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Author: Jason Donald Ross Publisher: ISBN: Category : Languages : en Pages :
Book Description
Abstract: Traditional rebar reinforcement methods in concrete columns have been accepted for many years as the common practice among designers and contractors. There has been a tremendous amount of research completed and designers are capable of predicting the future performance of the columns. More recently, retrofit methods have been used on aging concrete columns. This includes adding an additional layer of concrete or composite material around the existing column to slow the deterioration and to increase the concrete confinement. Current models exist in the use of a combination of a rebar cage and concrete as the retrofit method. Fiber-reinforced polymer (FRP) wraps are fast becoming a new form of technology to replace traditional rebar retrofit technology. The fiber-reinforced polymer wraps are a composite material that can be attached to the existing concrete column using an epoxy resin. The wrap increases the concrete confinement of the column and provides support for the concrete dilation in the column. However, FRP wraps are not heavily used in structural applications because there is not an accepted model that has been proven to accurately predict future strength characteristics of the confined concrete column. The focus of this research project is to use the results of an already completed test of concrete columns confined by FRP wraps, and compare the resulting stress-strain curves to the commonly proposed modeling technology available. FRP modeling is still relatively new and there is not a widely accepted model. The purpose of this research project is to determine how accurately the proposed FRP models predict the strength of the tested columns. There are many different models that have been proposed, but the key to the future of FRP retrofitting is to create a widely accepted, reliable model that engineers can use in design. It is important to normalize the design process of FRP retrofitted columns in order to better use the technology in the future.
Author: Jason Donald Ross Publisher: ISBN: Category : Languages : en Pages :
Book Description
Abstract: Traditional rebar reinforcement methods in concrete columns have been accepted for many years as the common practice among designers and contractors. There has been a tremendous amount of research completed and designers are capable of predicting the future performance of the columns. More recently, retrofit methods have been used on aging concrete columns. This includes adding an additional layer of concrete or composite material around the existing column to slow the deterioration and to increase the concrete confinement. Current models exist in the use of a combination of a rebar cage and concrete as the retrofit method. Fiber-reinforced polymer (FRP) wraps are fast becoming a new form of technology to replace traditional rebar retrofit technology. The fiber-reinforced polymer wraps are a composite material that can be attached to the existing concrete column using an epoxy resin. The wrap increases the concrete confinement of the column and provides support for the concrete dilation in the column. However, FRP wraps are not heavily used in structural applications because there is not an accepted model that has been proven to accurately predict future strength characteristics of the confined concrete column. The focus of this research project is to use the results of an already completed test of concrete columns confined by FRP wraps, and compare the resulting stress-strain curves to the commonly proposed modeling technology available. FRP modeling is still relatively new and there is not a widely accepted model. The purpose of this research project is to determine how accurately the proposed FRP models predict the strength of the tested columns. There are many different models that have been proposed, but the key to the future of FRP retrofitting is to create a widely accepted, reliable model that engineers can use in design. It is important to normalize the design process of FRP retrofitted columns in order to better use the technology in the future.
Author: Jiping Bai Publisher: Woodhead Publishing ISBN: 0128203471 Category : Technology & Engineering Languages : en Pages : 844
Book Description
Advanced Fibre-reinforced Polymer (FRP) Composites for Structural Applications, Second Edition provides updates on new research that has been carried out on the use of FRP composites for structural applications. These include the further development of advanced FRP composites materials that achieve lighter and stronger FRP composites, how to enhance FRP integrated behavior through matrix modification, along with information on pretension treatments and intelligence technology. The development of new technology such as automated manufacturing and processing of fiber-reinforced polymer (FRP) composites have played a significant role in optimizing fabrication processing and matrix formation. In this new edition, all chapters have been brought fully up-to-date to take on the key aspects mentioned above. The book's chapters cover all areas relevant to advanced FRP composites, from the material itself, its manufacturing, properties, testing and applications in structural and civil engineering. Applications span from civil engineering, to buildings and the energy industry. Covers all areas relevant to advanced FRP composites, from the material itself, its manufacturing, properties, testing and applications in structural engineering Features new manufacturing techniques, such as automated fiber placement and 3D printing of composites Includes various applications, such as prestressed-FRP, FRP made of short fibers, continuous structural health monitoring using advanced optical fiber Bragg grating (FBG), durability of FRP-strengthened structures, and the application of carbon nano-tubes or platelets for enhancing durability of FRP-bonded structures
