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Within this work a material law was developed which correctly describes the creep and relaxation characteristics of young and mature normal strength and high-strength concretes. It is based on an aging thermodynamically sound rheological model and considers the complex nonlinear creep behavior under constant and variable stresses. In case of relaxation the corresponding integral relation is solved by means of a numerical algorithm.
Book Synopsis Stoffgesetz zur Beschreibung des Kriech- und Relaxationsverhaltens junger normal- und hochfester Betone by : Anders, Isabel
Download or read book Stoffgesetz zur Beschreibung des Kriech- und Relaxationsverhaltens junger normal- und hochfester Betone written by Anders, Isabel and published by KIT Scientific Publishing. This book was released on 2014-05-22 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Within this work a material law was developed which correctly describes the creep and relaxation characteristics of young and mature normal strength and high-strength concretes. It is based on an aging thermodynamically sound rheological model and considers the complex nonlinear creep behavior under constant and variable stresses. In case of relaxation the corresponding integral relation is solved by means of a numerical algorithm.
Im Rahmen der vorliegenden Dissertation wurde ein Stoffgesetz entwickelt, welches das Kriech- und Relaxationsverhalten normal- und hochfester Betone sowohl im sehr jungen als auch im höheren Belastungsalter korrekt zu beschreiben vermag. Es basiert auf einer Reihenschaltung verschiedener rheologischer Grundelemente, deren alternde mechanische Kennwerte innerhalb des gesamten Gültigkeitsbereichs des Modells thermodynamisch widerspruchsfrei definiert sind. Das Stoffgesetz berücksichtigt das komplexe nichtlineare Kriechverhalten unter konstanten und veränderlichen Spannungen. Für den Fall der Relaxation erfolgt die Lösung der zugrundeliegenden Integralbeziehung anhand eines numerischen Algorithmus. Grundlage für die Entwicklung und Optimierung des Modells bildete ein umfassendes Versuchsprogramm zum Kriechen und der Relaxation von im jungen Alter belasteten Betonen. Für die Verknüpfung der dort gewonnenen Erkenntnisse mit dem Spannungs-Dehnungs-Zeitverhalten von Beton mit höheren Belastungsaltern wird auf den in der Literatur veröffentlichten Kenntnisstand zurückgegriffen.
Book Synopsis Stoffgesetz zur Beschreibung des Kriech- und Relaxationsverhaltens junger normal- und hochfester Betone by : Isabel Anders
Download or read book Stoffgesetz zur Beschreibung des Kriech- und Relaxationsverhaltens junger normal- und hochfester Betone written by Isabel Anders and published by Beuth Verlag GmbH. This book was released on 2017-04-24 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Im Rahmen der vorliegenden Dissertation wurde ein Stoffgesetz entwickelt, welches das Kriech- und Relaxationsverhalten normal- und hochfester Betone sowohl im sehr jungen als auch im höheren Belastungsalter korrekt zu beschreiben vermag. Es basiert auf einer Reihenschaltung verschiedener rheologischer Grundelemente, deren alternde mechanische Kennwerte innerhalb des gesamten Gültigkeitsbereichs des Modells thermodynamisch widerspruchsfrei definiert sind. Das Stoffgesetz berücksichtigt das komplexe nichtlineare Kriechverhalten unter konstanten und veränderlichen Spannungen. Für den Fall der Relaxation erfolgt die Lösung der zugrundeliegenden Integralbeziehung anhand eines numerischen Algorithmus. Grundlage für die Entwicklung und Optimierung des Modells bildete ein umfassendes Versuchsprogramm zum Kriechen und der Relaxation von im jungen Alter belasteten Betonen. Für die Verknüpfung der dort gewonnenen Erkenntnisse mit dem Spannungs-Dehnungs-Zeitverhalten von Beton mit höheren Belastungsaltern wird auf den in der Literatur veröffentlichten Kenntnisstand zurückgegriffen.
An innovative strengthening technique for the seismic retrofitting of masonry buildings is the fabric-reinforced cementitious matrix (FRCM). The system presented in this work is EQ-GRID, which consists of a multi-axial hybrid grid made of alkali-resistant glass and polypropylene fibres and a natural hydraulic lime mortar (NHL) as matrix. The results of the performed experimental campaign and the numerical modelling with the Equivalent frame method are presented and discussed in this work.
Book Synopsis Experimental characterization and modelling of textile reinforced masonry structures with the Equivalent frame method by : Rizzo, Stefania
Download or read book Experimental characterization and modelling of textile reinforced masonry structures with the Equivalent frame method written by Rizzo, Stefania and published by KIT Scientific Publishing. This book was released on 2022-09-09 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: An innovative strengthening technique for the seismic retrofitting of masonry buildings is the fabric-reinforced cementitious matrix (FRCM). The system presented in this work is EQ-GRID, which consists of a multi-axial hybrid grid made of alkali-resistant glass and polypropylene fibres and a natural hydraulic lime mortar (NHL) as matrix. The results of the performed experimental campaign and the numerical modelling with the Equivalent frame method are presented and discussed in this work.
