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BEHAVIOUR ANALYSIS AND DESIGN OF STRUCTURAL STEEL ELEMENTS_VOL-1_DR. EL SAYED BAHHA MACHALY
Author: DR. EL SAYED BAHHA MACHALY | Size: 27 MB | Format:PDF | Quality:Unspecified | Publisher: - | Year: 2001 | pages: 576 | ISBN: ISBN : 977- 223-549-8
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Author: Eigelaar, Estee M. | Size: 17 MB | Format:PDF | Quality:Original preprint | Publisher: University of Stellenbosch | Year: 2010-03
ENGLISH SUMMARY: It is found that the serviceability limit state often governs the design of slender reinforced concrete members. Slender flexural members often have a percentage tension reinforcement less than 1.0% and an applied bending moment just above the point of first cracking. For such members, the available methods to evaluate the serviceability conditions produce inadequate and unrealistic results. The evaluation of the serviceability of a slender member includes the calculation of the predicted deflection, either by empirical hand-calculation or analysing a finite element model, and the verification using the span-to-effective-depth ratio. The focus of the study is on flat slab structures. It investigates the different deflection prediction methods and the span-to-effective-depth ratio verifications from various design standards. These design standards include the ACI 318 (2002), the SABS 0100-1 (2000), the EC2 (2004) and the BS 8110 (1997). The background to the methods, as well as the parameters which influences the deflection development for lightly reinforced members, are investigated in order to define the limitations of the methods. As a result of the investigation of the deflection calculation methods, an Alternative Approach is suggested and included in the comparisons of the various methods. The deflection prediction methods and the span/effective depth verification procedures are accurately formulated to predict the serviceability behaviour of beams. Additional approaches had to be used to apply these methods to a two-dimensional plane such as that of a flat slab structure. The different deflection prediction methods and the span/effective depth verification methods are calculated and compared to the recorded data of seven experimental flat slab specimens as performed by others. A study by Gilbert and Guo (2005) accurately recorded the flexural behaviour of flat slab specimens under uniformly distributed loads for test periods up to 750 days. The methods to evaluate the serviceability of a slender member were also applied to slab examples designed using South African standards. The study concludes by suggesting a suitable deflection prediction method for different parameter (limitation) categories with which a slender member can comply to. The typical span/effective depth ratio trend is also presented as the percentage tension reinforcement for a slender member changes. It is observed that the empirical hand-calculation methods present more reliable results than those of the finite element models. The empirical hand-calculation methods are accurate depending on the precision to which the slab was constructed relative to the actual slab design. The comparison of the deflection methods with South African case studies identified the role played by construction procedures, material parameters and loading history on slab behaviour.
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An Evaluation of the Prediction of Flat Slab Deflections
Authors: Wium, Jan A; Eigelaar, Estee M.
Source: IABSE Symposium Report, IABSE Symposium, Venice 2010 , pp. 30-37(8)
Publisher: International Association for Bridge and Structural Engineering
Abstract:
The deflection calculation of slender, lightly reinforced, concrete members is investigated. It is observed that the different available calculation methods produce different deflection results. The reasons for the irregular results are investigated. The various deflection prediction methods include empirical hand calculation methods as presented in SABS 0100-1, the Eurocode2, and the ACI 318. Comparisons are also made with the finite element method using a commercial software package. It is shown that deflection calculations do not consider construction and post construction conditions, often resulting in non durable and non sustainable structures.
Keywords: deflections; calculation method; flat slab; reinforced concrete; slender members
Document Type: Research article
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Author: Ardeshir Guran, Andrei L. Smirnov, David J. Steigmann | Size: 11.6 MB | Format:PDF | Quality:Original preprint | Publisher: World Scientific Pub Co Inc | Year: August 10, 2006 | pages: 282 | ISBN: 9812568670, ISBN-13: 978-9812568670
The contributions in this volume are written by well-known specialists in the fields of mechanics, materials modeling and analysis. They comprehensively address the core issues and present the latest developments in these and related areas. In particular, the book demonstrates the breadth of current research activity in continuum mechanics. A variety of theoretical, computational, and experimental approaches are reported, covering finite elasticity, vibration and stability, and mechanical modeling. The coverage reflects the extent and impact of the research pursued by Professor Haseganu and her international colleagues.