Author: Omkar Tipnis Publisher: ISBN: Category : Languages : en Pages :
Book Description
This thesis is intended at studying and comparing empirical models that have been proposed for the modeling of the stress-strain response of a FRP confined concrete subjected to axial load. An attempt has been made to model the experimental set up for the compression test of a concrete cylinder confined with FRP sheet in AbaqusCAE. The results so obtained have been compared and analyzed against the experimental test results & the results obtained from a chosen mathematical model (Modified Lam & Teng). An attempt was made to create a new material model in Opensees that follows the chosen mathematical model. However, this was not achieved due to the reasons that will be explained in the later sections.Reinforced concrete confined with steel is typically designed by considering the Manders model (Mander et al., 1988), which assumes a constant confining pressure. This is true with the case of steel as it is a ductile material and one assumes the steel to be yielded. However with the case of FRP jackets, this is not true. FRP is a linear elastic and brittle material and does not yield, which makes the Manders model inaccurate for its analysis. Many models have been proposed which take into account the increasing confining pressure due to the FRP wrap. A comparative study of the constitutive models proposed for FRP confined reinforced concrete has been done in this study.Finally after a series of numerical interpretations of different specimens and their comparison with the experimental data, the utility and accuracy of the new modified Lam & Teng's model was validated. The validation process included comparison and analytical data obtained via finite element simulation in Abaqus, empirical model results and the experimental data.The objective is achieved and restricted within the following scope of study:1)Literature review to identify and choose the most relevant models for modeling of concrete confined with fiber reinforced polymers in compression.2)Modelling and finite element analysis of the confined concrete compression test in AbaqusCAE.3)Developing the stress-strain curve from several proposed empirical model (Modified Lam & Teng).4)Survey of experimental data on confined concrete with FRP in order to generate an experimental database.5)Comparison of the analytical results in order to define the strengths and limitations of the empirical model chosen to study.6)Validation of the model chosen and a study on its relevance for use in typical bridge columns retrofitted with FRP jackets.7)Proposing changes to the empirical model for more accurate results.8)Validate the effects of the proposed changes.
Author: Yufei Wu Publisher: Woodhead Publishing ISBN: 0128232013 Category : Architecture Languages : en Pages : 556
Book Description
Analytical Approaches for Reinforced Concrete presents mathematically-derived theories and equations for RC design and construction. The book applies deductive reasoning, logic and mathematics to RC. Laying out, deductively, the principles of RC, it encourages researchers to re-imagine and innovate using a solid conceptual framework. Sections consider the reasoning behind key theories, as well as problems that remain unsolved. The title presents key ideas in simple language and illustrates them clearly to help the reader grasp difficult concepts and develop a solid foundation, grounded in mathematics, for further study and research. The book is future-oriented, demonstrating theories that are applicable not only to conventional reinforced concrete members, but also to the envisaged structures of tomorrow. Such developments will increasingly require a deep, deductive understanding of RC. This title is the first of its kind, presenting a fresh analytical approach to reinforced concrete design and construction. Takes an analytical approach to reinforced concrete using mathematics and deduction Lays out the reasoning behind key theories and models in reinforced concrete design and construction Encourages researchers-new and established- to re-imagine and innovate using a solid conceptual framework Presents difficult concepts that are clearly and analytically presented with accompanying illustrations Looks forward to the use of reinforced concrete in the complex structures of the future
Author: Graham A. Long Publisher: ISBN: Category : Languages : en Pages : 89
Book Description
The use of fiber reinforced polymers for the retrofit of existing structures is a common practice in blast protection. The tools used to assess the behavior of structures have become more refined allowing for precise modeling of reinforced members retrofitted with fiber reinforced polymers (FRP). However, many of these tools require extensive computational power that is often time consuming. This study aims to adapt an existing expedient dynamic analysis assessment tool in order to account for the behavior of reinforced concrete members retrofitted with FRP for flexural enhancement. FRP retrofits have been shown to increase the capacity of the members under severe loading conditions. However, the strength associated with the FRP layer is not always able to fully develop due to the debonding behavior between the two surfaces. The model will seek to capture this behavior by employing fracture mechanics along the bonded interface. The results of the modeling tool will be validated by comparing them to those of finite element analysis programs as well as available experimental test data. An additional parametric study will be conducted to evaluate the models ability to capture the bond behavior when adjusting the properties associated with the FRP.
