In a large number of concrete structures and structural elements multiaxial compressive stress states occur. As is generally known, these stress states in general have an advantageous effect on the behaviour of the material, compared to the behaviour under uniaxial loading: the load bearing capacity increases and larger deformations are allowable. Unfortunately, this effect has not yet been implemented in the building codes, because there are too many unknowns to describe it in a useful quantitative manner. Therefore insight in the behaviour of concrete under this type of loading is important with respect to safety and deformational capacity of several kinds of concrete structures. At Eindhoven University of Technology (EUT) a research project was started in the early eighties to gain more insight in the failure behaviour of concrete in multiaxial compression. The research described in this thesis is to be regarded as a continuation of the work done earlier at EUT. It deals with several aspects of concrete behaviour in multiaxial compression that were not investigated before or from a different point of view, and intends to answer some remaining questions on the subject.
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Modeling Error of Strength of Short Reinforced Concrete Columns
Author: W. Zhou and H. P. Hong | Size: 1 MB | Format:PDF | Quality:Original preprint | Publisher: ACI | Year: 2000 | pages: 9
Abstract:
Probabilistic analyses of the modeling errors of several selected strength prediction models for short reinforced concrete (RC) columns are carried out. The selected strength models include the rectangular stress block model and the stress-strain relation-based theoretical model. A relatively large amount of test data on RC columns is collected from the literature, and the test results are com-pared with the predicted ones obtained from different strength mod-els. Both normal- and high-strength concrete columns are included in this study. The dependency of the modeling errors on concrete compressive strength and the load eccentricity is investigated. Probabilistic analyses of the modeling errors are carried out by using the pseudolikelihood estimation method. Sets of probabilistic models of the modeling errors by considering different analysis approaches are suggested for short RC columns.
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Behavior and Ductility of Reinforced Concrete Short Columns using Global Truss Model
Author: Marina L. Moretti and Theodosios P. Tassios | Size: 1 MB | Format:PDF | Quality:Original preprint | Publisher: ACI | Year: 2006 | pages: 9
Abstract:
The main results of an experimental program on eight full-scale reinforced concrete short columns are presented. The specimens were subjected to compression and cyclic reversed uniaxial shear displacements. The parameters investigated were the value of shear ratio, the ratios of longitudinal and transverse reinforcement, and the normalized axial force ratio. Two different layouts of main reinforcement were tested: conventional (longitudinal) and a combination of longitudinal and bidiagonal reinforcement. Columns with shear ratio equal to 1 were shown to behave in a particularly brittle manner. The presence of bidiagonal reinforcement improved to some extent the ductility of the specimens, but not to the level required by current aseismic design. The relative performance of the specimens tested is evaluated according to various ductility criteria. A model for designing short columns is also presented.
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Behavior and Ductility of Reinforced Concrete Short Columns using Global Truss Model in Concrete Beams
Author: Marina L. Moretti and Theodosios P. Tassios | Size: ?? MB | Format:PDF | Quality:Unspecified | Publisher: Structural Journal, Volume: 103, Issue: 3 | Year: May 1, 2006 | pages: 319-327
Abstract:
The main results of an experimental program on eight full-scale reinforced concrete short columns are presented. The specimens were subjected to compression and cyclic reversed uniaxial shear displacements. The parameters investigated were the value of shear ratio, the ratios of longitudinal and transverse reinforcement, and the normalized axial force ratio. Two different layouts of main reinforcement were tested: conventional (longitudinal) and a combination of longitudinal and bidiagonal reinforcement. Columns with shear ratio equal to 1 were shown to behave in a particularly brittle manner. The presence of bidiagonal reinforcement improved to some extent the ductility of the specimens, but not to the level required by current aseismic design. The relative performance of the specimens tested is evaluated according to various ductility criteria. A model for designing short columns is also presented.