Book Synopsis Seismic soil structure interaction of navigation locks by : Maltidis, Georgios
Download or read book Seismic soil structure interaction of navigation locks written by Maltidis, Georgios and published by KIT Scientific Publishing. This book was released on 2017-12-20 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Influence of elevated temperatures up to 100 °C on the mechanical properties of concrete by : Acosta Urrea, Fernando
Download or read book Influence of elevated temperatures up to 100 °C on the mechanical properties of concrete written by Acosta Urrea, Fernando and published by KIT Scientific Publishing. This book was released on 2018-08-03 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
fib Model Code 2010 represents the state-of-the-art of code-type models for structural behaviour of concrete. It comprises constitutive relations and material models together with the most important explanatory notes. However the underlying normative work, i.e. the fundamental data as well as the considerations and discussions behind the formulas could not be given within the Model Code text. Based on various experiences gained after the publication of Model Code 1990 this lacking background information will lead in the following to numerous questions arising from Model Code users. Consequently the present bulletin claims to conquer this general weakness of codes in a way to guard against any future misunderstandings of the Model Code 2010 related to its chapter 5.1 (Concrete). It discusses the given formulas in connection with experimental data and the most important international literature. The constitutive relations or material models, being included in MC1990 and forming the basis and point of origin of the Task Group’s work, were critically evaluated, if necessary and possible adjusted, or replaced by completely new approaches. Major criteria have been the physical and thermodynamical soundness as well as practical considerations like simplicity and operationality. This state-of-the-art report is intended for practicizing engineers as well as for researchers and represents a comprehensible summary of the relevant knowledge available to the members of the fib Task Group 8.7 at the time of its drafting. Besides the fact that the bulletin is a background document for Chapter 5.1 of MC2010, it will provide an important foundation for the development of future generations of code-type models related to the characteristics and the behaviour of structural concrete. Further it will offer insights into the complexity of the normative work related to concrete modelling, leading to a better understanding and adequate appreciation of MC2010.
Book Synopsis Code-type models for concrete behaviour by : fib Fédération internationale du béton
Download or read book Code-type models for concrete behaviour written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2013-11-01 with total page 202 pages. Available in PDF, EPUB and Kindle. Book excerpt: fib Model Code 2010 represents the state-of-the-art of code-type models for structural behaviour of concrete. It comprises constitutive relations and material models together with the most important explanatory notes. However the underlying normative work, i.e. the fundamental data as well as the considerations and discussions behind the formulas could not be given within the Model Code text. Based on various experiences gained after the publication of Model Code 1990 this lacking background information will lead in the following to numerous questions arising from Model Code users. Consequently the present bulletin claims to conquer this general weakness of codes in a way to guard against any future misunderstandings of the Model Code 2010 related to its chapter 5.1 (Concrete). It discusses the given formulas in connection with experimental data and the most important international literature. The constitutive relations or material models, being included in MC1990 and forming the basis and point of origin of the Task Group’s work, were critically evaluated, if necessary and possible adjusted, or replaced by completely new approaches. Major criteria have been the physical and thermodynamical soundness as well as practical considerations like simplicity and operationality. This state-of-the-art report is intended for practicizing engineers as well as for researchers and represents a comprehensible summary of the relevant knowledge available to the members of the fib Task Group 8.7 at the time of its drafting. Besides the fact that the bulletin is a background document for Chapter 5.1 of MC2010, it will provide an important foundation for the development of future generations of code-type models related to the characteristics and the behaviour of structural concrete. Further it will offer insights into the complexity of the normative work related to concrete modelling, leading to a better understanding and adequate appreciation of MC2010.
Book Synopsis Nachhaltiges Bauen mit ultra-hochfestem Beton by : Michael Schmidt
Download or read book Nachhaltiges Bauen mit ultra-hochfestem Beton written by Michael Schmidt and published by kassel university press GmbH. This book was released on 2014 with total page 813 pages. Available in PDF, EPUB and Kindle. Book excerpt:
fib Bulletin 34 addresses Service Life Design (SLD) for plain concrete, reinforced concrete and pre-stressed concrete structures, with a special focus on design provisions for managing the adverse effects of degradation. Its objective is to identify agreed durability related models and to prepare the framework for standardization of performance based design approaches. Four different options for SLD are given: - a full probabilistic approach, - a semi probabilistic approach (partial factor design), - deemed to satisfy rules, - avoidance of deterioration. The service life design approaches described in this document may be applied for the design of new structures, for updating the service life design if the structure exists and real material properties and/or the interaction of environment and structure can be measured (real concrete covers, carbonation depths), and for calculating residual service life. The bulletin is divided into five chapters: 1. General 2. Basis of design 3. Verification of Service Life Design 4. Execution and its quality management 5. Maintenance and condition control It also includes four informative annexes, which give background information and examples of procedures and deterioration models for the application in SLD. The format of Bulletin 34 follows the CEB-FIP tradition for Model Codes: the main provisions are given on the right-hand side of the page, and on the left-hand side, the comments. Note: An Italian translation of Bulletin 34 is also available; contact us for further details.
