A Theory For The Shear Behaviour Of Cracks Providing A Basis For The Assessment Of Cracked Reinforced Concrete Structures
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A Theory For The Shear Behaviour Of Cracks Providing A Basis For The Assessment Of Cracked Reinforced Concrete Structures
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Author : Paolo Martino Calvi
language : en
Publisher:
Release Date : 2015
A Theory For The Shear Behaviour Of Cracks Providing A Basis For The Assessment Of Cracked Reinforced Concrete Structures written by Paolo Martino Calvi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
A rational crack behaviour model capable of predicting and assessing the response of cracks in reinforced concrete (RC) elements subjected to complex stress states is presented. The model, referred to as Pure Mechanics Crack Model (PMCM), is formulated and developed in terms of first principles, namely equilibrium, compatibility and stress strain relationships and employs few empirical parameters. Instrumental in the development of the analytical model were the data collected from an extensive experimental campaign conducted as part of the research work. Eighteen pre-cracked RC panel elements were tested under combinations of cyclic or reversed cyclic shear and tension with the objective of investigating the shear behaviour of cracks in reinforced concrete elements. The data from the testing program were used to develop and verify the PMCM, and to extend the database available from the literature which is currently limited to pure shear tests. The results provided information regarding the mechanics involved in the shear response of cracks and demonstrated that rational models of such systems can be achieved. Relying on the experimental findings and building on the framework of the PMCM, a preliminary procedure for assessing the state of health and determining the reserve capacity of damaged RC structures was also developed. The analytical model, named the "Assessment of Cracked Reinforced Concrete" (ACRC) Model, is formulated in terms of global and local compatibility, equilibrium equations and employs appropriate constitutive relationships to link stress and strains when necessary. The input parameters for the ACRC Model are crack width, crack slip and crack orientation which can all be obtained from field measurements. The ACRC model allows a user to estimate the global stress and strain state of a cracked RC element, providing an estimate of its reserve capacity and potentially leading to a revised estimate of its ultimate strength.
Towards A Rational Understanding Of Shear In Beams And Slabs
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Author : fib Fédération internationale du béton
language : en
Publisher: FIB - Féd. Int. du Béton
Release Date : 2018-05-01
Towards A Rational Understanding Of Shear In Beams And Slabs written by fib Fédération internationale du béton and has been published by FIB - Féd. Int. du Béton this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-05-01 with Technology & Engineering categories.
Reliable performance of beams and slabs in shear is essential for the safety and also for the serviceability of reinforced concrete structures. A possible failure in shear is usually a brittle failure, which underlines the importance of the correct specification of the load carrying capacity in shear. The knowledge of performance in shear is steadily developing and it is now obvious that older structures were not always designed in accordance with contemporary requirements. The increasing load – mainly on bridges – requires the assessment of existing structures, often followed by their strengthening. An appropriate understanding of actual performance of concrete structures in shear is therefore of primary interest. The workshop which was held in Zürich in 2016 brought together a significant number of outstanding specialists working in the field of shear design, who had a chance to exchange their opinions and proposals for improving the current knowledge of shear behaviour in beams and slabs. The specialists came from different parts of the world, which made the workshop general and representative. The workshop was organised by fib Working Party 2.2.1 “Shear in Beams” (convened by O. Bayrak), which is a part of fib Commission 2 "Analysis and Design". Individual contributions mainly address shear in beams with low transversal reinforcement. It is crucial because many existing structures lack such reinforcement. Different theories, e.g. Critical Shear Crack Theory (CSCT), Modified Compression Field Theory (MCFT), Multi-Action Shear Model (MASM), etc. were presented and compared with procedures used in selected national codes or in the fib Model Code 2010. The models for shear design were often based to a great extent on empirical experience. The refined presented models tend to take into account the physical mechanisms in structures more effectively. A brittle behaviour in shear requires not only to check the equilibrium and failure load, but also to follow the progress of failure, including the crack development and propagation, stress redistribution, etc. The significance of the size effect – which causes the nominal strength of a large structure to be smaller than that of a small structure – was pointed out. Nowadays, the fibre reinforcement is used more than before since it allows significant labour costs savings in the construction industry. The contribution of fibres is suitable for shear transfer. It is very convenient that not only ordinary fibre reinforced elements were addressed but also the UHPFRC beams. The production of this new material is indeed growing, while the development of design recommendations has not been sufficiently fast. Fatigue resistance of structures with low shear reinforcement is also an important issue, which was also addressed in this bulletin. It cannot be neglected in prestressed bridges, which are exposed to dynamic loads. A comprehensive understanding of the shear behaviour is necessary. Although many laboratory experiments are carried out, they are suitable only to a limited extent. New testing methods are being developed and show promising results, e.g. digital image correlation. An actual structure performance should rather be tested on a large scale, ideally on real structures under realistic loading conditions.ii The papers presented in the bulletin are a basis for the discussion in view of the development of updated design rules for the new fib Model Code (MC2020), which is currently under preparation. fib Bulletins like this one, dealing with shear, help to transfer knowledge from research to design practice. The authors are convinced that it will lead to better new structures design of as well as to savings and to a safety increase in older existing structures, whose future is often decided now.
