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Theoretical Compressive Stress Strain Behavior For High Strength Concrete Confined In Opposing Spirals
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Book Synopsis Theoretical Compressive Stress-strain Behavior for High Strength Concrete Confined in Opposing Spirals by : Jonathan C. West
Download or read book Theoretical Compressive Stress-strain Behavior for High Strength Concrete Confined in Opposing Spirals written by Jonathan C. West and published by . This book was released on 2010 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bridge Maintenance, Safety, Management and Life-Cycle Optimization by : Dan Frangopol
Download or read book Bridge Maintenance, Safety, Management and Life-Cycle Optimization written by Dan Frangopol and published by CRC Press. This book was released on 2010-07-07 with total page 744 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bridge Maintenance, Safety, Management and Life-Cycle Optimization contains the lectures and papers presented at IABMAS 2010, the Fifth International Conference of the International Association for Bridge Maintenance and Safety (IABMAS), held in Philadelphia, Pennsylvania, USA from July 11 through 15, 2010.All major aspects of bridge maintenance, s
Book Synopsis Lateral Strain Modeling, Analysis and Design of Confined Concrete by : Chunxiao Dong
Download or read book Lateral Strain Modeling, Analysis and Design of Confined Concrete written by Chunxiao Dong and published by . This book was released on 2017-01-26 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation, "Lateral Strain Modeling, Analysis and Design of Confined Concrete" by Chunxiao, Dong, 董春宵, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: This thesis presents a lateral strain model of confined concrete, which makes no assumptions on the properties of confining materials and is therefore generally applicable regardless of the type of confinement. It can be applied to concrete members or columns confined by fiber reinforced polymer (FRP), steel tubes or steel tubes wrapped with FRP or steel rings/spirals, provided the appropriate stress-strain models of the confining materials are incorporated in the analysis. The lateral strain model can also be used to directly evaluate the lateral strain of confined concrete with non-cylindrical section or under eccentric loading where the lateral strain and confining stress could vary across the section using finite element analysis. The first part of the thesis presents the details of the derivations of the lateral strain model of confined concrete. A total of 95 actively confined concrete specimens and 34 passively confined concrete specimens covering a wide range of concrete strength from 25 to 120 MPa and confining stress from 0 to 0.99 times the concrete strength tested by other researchers in the published literature have been investigated for the influence of concrete strength, confining stress and axial strain on the lateral strain of confined concrete. Based on the regression analysis, the influence of concrete strength, confining stress and axial strain is accurately and consistently captured and a constitutive model for predicting the lateral strain of confined concrete under different levels of confinement from pre-crack and elastic state to post-crack and inelastic state is proposed. In the second part of the thesis, theoretical models integrating the proposed lateral strain model, axial stress-strain model of confined concrete, stress-strain model of steel tube, FRP, steel rings/spirals have been proposed to analyze the axial stress-strain curves of a total of 174 FRP confined concrete, 138 concrete-filled steel tubes (CFST) without external confinement, 89 CFST with FRP jackets and 98 CFST with external steel rings/spirals. The lateral strain, confining stress can be obtained by an iterative procedure and the axial stress/load can be evaluated by substituting the so obtained confining stress into the axial stress-strain model of confined concrete. It is observed that the theoretical models can predict the axial and lateral stress-strain behaviour of FRP confined concrete, CFST, and CFST with external confinement accurately and consistently. Finally, a parametric study has been carried out by varying a series of structural parameters such as concrete strength, steel tube yield strength and thickness-to-diameter ratios, FRP confining stiffness and rupture strain, and steel rings/spirals confining stiffness to study the effects on strength and ductility. From the data generated by the parametric study, design formulas for predicting the yield and ultimate strength of FRP confined concrete, CFST with or without external confinements are proposed and compared with existing codes and design charts for evaluating the minimum FRP confining stiffness or steel rings/spirals thickness-to-diameter ratio to achieve different levels of ductility for CFST with various concrete strength are presented. Moreover, the minimum confining stiffness of external confinement to avoid delamination is evaluated for design guidance. Subjects: Reinforced concrete
Book Synopsis Stress-strain Behavior of Plain and Fibrous High Strength Concrete Under Compression by : Lin Showmay Hsu
Download or read book Stress-strain Behavior of Plain and Fibrous High Strength Concrete Under Compression written by Lin Showmay Hsu and published by . This book was released on 1992 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of High-Strength Concrete Columns by :
Download or read book Behavior of High-Strength Concrete Columns written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The use of high-strength concrete for bridges and high-rise buildings become popular due to development in concrete technology and availability of various types of mineral and chemical admixtures. High-strength concrete could lead to smaller member sizes for compression members and therefore provide considerable savings associated with material costs and reduction of dead loads. However, Most of the current design codes, such as AASHTO-LRFD Bridge Specifications, are still based on tests conducted using normal-strength concrete. Many studies indicate that the behavior of columns with high-strength concrete is different from that of normal-strength concrete. The experimental phase of this investigation consists of thirty two rectangular and twenty four circular columns subjected to concentric and eccentric loading conditions to investigate the behavior of high-strength concrete columns. The main variables considered in this study were concrete strength ranging from 7.9 to 16.5 ksi, shape of cross section, and longitudinal and transverse reinforcement ratios. Using the test results of this study and other researches in literature, the dissertation provides design equation to predict the capacity of high-strength concrete columns with tie and spiral reinforcements subjected to concentric and eccentric loading conditions up to 18 ksi. The research also proposes a new stress-strain relationship of high-strength concrete confined with spiral reinforcements.