Book Synopsis Model Code for Service Life Design by : fib Fédération internationale du béton
Download or read book Model Code for Service Life Design written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2006-01-01 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: fib Bulletin 34 addresses Service Life Design (SLD) for plain concrete, reinforced concrete and pre-stressed concrete structures, with a special focus on design provisions for managing the adverse effects of degradation. Its objective is to identify agreed durability related models and to prepare the framework for standardization of performance based design approaches. Four different options for SLD are given: - a full probabilistic approach, - a semi probabilistic approach (partial factor design), - deemed to satisfy rules, - avoidance of deterioration. The service life design approaches described in this document may be applied for the design of new structures, for updating the service life design if the structure exists and real material properties and/or the interaction of environment and structure can be measured (real concrete covers, carbonation depths), and for calculating residual service life. The bulletin is divided into five chapters: 1. General 2. Basis of design 3. Verification of Service Life Design 4. Execution and its quality management 5. Maintenance and condition control It also includes four informative annexes, which give background information and examples of procedures and deterioration models for the application in SLD. The format of Bulletin 34 follows the CEB-FIP tradition for Model Codes: the main provisions are given on the right-hand side of the page, and on the left-hand side, the comments. Note: An Italian translation of Bulletin 34 is also available; contact us for further details.
Presents the proceedings of the 5th RILEM International Symposium, held in Barcelona in September 1993. The papers discuss creep and shrinkage of concrete, and should be of interest to cement and concrete technologists and researchers, as well as structural engineers.
Book Synopsis Creep and Shrinkage of Concrete by : Z. P. Bažant
Download or read book Creep and Shrinkage of Concrete written by Z. P. Bažant and published by Spon Press. This book was released on 1993-01-01 with total page 934 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents the proceedings of the 5th RILEM International Symposium, held in Barcelona in September 1993. The papers discuss creep and shrinkage of concrete, and should be of interest to cement and concrete technologists and researchers, as well as structural engineers.
Serviceability failures of concrete structures involving excessive cracking or deflection are relatively common, even in structures that comply with code requirements. This is often as a result of a failure to adequately account for the time-dependent deformations of concrete in the design of the structure. The serviceability provisions embodied in codes of practice are relatively crude and, in some situations, unreliable and do not adequately model the in-service behaviour of structures. In particular, they fail to adequately account for the effects of creep and shrinkage of the concrete. Design for serviceability is complicated by the non-linear and inelastic behaviour of concrete at service loads. Providing detailed information, this book helps engineers to rationally predict the time-varying deformation of concrete structures under typical in-service conditions. It gives analytical methods to help anticipate time-dependent cracking, the gradual change in tension stiffening with time, creep induced deformations and the load independent strains caused by shrinkage and temperature changes. The calculation procedures are illustrated with many worked examples. A vital guide for practising engineers and advanced students of structural engineering on the design of concrete structures for serviceability and provides a penetrating insight into the time-dependent behaviour of reinforced and prestressed concrete structures.
Book Synopsis Time-Dependent Behaviour of Concrete Structures by : Raymond Ian Gilbert
Download or read book Time-Dependent Behaviour of Concrete Structures written by Raymond Ian Gilbert and published by CRC Press. This book was released on 2010-09-15 with total page 423 pages. Available in PDF, EPUB and Kindle. Book excerpt: Serviceability failures of concrete structures involving excessive cracking or deflection are relatively common, even in structures that comply with code requirements. This is often as a result of a failure to adequately account for the time-dependent deformations of concrete in the design of the structure. The serviceability provisions embodied in codes of practice are relatively crude and, in some situations, unreliable and do not adequately model the in-service behaviour of structures. In particular, they fail to adequately account for the effects of creep and shrinkage of the concrete. Design for serviceability is complicated by the non-linear and inelastic behaviour of concrete at service loads. Providing detailed information, this book helps engineers to rationally predict the time-varying deformation of concrete structures under typical in-service conditions. It gives analytical methods to help anticipate time-dependent cracking, the gradual change in tension stiffening with time, creep induced deformations and the load independent strains caused by shrinkage and temperature changes. The calculation procedures are illustrated with many worked examples. A vital guide for practising engineers and advanced students of structural engineering on the design of concrete structures for serviceability and provides a penetrating insight into the time-dependent behaviour of reinforced and prestressed concrete structures.