Computational Modelling Of Concrete Structures
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Author : Nenad Bicanic
language : en
Publisher: CRC Press
Release Date : 2014-03-04
Computational Modelling Of Concrete Structures written by Nenad Bicanic and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-03-04 with Technology & Engineering categories.
The EURO-C conference series (Split 1984, Zell am See 1990, Innsbruck 1994, Badgastein 1998, St Johann im Pongau 2003, Mayrhofen 2006, Schladming 2010, St Anton am Alberg 2014) brings together researchers and practising engineers concerned with theoretical, algorithmic and validation aspects associated with computational simulations of concrete and concrete structures. The conference reviews and discusses research advancements and the applicability and robustness of methods and models for reliable analysis of complex concrete, reinforced concrete and pre-stressed concrete structures in engineering practice. Conference topics and invited papers cover both computational mechanics and computational modelling aspects of the analysis and design of concrete and concrete structures: * Constitutive and Multiscale Modelling of Concrete * Advances in Computational Modelling * Time Dependent and Multiphysics Problems * Performance of Concrete Structures The book is of special interest to researchers in computational concrete mechanics, as well as industry experts in complex nonlinear simulations of concrete structures.
Proceedings Fib Symposium In Prague Vol1 Czech Republic
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Author : FIB – International Federation for Structural Concrete
language : en
Publisher: FIB - Féd. Int. du Béton
Release Date : 1999-10-01
Proceedings Fib Symposium In Prague Vol1 Czech Republic written by FIB – International Federation for Structural Concrete and has been published by FIB - Féd. Int. du Béton this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-10-01 with Technology & Engineering categories.
The Behaviour Of Reinforced Concrete Subjected To Reversed Cyclic Shear
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Author : David Michael Volpe Ruggiero
language : en
Publisher:
Release Date : 2015
The Behaviour Of Reinforced Concrete Subjected To Reversed Cyclic Shear written by David Michael Volpe Ruggiero and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Strength And Deformations Of Structural Concrete Subjected To In Plane Shear And Normal Forces
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Author : Walter Kaufmann
language : en
Publisher: Birkhäuser
Release Date : 2013-12-11
Strength And Deformations Of Structural Concrete Subjected To In Plane Shear And Normal Forces written by Walter Kaufmann and has been published by Birkhäuser this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-12-11 with Technology & Engineering categories.
The present doctoral thesis was developed within the framework of the research project "Deformation Capacity of Structural Concrete". This project aims at developing a consistent and experimentally verified theory of the deformation capacity of structural concrete. Previous work included the development of a theoretical model, the so-called Tension Chord Model, which allows a comprehensive description of the load-deforma tion behaviour of tension members in non-prestressed and prestressed concrete struc tures. The present work focuses on a new theoretical model, the so-called Cracked Mem brane Model. For members subjected to in-plane forces this new model combines the ba sic concepts of the modified compression field theory and the tension chord model. Crack spacings and tension stiffening effects in cracked membranes are determined from first principles and the link to plasticity theory methods is maintained since equilibrium conditions are formulated in terms of stresses at the cracks rather than average stresses between the cracks. The research project "Deformation Capacity of Structural Concrete" has been funded by the Swiss National Science Foundation and the Association of the Swiss Cement Pro ducers. This support is gratefully acknowledged. Zurich, July 1998 Prof. Dr. Peter Marti Abstract This thesis aims at contributing to a better understanding of the load-carrying and defor mational behaviour of structural concrete subjected to in-plane shear and normal forces.
Structural Integrity And Fracture
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Author : A.V. Dyskin
language : en
Publisher: CRC Press
Release Date : 2002-01-01
Structural Integrity And Fracture written by A.V. Dyskin and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-01-01 with Technology & Engineering categories.
Topics covered in this title include: the fracturing and damage of composite materials; ceramics; metals; and concretes and rocks at different scales in both monotonic and cyclic loading.
Analysis Of Concrete Structures By Fracture Mechanics
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Author : L. Elfgren
language : en
Publisher: CRC Press
Release Date : 2004-03-01
Analysis Of Concrete Structures By Fracture Mechanics written by L. Elfgren and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-03-01 with Architecture categories.
This book presents the latest research findings of the fast developing applications of fracture mechanics to concrete structures. Key papers from leading experts in the field describe existing and new modelling techniques in the analysis of materials and structures. The book explains the practical application of fracture mechanics to structural modelling, bending, shear, bond and anchorage. The proceedings of this RILEM Workshop will be an important reference for those engaged in design, development, research and teaching in the field of concrete structures.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Aeronautics categories.
Behavior And Analysis Of Reinforced Concrete Structures Under Alternate Actions Inducing Inelastic Response
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Author : FIB – International Federation for Structural Concrete
language : en
Publisher: FIB - International Federation for Structural Concrete
Release Date : 1994-05-01
Behavior And Analysis Of Reinforced Concrete Structures Under Alternate Actions Inducing Inelastic Response written by FIB – International Federation for Structural Concrete and has been published by FIB - International Federation for Structural Concrete this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-05-01 with Technology & Engineering categories.