Book Synopsis Stress-strain Behavior of High-strength Concrete Rectilinearly Confined and Subjected to Short-term Monotonic Concentric Loading by : Malakah Gamal Nour
Download or read book Stress-strain Behavior of High-strength Concrete Rectilinearly Confined and Subjected to Short-term Monotonic Concentric Loading written by Malakah Gamal Nour and published by . This book was released on 1987 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Axial Compressive Behavior of Actively Confined and FRP-confined Concretes by : Jian Chin Lim
Download or read book Axial Compressive Behavior of Actively Confined and FRP-confined Concretes written by Jian Chin Lim and published by . This book was released on 2015 with total page 602 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the 1920s, a significant research effort has been dedicated to the understanding of the improved compressive behavior of concrete under lateral confinement. Upon the introduction of fiber-reinforced polymer (FRP) composites to the construction industry, the use of FRP as confinement material has received much attention. To that end, a great number of studies have been conducted in the past two decades on the axial compressive behavior of unconfined, actively confined and FRP-confined concretes, resulting in the development of over 110 stress-strain models. These models are classified into four broad categories, namely design-oriented, analysis-oriented, evolutionary algorithm, and finite element models. In the present study, existing models in each category were carefully reviewed and assessed using comprehensive experimental test databases assembled through an extensive review of the literature. The databases cover more than 7000 test results of unconfined, actively confined, and FRP-confined concrete specimens from 500 studies. A close examination of the assessment results has led to a number of important findings on factors influencing the performances of existing models. For each model category possible areas for further improvement were identified and new models were proposed. First, an empirical model in simple closed-form expressions that are suitable for engineering design purpose was developed using the database of FRP-confined concrete. The distinct feature of this design-oriented model includes its applicability to normal- and high-strength concretes with cross-sections ranging from circular to rectangular. The model also considers the observed dependency of the hoop rupture stain of the confining jacket on the material properties of the concrete and FRP. In addition, a novel concept, referred to as the confinement stiffness threshold condition, was incorporated into this model to allow for an accurate prediction of post-peak strain softening behavior of FRP-confined concrete. Following this, using the combined database, a unified analysis-oriented model that is capable of predicting the complete stress-strain and dilation behaviors of unconfined, actively confined, and FRP-confined concretes was developed. It was found that, at a given axial strain, lateral strains of actively confined and FRP-confined concretes of the same concrete strength correspond when they are subjected to the same lateral confining pressure. However, under the same condition, concrete confined by FRP exhibits a lower strength enhancement compared to that seen in companion actively confined concrete. On the basis of this observation, a novel approach that incorporates the confining pressure gradient between the two confinement systems was established and a unified stress-strain model was developed. Other distinct features of this highly versatile model are its applicability to concretes ranging from light- to normal-weight and low- to high-strength. In addition, it is also applicable to specimens with various sizes and slenderness. To improve the capability of handling complex databases with a large number of independent variables, a third category of model that uses evolutionary algorithm and soft computing techniques was considered. In this study, a genetic programming approach that is capable of gradually refining the solution while maintaining the versatility of the model in closed-form expressions was used to develop an evolutionary algorithm model for FRP-confined concrete. Lastly, the finite element modeling approach was investigated. A review of the existing literature revealed that the failure criterion and flow rule considered by existing FE models for confined concretes are based on limited test results and they are not very sensitive to the variations in unconfined concrete strength and confining pressure. Based on the comprehensive experimental databases assembled, a concrete strength-sensitive finite element model applicable to concrete subjected to various confining pressure levels was developed. Comparison with experimental test results show that the predictions of all of the proposed models are in good agreement with the test results, and the models provide improved accuracy compared to the existing models. Comparison of models in different categories indicates that model accuracy generally improves with the size of database and the complexity of modeling framework; however, the choice of models depends mainly on the suitability of their end use.
