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.
Private Note:
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Author: Gregory L. Morris, Jiahua Fan | Size: 79.4 MB | Format:PDF | Quality:Original preprint | Publisher: Mc Graw Hill | Year: 2010 | pages: 805
Design and Management of Dams, Reservoirs and Watersheds for sustainable use.
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IS269 (1989): ORDINARY PORTLAND CEMENT ,33 GRADE SPECIFICATION
IS 383 (1970) : SPECIFICATION FOR COARSE AND FINE AGGREGATES FROM NATURAL SOURCES FOR CONCRETE
IS455 (1989) PORTLAND SLAG CEMENT-SPECIFICATION
IS456(2000): plain cement and reinforced concrete
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Seismic design with supplemental energy dissipation devices
Author: Robert D Hanson/t t soong | Size: 14 MB | Format:PDF | Quality:Scanner | Publisher: EERI (Earthquake Engineering Research Institute) | Year: 2001 | pages: 135 | ISBN: 0943198135/978-0943198132
Seismic Design with Supplemental Energy Dissipation Devices imparts basic concepts of the supplemental energy dissipation technology to design engineers, architects, and building officials so they can understand its benefits and limitations in structural applications. The approach is introductory. References are cited throughout the monograph for readers who wish to study the subject in more depth. Supplemental energy dissipation systems are recent innovations to improve earthquake building performance. Research has led to a better understanding of the effects of supplemental energy dissipation on the earthquake response of buildings. Over the last 20 years, significant progress has been made in developing manufactured systems. They are being reliably designed and installed in new as well as existing buildings. Development of design codes and standards for energy dissipation systems has progressed slowly. This monograph summarizes information on their use in designing new earthquake-resistant buildings and upgrading the seismic performance of existing buildings. The following areas are covered:
* The physical consequences of adding energy dissipation systems to a structure for various types of input motion
* Summary of generic energy dissipation device characteristics
* Summary of pros and cons of specific device characteristics in meeting selected design objectives
* Seismic design limits for selecting energy dissipation systems
* Design approaches for the limits of elastic or inelastic response
About the Author
ROBERT D. HANSON received his undergraduate and master's degrees in Civil Engineering (structural engineering) from the California Institute of Technology. He is professor emeritus in the Civil Engineering Department at the University of Michigan. He was chairman of the department from 1976 to 1984. His primary research areas have been concerned with inelastic response of steel and reinforced concrete buildings, earthquake-resistant design, repair and retrofitting of buildings, pseudodynamic testing, and supplemental damping techniques. Hanson is a past president of the Earthquake Engineering Research Institute. For many years he served as the USA Technical Coordinator for the US/Japan Large-Scale Earthquake Research program for the Reinforced Concrete and Structural Steel phases. He has been a member of the NAE/NRC Committee on Earthquake Engineering, the Technical Management Committee of the Building Seismic Safety Council, the American Society of Civil Engineers, and the American Concrete Institute. He was elected to the National Academy of Engineering in 1984.
TSU T. SOONG, P.E. is Samuel P. Capen Professor of Engineering Science at the State University of New York at Buffalo, where he has been on the faculty since 1963. He earned M.S. and Ph.D. degrees in engineering sciences from Purdue University. His present teaching and research interests are large-scale systems in civil engineering, structural control and identification, reliability and safety of engineering systems, and earthquake engineering. He has served on professional committees of ATC, ASCE, and BSSC, has published extensively, has been associate editor of numerous journals, and has been co-coordinator of the NSF Research Initiative on Structural Control. He was recipient of ASCE Norman and Newmark medals in 1999 and 2002, respectively.
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