[PDF] Thermal And Structural Finite Elements Analysis Of Early Age Mass Concrete Structures eBook

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Page : pages
File Size : 26,45 MB
Release : 1905
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In the early stages of erected concrete structures, temperature rise occurs due to hydration of cement. Two theoretical models, namely, a transient thermal model and a transient stress model are developed to predict the behaviour of young concrete. The models account for several factors such as arbitrary concrete block pour history, convective heat exchange between concrete and air, and a variable modulus of elasticity. First, a model of concrete test specimens prepared as part of this research program was used to investigate what ultimately drives the potential for failure. Subsequently, the specimen size is enlarged and the size effect is captured. In addition, the pour time effect is analyzed. Finally, a model, which presents an actual dam's upper structure (two blocks), is analyzed. The numerical analysis is carried out using commercial software, which uses the finite element method revealed the magnitude and the internal residual stress distribution. (Abstract shortened by UMI.).

Author : Zhu Bofang
Publisher : Butterworth-Heinemann
Page : 525 pages
File Size : 25,50 MB
Release : 2013-12-11
Category : Technology & Engineering
ISBN : 0124078540

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Methods of controlling mass concrete temperatures range from relatively simple to complex and from inexpensive too costly. Depending on a particular situation, it may be advantageous to use one or more methods over others. Based on the author’s 50 years of personal experience in designing mass concrete structures, Thermal Stresses and Temperature Control of Mass Concrete provides a clear and rigorous guide to selecting the right techniques to meet project-specific and financial needs. New techniques such as long time superficial thermal insulation, comprehensive temperature control, and MgO self-expansive concrete are introduced. Methods for calculating the temperature field and thermal stresses in dams, docks, tunnels, and concrete blocks and beams on elastic foundations Thermal stress computations that take into account the influences of all factors and simulate the process of construction Analytical methods for determining thermal and mechanical properties of concrete Formulas for determining water temperature in reservoirs and temperature loading of arched dams New numerical monitoring methods for mass and semi-mature aged concrete

Author : Eduardo M.R. Fairbairn
Publisher : Springer
Page : 432 pages
File Size : 13,97 MB
Release : 2018-05-23
Category : Technology & Engineering
ISBN : 3319766171

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This book provides a State of the Art Report (STAR) produced by RILEM Technical Committee 254-CMS ‘Thermal Cracking of Mas-sive Concrete Structures’. Several recent developments related to the old problem of understanding/predicting stresses originated from the evolution of the hydration of concrete are at the origin of the creation this technical committee. Having identified a lack in the organization of up-to-date scientific and technological knowledge about cracking induced by hydration heat effects, this STAR aims to provide both practitioners and scientists with a deep integrated overview of consolidated knowledge, together with recent developments on this subject.

Author : Adrian M. Lawrence
Publisher :
Page : pages
File Size : 31,68 MB
Release : 2009
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ISBN :

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In each mix, one block was insulated on all six sides to simulate a fully adiabatic process, while the other block was insulated on five of the faces with the top face left open and exposed to environmental conditions. Measurements of the temperature and strain at predetermined locations within the blocks were recorded until the equilibrium temperature was achieved. Using the developed model, a parametric analysis was performed to evaluate the effects of cement heat generation, concrete thermal properties, dimension of concrete structure, insulation of structure, convection of heat, etc. on the temperature distribution and induced stresses in mass concrete structures. Recommendations on methods for evaluating the potential performance of mass concrete structures are presented.

Author : Ermakova A.V.
Publisher : Издательство АСВ
Page : 114 pages
File Size : 44,14 MB
Release : 2012
Category : Technology & Engineering
ISBN : 5930938792

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The work presents the theoretical basis of Additional Finite Element Method (AFEM), which is a variant of the Finite Element Method (FEM) for analysis of reinforced concrete structures at limit state. AFEM adds to the traditional sequence of problem by FEM the units of the two well-known methods of the structural design: method of additional loads and limit state method. The problem is solved by introduction of ideal failure models and additional design diagrams formed from additional finite elements, where each AFE describes the limit state reached by the main element. The main relations defining the properties of AFEs as well as the examples of the use of Additional Finite Element Method for analysis of reinforced concrete structures at limit state are given in the work too.

Author : Guenter Axel Rombach
Publisher : Thomas Telford
Page : 302 pages
File Size : 28,42 MB
Release : 2004
Category : Architecture
ISBN : 9780727732743

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In Finite Element Design of Concrete Structures: practical problems and their solutions the author addresses this blind belief in computer results by offering a useful critique that important details are overlooked due to the flood of information from the output of computer calculations. Indeed, errors in the numerical model may lead in extreme cases to structural failures as the collapse of the so-called Sleipner platform has demonstrated.

Author : Stephen B. Tatro
Publisher :
Page : 0 pages
File Size : 38,19 MB
Release : 2000
Category : Concrete
ISBN :

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This report presents examples of mass concrete thermal studies for several U.S. Army Corps of Engineers projects. The examples are preceded by a brief explanation of the components of each study and other relevant information. The example thermal studies were generally performed as outlined in ETL 1110-2-542, Thermal Studies of Mass Concrete Structures. This ETL is no longer in print, but the major elements of the document are now contained in EM 1110-2-2000, Standard Practice for Concrete for Civil Works Structures. This report serves as a companion document to the EM. More detailed explanation of the general provisions for performing mass concrete thermal studies are contained in the EM 1110-2-2000. The performance of thermal analyses can be grouped by level of complexity. This report provides explanations and examples of Levels 1 and 2 thermal studies. The most complex, Level 3, is not illustrated in this report. The procedure for a Level 1 analysis is presented along with an example of the thermal study for Cache Creek Detention Basin. The procedure for a Level 2 analysis is also presented. The preliminary thermal analysis for the American River Dam provides an example of a one-dimensional Level 2 thermal analysis, including an example using simple finite element (FE), one-dimensional strip models.

Author : R. Springenschmid
Publisher : CRC Press
Page : 491 pages
File Size : 32,95 MB
Release : 1994-10-13
Category : Architecture
ISBN : 148227129X

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Restraint and intrinsic stresses in concrete at early ages are vitally important for concrete structures which must remain free of water-permeable cracks, such as water-retaining structures, tunnel linings, locks and dams. The development of hydration heat, stiffness and strength, also the degree of restraint and, especially for high-strength concr