Book Synopsis The Failure of Plain and Spirally Reinforced Concrete in Compression by : Frank Erwin Richart
Download or read book The Failure of Plain and Spirally Reinforced Concrete in Compression written by Frank Erwin Richart and published by . This book was released on 1929 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Basic Principles of Concrete Structures by : Xianglin Gu
Download or read book Basic Principles of Concrete Structures written by Xianglin Gu and published by Springer. This book was released on 2015-12-09 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on the latest version of designing codes both for buildings and bridges (GB50010-2010 and JTG D62-2004), this book starts from steel and concrete materials, whose properties are very important to the mechanical behavior of concrete structural members. Step by step, analysis of reinforced and prestressed concrete members under basic loading types (tension, compression, flexure, shearing and torsion) and environmental actions are introduced. The characteristic of the book that distinguishes it from other textbooks on concrete structures is that more emphasis has been laid on the basic theories of reinforced concrete and the application of the basic theories in design of new structures and analysis of existing structures. Examples and problems in each chapter are carefully designed to cover every important knowledge point. As a basic course for undergraduates majoring in civil engineering, this course is different from either the previously learnt mechanics courses or the design courses to be learnt. Compared with mechanics courses, the basic theories of reinforced concrete structures cannot be solely derived by theoretical analysis. And compared with design courses, this course emphasizes the introduction of basic theories rather than simply being a translation of design specifications. The book will focus on both the theoretical derivations and the engineering practices.
Book Synopsis ACI 440. 2R-17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures by : ACI Committee 440
Download or read book ACI 440. 2R-17 Guide for the Design and Construction of Externally Bonded FRP Systems for Strengthening Concrete Structures written by ACI Committee 440 and published by . This book was released on 2017-04-27 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal of Engineering Mechanics by :
Download or read book Journal of Engineering Mechanics written by and published by . This book was released on 2002 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Unified Theory of Concrete Structures by : Thomas T. C. Hsu
Download or read book Unified Theory of Concrete Structures written by Thomas T. C. Hsu and published by John Wiley & Sons. This book was released on 2010-03-16 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unified Theory of Concrete Structures develops an integrated theory that encompasses the various stress states experienced by both RC & PC structures under the various loading conditions of bending, axial load, shear and torsion. Upon synthesis, the new rational theories replace the many empirical formulas currently in use for shear, torsion and membrane stress. The unified theory is divided into six model components: a) the struts-and-ties model, b) the equilibrium (plasticity) truss model, c) the Bernoulli compatibility truss model, d) the Mohr compatibility truss model, e) the softened truss model, and f) the softened membrane model. Hsu presents the six models as rational tools for the solution of the four basic types of stress, focusing on the significance of their intrinsic consistencies and their inter-relationships. Because of its inherent rationality, this unified theory of reinforced concrete can serve as the basis for the formulation of a universal and international design code. Includes an appendix and accompanying website hosting the authors’ finite element program SCS along with instructions and examples Offers comprehensive coverage of content ranging from fundamentals of flexure, shear and torsion all the way to non-linear finite element analysis and design of wall-type structures under earthquake loading. Authored by world-leading experts on torsion and shear
Book Synopsis Principles of Reinforced Concrete by : Zhenhai Guo
Download or read book Principles of Reinforced Concrete written by Zhenhai Guo and published by Butterworth-Heinemann. This book was released on 2014-07-17 with total page 607 pages. Available in PDF, EPUB and Kindle. Book excerpt: Principle of Reinforced Concrete introduces the main properties of structural concrete and its mechanical behavior under various conditions as well as all aspects of the combined function of reinforcement and concrete. Based on the experimental investigation, the variation regularity of mechanical behavior, working mechanism, and calculation method are presented for the structural member under various internal forces. After examining the basic principle and analysis method of reinforced concrete, the book covers some extreme circumstances, including fatigue load, earthquake, explosion, high temperature (fire accident), and durability damage, and the special responses and analysis methods of its member under these conditions. This work is valuable as a textbook for post-graduates, and can be used as a reference for university teachers and under-graduates in the structural engineering field. It is also useful for structural engineers engaged in scientific research, design, or construction. Focuses on the principles of reinforced concrete, providing professional and academic readers with a single volume reference Experimental data enables readers to make full use of the theory presented The mechanical behavior of both concrete and reinforcement materials, plus the combined function of both are covered, enabling readers to understand the behaviors of reinforced concrete structures and their members Covers behavior of the materials and members under normal and extreme conditions
Author :fib Fédération internationale du béton Publisher :fib Fédération internationale du béton ISBN 13 :9782883940543 Total Pages :178 pages Book Rating :4.9/5 (45 download)
Book Synopsis Externally Bonded FRP Reinforcement for RC Structures by : fib Fédération internationale du béton