Author: Hyonny Kim Publisher: DEStech Publications, Inc ISBN: 1605951242 Category : Science Languages : en Pages : 3583
Book Description
New and not previously published U.S. and international research on composite and nanocomposite materialsFocus on health monitoring/diagnosis, multifunctionality, self-healing, crashworthiness, integrated computational materials engineering (ICME), and moreApplications to aircraft, armor, bridges, ships, and civil structures This fully searchable CD-ROM contains 270 original research papers on all phases of composite materials, presented by specialists from universities, NASA and private corporations such as Boeing. The document is divided into the following sections: Aviation Safety and Aircraft Structures; Armor and Protection; Multifunctional Composites; Effects of Defects; Out of Autoclave Processing; Sustainable Processing; Design and Manufacturing; Stability and Postbuckling; Crashworthiness; Impact and Dynamic Response; Natural, Biobased and Green; Integrated Computational Materials Engineering (ICME); Structural Optimization; Uncertainty Quantification; NDE and SHM Monitoring; Progressive Damage Modeling; Molecular Modeling; Marine Composites; Simulation Tools; Interlaminar Properties; Civil Structures; Textiles. The CD-ROM displays figures and illustrations in articles in full color along with a title screen and main menu screen. Each user can link to all papers from the Table of Contents and Author Index and also link to papers and front matter by using the global bookmarks which allow navigation of the entire CD-ROM from every article. Search features on the CD-ROM can be by full text including all key words, article title, author name, and session title. The CD-ROM has Autorun feature for Windows 2000 or higher products and can also be used with Macintosh computers. The CD includes the program for Adobe Acrobat Reader with Search 11.0. One year of technical support is included with your purchase of this product.
Author: Alper Ilki Publisher: Springer Nature ISBN: 3030881660 Category : Technology & Engineering Languages : en Pages : 2516
Book Description
This volume highlights the latest advances, innovations, and applications in the field of FRP composites and structures, as presented by leading international researchers and engineers at the 10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), held in Istanbul, Turkey on December 8-10, 2021. It covers a diverse range of topics such as All FRP structures; Bond and interfacial stresses; Concrete-filled FRP tubular members; Concrete structures reinforced or pre-stressed with FRP; Confinement; Design issues/guidelines; Durability and long-term performance; Fire, impact and blast loading; FRP as internal reinforcement; Hybrid structures of FRP and other materials; Materials and products; Seismic retrofit of structures; Strengthening of concrete, steel, masonry and timber structures; and Testing. The contributions, which were selected by means of a rigorous international peer-review process, present a wealth of exciting ideas that will open novel research directions and foster multidisciplinary collaboration among different specialists.
Author: Christian Bucher Publisher: CRC Press ISBN: 0203876539 Category : Mathematics Languages : en Pages : 248
Book Description
Proper treatment of structural behavior under severe loading - such as the performance of a high-rise building during an earthquake - relies heavily on the use of probability-based analysis and decision-making tools. Proper application of these tools is significantly enhanced by a thorough understanding of the underlying theoretical and computation
Author: Alper Ilki Publisher: Springer Science & Business Media ISBN: 9048126819 Category : Technology & Engineering Languages : en Pages : 500
Book Description
Many more people are coming to live in earthquake-prone areas, especially urban ones. Many such areas contain low-rise, low-cost housing, while little money is available to retrofit the buildings to avoid total collapse and thus potentially save lives. The lack of money, especially in developing countries, is exacerbated by difficulties with administration, implementation and public awareness. The future of modern earthquake engineering will come to be dominated by new kinds of measuring technologies, new materials developed especially for low-rise, low-cost buildings, simpler and thus lower cost options for retrofitting, cost cutting and raising public awareness. The book covers all the areas involved in this complex issue, from the prevention of total building collapse, through improvement techniques, to legal, financial, taxation and social issues. The contributors have all made valuable contributions in their own particular fields; all of them are or have been closely involved with the issues that can arise in seismic zones in any country. The recent research results published here offer invaluable pointers to practicing engineers and administrators, as well as other scientists whose work involves saving the lives and property of the many millions of people who live and work in hazardous buildings.
Author: L C Hollaway Publisher: Woodhead Publishing ISBN: 9781855737365 Category : Science Languages : en Pages : 788
Book Description
Following the success of ACIC 2002, this is the 2nd International Conference focusing on the application and further exploitation of advanced composites in construction held at the University of Surrey in April 2004. With over 100 delegates the conference brought together practicing engineers, asset managers, researchers and representatives of regulatory bodies to promote the active exchange of scientific and technical information on the rapidly changing scene of advanced composites in construction. The aim of the conference was to encourage the presentation of new concepts, techniques and case studies, which will lead to greater exploitation of advanced polymer composites and FRP materials for the civil engineering infrastructure, rehabilitation and renewal.
Author: Jason Donald Ross
Author: Jason Donald Ross
Author: Jiping Bai
Author: Omkar Tipnis
Author: Yufei Wu
Author: Graham A. Long
Author: Hyonny Kim
Author: Alper Ilki
Author: Christian Bucher
Author: Alper Ilki
Author: L C Hollaway