Time-dependent Behavior of Reinforced Concrete Structures

Time-dependent Behavior of Reinforced Concrete Structures
Author: Lawrence G. Selna
Publisher:
Total Pages: 175
Release: 1967
Genre: Reinforced concrete construction
ISBN:

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A mathematical model is developed for the study of time-dependent behavior of reinforced concrete frame structures. The model is formulated to account for creep, cracking, and drying shrinkage in the concrete. The output from the model includes forces, stresses, strains, and displacements in the structure. The model is formulated on the basis of idealizations in time and geometry. The idealization of incrementing the time is an expedient for integration of the hereditary strain-stress law for concrete. A linear law in functional form provides an accurate description of concrete strain-stress behavior within design stress ranges. The geometric idealizations are made so that the stiffness of the structures may be found. The structural members are divided into length increments and each length increment is divided into depth increments so that the bending and axial stiffness of a reinforced concrete member may be evaluated. (Author).

Time-Dependent Behaviour of Concrete Structures

Time-Dependent Behaviour of Concrete Structures
Author: Raymond Ian Gilbert
Publisher: CRC Press
Total Pages: 447
Release: 2010-09-15
Genre: Technology & Engineering
ISBN: 1482288710

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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

Time-Dependent Behaviour of Concrete Structures

Time-Dependent Behaviour of Concrete Structures
Author: Raymond Ian Gilbert
Publisher: CRC Press
Total Pages: 447
Release: 2010-09-21
Genre: Technology & Engineering
ISBN: 0203879392

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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.

American Environmentalism

American Environmentalism
Author: J. Michael Martinez
Publisher: CRC Press
Total Pages: 1227
Release: 2013-06-20
Genre: Law
ISBN: 0415633184

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Protecting the natural environment and promoting sustainability have become important objectives, but achieving such goals presents myriad challenges for even the most committed environmentalist. American Environmentalism: Philosophy, History, and Public Policy examines whether competing interests can be reconciled while developing consistent, coherent, effective public policy to regulate uses and protection of the natural environment without destroying the national economy. It then reviews a range of possible solutions. The book delves into key normative concepts that undergird American perspectives on nature by providing an overview of philosophical concepts found in the western intellectual tradition, the presuppositions inherent in neoclassical economics, and anthropocentric (human-centered) and biocentric (earth-centered) positions on sustainability. It traces the evolution of attitudes about nature from the time of the Ancient Greeks through Europeans in the Middle Ages and the Renaissance, the Enlightenment and the American Founders, the nineteenth and twentieth centuries, and up to the present. Building on this foundation, the author examines the political landscape as non-governmental organizations (NGOs), industry leaders, and government officials struggle to balance industrial development with environmental concerns. Outrageous claims, silly misrepresentations, bogus arguments, absurd contentions, and overblown prophesies of impending calamities are bandied about by many parties on all sides of the debate—industry spokespeople, elected representatives, unelected regulators, concerned citizens, and environmental NGOs alike. In lieu of descending into this morass, the author circumvents the silliness to explore the crucial issues through a more focused, disciplined approach. Rather than engage in acrimonious debate over minutiae, as so often occurs in the context of "green" claims, he recasts the issue in a way that provides a cohesive look at all sides. This effort may be quixotic, but how else to cut the Gordian knot?

Proceedings fib Symposium in Stuttgart

Proceedings fib Symposium in Stuttgart
Author: FIB – International Federation for Structural Concrete
Publisher: FIB - Féd. Int. du Béton
Total Pages: 1168
Release: 2008-09-01
Genre: Technology & Engineering
ISBN:

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International RILEM Conference on Early-Age and Long-Term Cracking in RC Structures

International RILEM Conference on Early-Age and Long-Term Cracking in RC Structures
Author: Fragkoulis Kanavaris
Publisher: Springer Nature
Total Pages: 406
Release: 2021-05-18
Genre: Technology & Engineering
ISBN: 3030729214

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This volume gathers the latest advances, innovations and applications in the field of crack control in concrete, as presented by leading international researchers and engineers at the International RILEM Conference on Early-age and Long-term Cracking in RC Structures (CRC 2021), held in Paris, France on April 9, 2021. It covers early-age and long-term imposed deformations in concrete, analytical formulations for calculating crack widths in concrete, numerical simulations of early-age and long-term restrained behaviour of concrete elements, experimental investigations on cracking, on-site monitoring of imposed deformations and cracking, crack control and repair, and sustainability of design and remediation. The conference demonstrated that a comprehensive approach to this problem requires the design of robust experimental techniques, the development of multiscale models and the evaluation of code-based and other analytical approaches relevant to crack control in concrete. The contributions, which were selected through a rigorous international peer-review process, share exciting ideas that will spur novel research directions and foster new multidisciplinary collaborations.