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Experimental Verification of Viscous Damping Modeling for Inelastic Time History Analyzes
Author: Lorenza Petrini, Claudio Maggi, M. J. Nigel Priestley & G. Michele Calvi | Size: 2 MB | Format:PDF | Quality:Unspecified | Publisher: Taylor and Francis | Year: 2008 | pages: 22
Inelastic time history analyzes (ITHA) are recognized as the most suitable tool for describing the behavior of structures under seismic actions. It is clear that the reliability of ITHA results is strongly dependent on the modeling choices. One of the aspects still debated, in spite of a large amount of research, is the modeling of viscous damping forces. In the case of a single degree of freedom (SDOF) structure, the damping not represented by hysteretic response is commonly assumed proportional to the square root of the system stiffness: typically in the research papers it is not declared whether the initial or tangent-stiffness is considered. Recent research has shown that initial or tangent-stiffness proportional damping can give very different results in terms of energy dissipation, and peak response displacement. In this work, experimental and numerical tests performed to detect the most appropriate model are described and discussed.
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I am looking for the following book and missing chapters.
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structural identification and damage detection using generic algorithms
Author: Chan Ghee Koh and Michael John Perry | Size: 71.9 MB | Format:PDF | Quality:Scanner | Publisher: CRC | Year: 2010 | pages: 152 | ISBN: ISSN 1747-77 5/ISBN hardbook 13-978-0-415-46102-3/ISBN 13 978-0-203-85943-8 (eBook)
Welcome to the Book Series Structures and Infrastructures.
Our knowledge to model, analyze, design, maintain, manage and predict the lifecycle performance of structures and infrastructures is continually growing. However, the complexity of these systems continues to increase and an integrated approach is necessary to understand the effect of technological, environmental, economical, social and political interactions on the life-cycle performance of engineering structures and infrastructures. In order to accomplish this, methods have to be developed to systematically analyze structure and infrastructure systems, and models have to be formulated for evaluating and comparing the risks and benefits associated with various alternatives. We must maximize the life-cycle benefits of these systems to serve the needs of our society by selecting the best balance of the safety, economy and sustainability requirements despite imperfect information and knowledge. In recognition of the need for such methods and models, the aim of this Book Series is to present research, developments, and applications written by experts on the most advanced technologies for analyzing, predicting and optimizing the performance of structures and infrastructures such as buildings, bridges, dams, underground construction, offshore platforms, pipelines, naval vessels, ocean structures, nuclear power plants, and also airplanes, aerospace and automotive structures.
The scope of this Book Series covers the entire spectrum of structures and infrastructures. Thus it includes, but is not restricted to, mathematical modeling, computer and experimental methods, practical applications in the areas of assessment and evaluation, construction and design for durability, decision making, deterioration modeling and aging, failure analysis, field testing, structural health monitoring, financial planning, inspection and diagnostics, life-cycle analysis and prediction, loads, maintenance strategies, management systems, nondestructive testing, optimization of maintenance and management, specifications and codes, structural safety and reliability, system analysis, time-dependent performance, rehabilitation, repair, replacement, reliability and risk management, service life prediction, strengthening and whole life costing.
This Book Series is intended for an audience of researchers, practitioners, and students world-wide with a background in civil, aerospace, mechanical, marine and automotive engineering, as well as people working in infrastructure maintenance, monitoring, management and cost analysis of structures and infrastructures. Some volumes are monographs defining the current state of the art and/or practice in the field, and some are textbooks to be used in undergraduate (mostly seniors), graduate and postgraduate courses. This Book Series is affiliated to Structure and Infrastructure Engineering.an international peer-reviewed journal which is included in the Science Citation Index.
It is now up to you, authors, editors, and readers, to make Structures and Infrastructures a success.
Dan M. Frangopol
Book Series Editor
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