Download or read book Externally Bonded FRP Reinforcement for RC Structures written by fib Fédération internationale du béton and published by fib Fédération internationale du béton. This book was released on 2001-01-01 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt: In December 1996, the then CEB established a Task Group with the main objective to elaborate design guidelines for the use of FRP reinforcement in accordance with the design format of the CEB-FIP Model Code and Eurocode2. With the merger of CEB and FIP into fib in 1998, this Task Group became fib TG 9.3 FRP Reinforcement for concrete structures in Commission 9 Reinforcing and Prestressing Materials and Systems. The Task Group consists of about 60 members, representing most European universities, research institutes and industrial companies working in the field of advanced composite reinforcement for concrete structures, as well as corresponding members from Canada, Japan and USA. Meetings are held twice a year and on the research level its work is supported by the EU TMR (European Union Training and Mobility of Researchers) Network "ConFibreCrete”. The work of fib TG 9.3 is performed by five working parties (WP): Material Testing and Characterization (MT&C) Reinforced Concrete (RC) Prestressed Concrete (PC) Externally Bonded Reinforcement (EBR) Marketing and Applications (M&A) This technical report constitutes the work conducted as of to date by the EBR party. This bulletin gives detailed design guidelines on the use of FRP EBR, the practical execution and the quality control, based on the current expertise and state-of-the-art knowledge of the task group members. It is regarded as a progress report since it is not the aim of this report to cover all aspects of RC strengthening with composites. Instead, it focuses on those aspects that form the majority of the design problems. several of the topics presented are subject of ongoing research and development, and the details of some modelling approaches may be subject to future revisions. as knowledge in this field is advancing rapidly, the work of the EBR WP will continue. Inspite of this limit in scope, considerable effort has been made to present a bulletin that is today’s state-of-art in the area of strengthening of concrete structures by means of externally bonded FRP reinforcement.
Book Synopsis Fracture mechanics of concrete: Structural application and numerical calculation by : George C. Sih
Download or read book Fracture mechanics of concrete: Structural application and numerical calculation written by George C. Sih and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concrete has traditionally been known as a material used widely in the construction of roads, bridges and buildings. Since cost effectiveness has always been one of the more important aspects of design, concrete, when reinforced and/or prestressed, is finding more use in other areas of application such as floating marine structures, storage tanks, nuclear vessel containments and a host of other structures. Because of the demand for concrete to operate under different loading and environmen tal conditions, increasing attention has been paid to study concrete specimens and structure behavior. A subject of major concern is how the localized segregation of the constituents in concrete would affect its global behavior. The degree of nonhomogeneity due to material property and damage. by yielding and/or cracking depends on the size scale and loading rate under consideration. Segregation or clustering of aggregates at the macroscopic level will affect specimen behavior to a larger degree than it would to a large structure such as a dam. Hence, a knowledge of concrete behavior over a wide range of scale is desired. The parameters governing micro-and macro-cracking and the techniques for evaluating and observing the damage in concrete need to be better understood. This volume is intended to be an attempt in this direction. The application of Linear Elastic Fracture Mechanics to concrete is discussed in several of the chapters.
Book Synopsis FRP Composites for Reinforced and Prestressed Concrete Structures by : Perumalsamy Balaguru
Download or read book FRP Composites for Reinforced and Prestressed Concrete Structures written by Perumalsamy Balaguru and published by CRC Press. This book was released on 2008-11-05 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt: High strength fibre composites (FRPs) have been used with civil structures since the 1980s, mostly in the repair, strengthening and retrofitting of concrete structures. This has attracted considerable research, and the industry has expanded exponentially in the last decade. Design guidelines have been developed by professional organizations in a nu
Book Synopsis Constitutive Equations for Engineering Materials by : Wai-Fah Chen
Download or read book Constitutive Equations for Engineering Materials written by Wai-Fah Chen and published by Elsevier. This book was released on 2013-10-22 with total page 595 pages. Available in PDF, EPUB and Kindle. Book excerpt: Constitutive Equations for Engineering Materials, Volume 1: Elasticity and Modeling, Revised Edition focuses on theories on elasticity and plasticity of engineering materials. The book first discusses vectors and tensors. Coordinate systems, vector algebra, scalar products, vector products, transformation of coordinates, indicial notation and summation convention, and triple products are then discussed. The text also ponders on analysis of stress and strain and presents numerical analysis. The book then discusses elastic stress-strain relations. Basic assumptions; need for elastic models; isotropic linear stress-strain relations; principle of virtual work; strain energy and complementary energy density in elastic solids; and incremental relations grounded on secant moduli are described. The text also explains linear elasticity and failure criteria for concrete and non-linear elasticity and hypoelastic models for concrete. The selection further tackles soil elasticity and failure criteria. Mechanical behavior of soils; failure criteria of soils; and incremental stress-strain models based on modification of the isotropic linear elastic formulation are considered. The text is a good source of data for readers interested in studying the elasticity and plasticity of engineering materials.
