Head and Bond Contributions to Anchorage of a Headed Reinforcing Bar
Head and Bond Contributions to Anchorage of a Headed Reinforcing Bar

Author: Andrew M. Blau

Publisher:

Published: 2010

Total Pages: 188

ISBN-13:

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Headed reinforcing bars are becoming more popular in the construction industry; however, there is relatively little known about the interaction of the head and bond in resisting loads. As such, the ACI 318-08 (the 2008 version being the current version) code equation governing headed reinforcing bars appears to be a gross generalization of the capacity of a headed bar. The purpose of this project was to study the contributions of the head and bond as they change with varying bond lengths, clear covers, and head bearing areas to determine if a better model can be developed to represent a headed bar. Twelve headed bar specimens were cast, each one with a unique combination of bone length, clear cover, and head bearing area, and loaded until failure. Two failure modes were observed: bar yielding and side blowout. The loads resisted by the head and bond throughout the loading of each specimen were analyzed for trends. It was determined that headed bars follow one of two patterns: head-dominated and bond-dominated, and is dependent on bond length. As such, different models should be used for the capacity of each pattern. The specimen capacities were compared to models proposed by others, and the current ACI 381-08 code equation. The ACI 318-08 code equation was found to be a good fit with a minor modification for the bond-dominated bars. It was determined to not be possible to develop a model for head-dominated bars from this test program and that additional testing must be conducted.

Connections between Steel and Concrete
Connections between Steel and Concrete

Author: Rolf Eligehausen

Publisher: ibidem-Verlag / ibidem Press

Published: 2012-02-27

Total Pages: 1430

ISBN-13: 383825807X

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Anchorage by fasteners and composite structures of steel and concrete have seen dramatic progress in research, technology and application over the past decades. The understanding of the fundamental principles underlying both disciplines has significantly improved. Concurrently, there has been rapid growth in the development of sophisticated new products and the establishment of international directives and codes to ensure their safe and economical use in a wide range of engineered structures. Although they deal with very similar problems, the two disciplines have developed independently from each other. To optimize the use of composite structures and fastenings to concrete, however, it is necessary to have knowledge of both: the local behavior of the fastening system and the global behavior of the structure. It became apparent that a forum offering the opportunity to expand and to exchange experience in the field of connecting steel and concrete would benefit all involved. Furthermore this forum would aid in the rapid dissemination of new ideas, technologies and solutions as well as explore new areas of research.This book forms the Proceedings of the 2 Symposium on “Connections between Steel and Concrete”. As the 1 Symposium in 2001 it brought together leading experts from all facets of the research, design, construction and anchor manufacturing community from around the world. Their lectures covered the topics:- test methods- behavior and design- dynamic loading: shock, earthquake, fatigue- durability- exceptional applications, strenghtening and structures- related topicsIn total 129 papers are gathered in these 2 volumes.

fib Model Code for Concrete Structures 2010
fib Model Code for Concrete Structures 2010

Author: fib - federation internationale du beton

Publisher: John Wiley & Sons

Published: 2013-12-04

Total Pages: 434

ISBN-13: 3433030618

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The International Federation for Structural Concrete (fib) is a pre-normative organization. 'Pre-normative' implies pioneering work in codification. This work has now been realized with the fib Model Code 2010. The objectives of the fib Model Code 2010 are to serve as a basis for future codes for concrete structures, and present new developments with regard to concrete structures, structural materials and new ideas in order to achieve optimum behaviour. The fib Model Code 2010 is now the most comprehensive code on concrete structures, including their complete life cycle: conceptual design, dimensioning, construction, conservation and dismantlement. It is expected to become an important document for both national and international code committees, practitioners and researchers. The fib Model Code 2010 was produced during the last ten years through an exceptional effort by Joost Walraven (Convener; Delft University of Technology, The Netherlands), Agnieszka Bigaj-van Vliet (Technical Secretary; TNO Built Environment and Geosciences, The Netherlands) as well as experts out of 44 countries from five continents.

Bond and anchorage of embedded reinforcement: Background to the fib Model Code for Concrete Structures 2010
Bond and anchorage of embedded reinforcement: Background to the fib Model Code for Concrete Structures 2010

Author: fib - Fédération internationale du béton

Publisher: fib - Fédération internationale du béton

Published: 2014-05-01

Total Pages: 177

ISBN-13: 2883941122

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As part of the preparation for the fib Model Code for Concrete Structures 2010, task group 4.5 Bond Models undertook a major review of rules for bond and anchorage of reinforcement in the CEB-FIP Model Code 1990. This bulletin presents the outcome of that review, describes the rationale for the revisions and presents the evidence on which the revisions are based. The principle changes in MC2010 include raising the limit on concrete strength that may be used when determining bond resistance to 110MPa, introduction of a coefficient η4 to cater for different reinforcement Classes, and coverage of new construction materials including epoxy coated and headed bars. The format of design rules has been changed to permit more rational treatment of confinement from concrete cover and transverse reinforcement, the contribution of end hooks and bends for tension bars, and end bearing to compression laps. New guidance is provided covering a range of construction techniques and service environments and the influence of long term degradation. Analyses of various aspects of detailing on performance of laps and anchorages have resulted in discontinuation of the ‘proportion lapped’ factor α6, alterations to requirements of transverse reinforcement at laps, and have resolved inconsistencies in provisions for bundled bars between major national codes. Apparent inconsistencies in existing rules for lapped joints and anchorages and between the local bond/slip model and design rules are also resolved, thus allowing integration of application rules and modelling. Finally, the basis for an attempt to introduce simple detailing rules for laps and anchorages is described.

Seismic Design of Reinforced Concrete Buildings
Seismic Design of Reinforced Concrete Buildings

Author: Jack Moehle

Publisher: McGraw Hill Professional

Published: 2014-10-06

Total Pages: 783

ISBN-13: 0071839453

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Complete coverage of earthquake-resistant concrete building design Written by a renowned seismic engineering expert, this authoritative resource discusses the theory and practice for the design and evaluation of earthquakeresisting reinforced concrete buildings. The book addresses the behavior of reinforced concrete materials, components, and systems subjected to routine and extreme loads, with an emphasis on response to earthquake loading. Design methods, both at a basic level as required by current building codes and at an advanced level needed for special problems such as seismic performance assessment, are described. Data and models useful for analyzing reinforced concrete structures as well as numerous illustrations, tables, and equations are included in this detailed reference. Seismic Design of Reinforced Concrete Buildings covers: Seismic design and performance verification Steel reinforcement Concrete Confined concrete Axially loaded members Moment and axial force Shear in beams, columns, and walls Development and anchorage Beam-column connections Slab-column and slab-wall connections Seismic design overview Special moment frames Special structural walls Gravity framing Diaphragms and collectors Foundations