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Modeling Error of Strength of Short Reinforced Concrete Columns
Author: W. Zhou and H. P. Hong | Size: ?? MB | Format:PDF | Quality:Unspecified | Publisher: Structural Journal, Volume: 97, Issue: 3 | Year: May 1, 2000 | pages: 427-435
Abstract:
Probabilistic analyses of the modeling errors of several selected strength prediction models for short reinforced concrete (RC) columns are carried out. The selected strength models include the rectangular stress block model and the stress-strain relation-based theoretical model. A relatively large amount of test data on RC columns is collected from the literature, and the test results are com-pared with the predicted ones obtained from different strength mod-els. Both normal- and high-strength concrete columns are included in this study. The dependency of the modeling errors on concrete compressive strength and the load eccentricity is investigated. Probabilistic analyses of the modeling errors are carried out by using the pseudolikelihood estimation method. Sets of probabilistic models of the modeling errors by considering different analysis approaches are suggested for short RC columns.
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Micromechanics of Failure in Granular Geomaterials
Author: François Nicot, Richard Wan | Size: 33.5 MB | Format:PDF | Quality:Scanner | Publisher: Wiley-ISTE | Year: 2009 | pages: 377 | ISBN: 978-1-84821-128-5
This book is a treatise that brings together some of the latest international research and advances in the failure of granular geomaterials within a micromechanical approach. It provides a view of the current scientific community on this topic, putting forward relevant methods and efficient tools for analysis. The chapters include either phenomenological contributions enriched with micromechanical ingredients, or purely micromechanical investigations. Various failure modes that are encountered in geomaterials and their implications in engineering applications are discussed throughout the chapters. The case of porous frictional materials with or without a fluid phase is considered together with the basic roles of the sliding and opening of contacts as a failure mechanism. The influence of grain crushing as a plausible mechanism under a variety of stress conditions and grain topologies is also addressed. Finally, fracture in continuous materials containing grain inclusions is dealt within the context of damage theory.
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Tubular Steel Structures Theory and Design-2nd edition
Author: M. S. Troitsky (Author) | Size: 24.5 MB | Format:PDF | Quality:Scanner | Publisher: The James F. Lincoln Arc Welding Foundation | Year: 1990 | pages: 409
In this second edition the contents have been thoroughly revised and every effort was made to correct errors and misprints detected in the first edition. Although much of the data of the first edition has been retained, the following changes and additions were made in the contents of the second edition.
In Chapter 7 "Bins and Bunkers" sections retained to the Ring Girders and Roofs for Circular Bins, were substituted by the new text for Circular Girders Supporting Bins and Roofs for Circular Bins. Also in Chapter 12 "Tubular Conveyor Galleries" new sections concerning the design of "Ring Girders at Supports, Method by Krupka" were added.
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Can someone provide the FIB bulletin No.202:
"Reliability of Concrete Structures - Final Report of Permanent Commission I"?
1991; ISBN 978-2-88394-007-9; 172 pages
Creep Behavior and Its Prediction for Normal Strength Concrete Made from Crushed Clay Bricks as Coarse Aggregate
Author: Syed Ishtiaq Ahmad and Sushanta Roy | Size: ?? MB | Format:PDF | Quality:Unspecified | Publisher: Journal of Materials in Civil Engineering / Volume 24 / Issue 3 / TECHNICAL PAPERS | Year: 2012
To study the effect of crushed clay bricks as coarse aggregate on creep behavior of concrete, a comprehensive testing program was conducted. Concrete cylinder specimens having characteristic or specified compressive strength of 17.2, 24.0, and 27.5 MPa were prepared from both natural stone and crushed clay brick aggregate. Mix design ratios were evaluated in a way so that volumetric content of coarse aggregate, both brick and stone, remained same for all concrete samples. Specimens were subjected to creep testing at the 7th and 28th day after casting and creep strain data were recorded up to 300 days. Results show that although strength and other environmental parameters remain the same, concrete made from crushed clay brick as coarse aggregate have a higher creep strain than that of concrete made from natural stone aggregate. This increase in creep strain ranges from 30% to as high as 45% for the 300-day loading history considered. Additionally, to select an appropriate model to predict creep in brick aggregate concrete, the effectiveness of five widely used prediction models were examined. Predicted creep strain from ACI 209R, CEB-FIP, B3, GL2000, and Eurocode 2 models were compared with experimental results. By using statistical analysis, the authors established that prediction of creep by GL2000 model is closest to the experimental results. Finally, a modification factor has been proposed that may be incorporated so that prediction of creep strain by the GL2000 model in brick aggregate concrete becomes more realistic.
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