designing. Since we will be dealing only with posttensioned concrete structures in this course, that is, structures that are first castinplace and then posttensioned in place, we will only. Western concrete structures after fierce 56 year struggle, atlas wins battle of marketplace by late 1960s buttonheaded tendons became extinct virtually all building pt has been with strand tendons ever since. Tr 47 durable bonded posttensioned concrete bridges. Model specification bonded and unbonded posttensioned.
Revises the 2nd edition and expands the scope to include buildings, this document aims to improve design, detailing, specifications, materials. A programme of posttensioned concrete bridge special inspections ptsi undertaken in the uk in the. The quality of a concrete floor or slab is highly dependent on achieving a hard and durable surface that is flat, relatively free of cracks, and at the proper grade and elevation. Reported by committee 302 american concrete institute. Advantages and benefits of unbonded posttensioning by larry b. The posttech range of pt corrosion solutions is utilized as part of an overall strategy for the evaluation, identification, and protection of posttensioned concrete structures. It has been revised over the years and is now technical report no 72 concrete society. After a brief introduction to current post tensioning systems and construction practice, the seminar continues with the economics of both grouted and unbonded options, and covers the practical design concepts and design procedures for beams, oneway and column supported twoway flat slab construction. Fundamentals of post tensioned design for buildings. Posttensioned parking structures can last 60 years or more when designed for durability. The rise in the use of posttensioning for buildings, and particularly for car parks, led to the need to expand the scope of the technical report to include such structures.
An appendix for the structural design of foundations using limit state philosophy as foreseen by envec7, has also been included. Vector posttechtm pt corrosion evaluation unbonded post. Manual for the design of reinforced concrete building. Cares model specification for posttensioned slabs uk cares. Restraint cracks and their mitigation in unbonded posttensioned building structures, american concrete institute, sp1, 1989, also posttensioning institute 1988, pp. Effective inspection and monitoring of posttensioned. Fundamentals of posttensioned concrete design for buildings part one. Durability systems for posttensioned concrete parking. Grout for prestressing tendons the concrete society. Post tensioned parking structures can last 60 years or more when designed for durability. Revises technical report 47 durable bonded posttensioned concrete bridges, 2nd edition concrete.
Grouting of posttensioned tendons the concrete society. Normally, half the total shrinkage takes place in the first month after transfer and. Posttensioning in buildings foreword working party wp1. Fundamentals of posttensioned concrete design for buildings. Concrete bookshop members receive 40% discount on concrete society publications. Posttension concrete slab in this example posttensioned cables are introduced on a concrete slab. The main objective of the bulletin is to point out the benefits of using post tensioning for.
Structural concrete structures reinforced concrete construction. The advantages of posttensioned structures a technique that allows long beams lengths to be achieved reduces deflections and allows highspan depth ratios improves durability by the reduction or elimination of cracking more efficient utilization of steel and concrete material. Tensioned concrete design for buildings part three by john p. Model specification for the design and performance of post. This is a great medium to share your research and significant posttensioned structures with a. Controlled demolition of an unbonded post tensioned concrete slab, post tensioning institute, phoenix, 1989. Performance of precast segmental concrete beams posttensioned with. Image durable post tensioned concrete structures tr72 concrete bridge development group july 2011 gordon clarkgordon clark director ramboll, former chairman gifford. Demolition of post tensioned concrete structures presents the contractor with unique issues. Post tensioning tendon installation and grouting manual fhwa. A suncam online continuing education course fundamentals of post. Tr 72 durable post tensioned concrete bridge prestressed. End span external tendon in spanbyspan structure figure 4.
It includes practical recommendations for design of post tensioned floor systems in building construction. Anchorage determination of anchorage zone stresses in posttensioned beams by magnels method, guyons method and is43 code design of anchorage zone reinforcement check for transfer bond length in pretensioned beams. Effective inspection and monitoring of posttensioned structures. Reference should also be made to concrete society technical report no 72 for aggressive. Chapter 5 addresses the design of concrete floors as it relates to their constructibility. In order to take into account longterm losses, the user would estimate these losses and simply include. Tr 72 durable posttensioned concrete structures, concrete society. Tr 72 durable post tensioned concrete bridge free download as pdf file. The design steps for a two way post tensioned slab was prepared according to the simple hand calculation provided by pca portland cement association as well as the aci 31805 code requirements. This slab will be modeled as a 2delement, allowing the analysis to be run in a general xyz environment. The design steps for a posttensioned composite bridge. This method is achieved in a process where metal or plastic tubes which contain loose tensioning cables or rods are cast into the concrete. Most modern browsers have builtin pdf readers if you have problems opening this file in your browser, check your browsers or computer systems settings. Durability systems for posttensioned concrete parking structures.
Mnsea minnesota structural engineers association seminar and trade show may 9, 2017 posttensioned concrete structures session 1 posttensioned concrete basics and principles posttensioning is an efficient and economical tool for. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. In response to this, environmental impact assessment of post tensioned and reinforced concrete slab construction. Progressive collapse resistance of reinforced and posttensioned concrete flat plate structures a dissertation presented by leila keyvani to the department of civil and environmental engineering in partial fulfillment of the requirements for the degree of doctor of philosophy in the field of structural engineering northeastern university. Anchorage design beam structure prestressed concrete. In posttensioned structure, the tensioning of reinforcement is done after the concrete has been placed. This report is part of project 01405, durability design of posttensioned bridge substructure elements. Conclusions, recommendations, and design guidelines for. The advantages of post tensioned structures a technique that allows long beams lengths to be achieved reduces deflections and allows highspan depth ratios improves durability by the reduction or elimination of cracking more efficient utilization of steel and concrete material. May post tensioned concrete structures engineering. Jpcea 2001, manual for maintenance of prestressed concrete bridges. Durable posttensioned concrete structures tr72 concrete bridge development group july 2011. Corrugated metal ducts are the most economical means to create a void for the tensile elements.
Restraint cracks and their mitigation in unbonded post tensioned building structures, american concrete institute, sp1, 1989, also post tensioning institute 1988, pp. The design steps for a two way posttensioned slab was prepared according to the simple hand calculation provided by pca portland cement association as well as the aci 31805 code requirements. Current post tensioning systems and construction practice in buildings and parking structures economic advantages of post tensioning in building construction concepts and procedures and details of post tensioning latest design code provisions for design of post tensioned structures bs110, ec2, aci, international building code. Revises technical report 47 durable bonded posttensioned concrete bridges, 2nd edition concrete society, 2001. In this paper we analyse the various forms and types posttensioned concrete and the ideal mix ratio that result in the most durable posttensioned concrete. A programme of post tensioned concrete bridge special inspections ptsi undertaken in the uk in the. Concrete society technical report 72, durable posttensioned concrete structures, provides engineers with authoritative, practical guidance on designing, specifying and constructing durable posttensioned concrete bridges. Tr43 posttensioned concrete floors design handbook amendment. This course is intended as an introductory course for structural engineers new to posttensioned concrete design and is a refresher for experienced structural engineers. Guidance on grouting was previously given in tr 47, durable posttensioned concrete bridges, which was originally published in 1996 and was revised in 2002.
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