Extension Of Stress Based Finite Element Model Using Resilient Modulus Material Characterization To Develop A Theoretical Framework For Realistic Response Modeling Of Flexible Pavements On Cohesive Subgrades
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Extension Of Stress Based Finite Element Model Using Resilient Modulus Material Characterization To Develop A Theoretical Framework For Realistic Response Modeling Of Flexible Pavements On Cohesive Subgrades
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Author : Kadri Parris
language : en
Publisher:
Release Date : 2015
Extension Of Stress Based Finite Element Model Using Resilient Modulus Material Characterization To Develop A Theoretical Framework For Realistic Response Modeling Of Flexible Pavements On Cohesive Subgrades written by Kadri Parris and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Abstract: Pavement design methodologies have over the past decades seen philosophical evolutions and eventually practical implementation of new postulates. As more contributions are made by pavement researchers to the State-of-the-Art in pavement design, there exist a chasm between pavement engineers and state-of-the-art pavement research in terms of incorporation into pavement design guidelines. In developing countries such as Guyana in South America, as well as several departments of transportation, municipalities and townships in the United States, pavement engineers still use the American Association of State Highway and Transportation Officials (AASHTO) Pavement Design Guide (1993). This empirical pavement design guide and its previous iterations were based primarily on data that was collected and processed from the then American Association of State Highway Officials (AASHO) Road Test conducted between 1958 and 1960. The limitations with continued use of this method are obvious since the data was gathered under specific environmental conditions, a specific subgrade type, and with specific materials as well as specific pavement cross-sections. The continued use of this guide does not account for advances in material technology, different types and volumes of vehicular traffic, changing climatic conditions and also can be costly in expanding road networks. To solve this dilemma pavement researchers started working toward a more mechanistic approach for design and through the work of National Cooperative Highway Research Program (NCHRP), culminated in the publishing of the Mechanistic-Empirical Pavement Design Guide (MEPDG) in 2004. The finite element model used in the MEPDG is premised upon a displacement based theory. These theories are capable of making good predictions regarding global responses such as displacements and sometimes in-plane stresses but not the transverse stress distribution. To predict transverse stress distribution, stress based theories are more suitable for use in formulations. At The Ohio State University, Chyou (1989), Schoeppner (1991) and Butalia (1996) worked on different versions of the stress based model for composite laminates. This model was initially extended by Tu (2007) to good effect for analyzing the responses in pavement systems. In this research effort, this response model is being further extended to incorporate a material characterization model into the stiffness matrix for more accurate structural response predictions. The material characterization model (Kim 2004) allows the pavement designer to make predictions of Resilient Modulus, Mr, for cohesive subgrades without the need for conducting the test which can be both costly and complex. This approach renders a cost effective way of obtaining one of the most important parameters for employing a mechanistic approach which is also a major prohibition for many developing countries to move closer to the State-of-the-Art. This new synthesis allows for good predictions of global responses as well as transverse stress distribution which is critical for overcoming pavement layer debonding that can reduce pavement life significantly. Considering the results of the analysis compared to ABAQUS 3D Finite Element Models, this new synthesis forms the basis of a good pavement response model which can be used to further a more mechanistic approach for relatively small design agencies.
Bearing Capacity Of Roads Railways And Airfields
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Author : Andreas Loizos
language : en
Publisher: CRC Press
Release Date : 2017-07-20
Bearing Capacity Of Roads Railways And Airfields written by Andreas Loizos and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-20 with Technology & Engineering categories.
Bearing Capacity of Roads, Railways and Airfields includes the contributions to the 10th International Conference on the Bearing Capacity of Roads, Railways and Airfields (BCRRA 2017, 28-30 June 2017, Athens, Greece). The papers cover aspects related to materials, laboratory testing, design, construction, maintenance and management systems of transport infrastructure, and focus on roads, railways and airfields. Additional aspects that concern new materials and characterization, alternative rehabilitation techniques, technological advances as well as pavement and railway track substructure sustainability are included. The contributions discuss new concepts and innovative solutions, and are concentrated but not limited on the following topics: · Unbound aggregate materials and soil properties · Bound materials characteritics, mechanical properties and testing · Effect of traffic loading · In-situ measurements techniques and monitoring · Structural evaluation · Pavement serviceability condition · Rehabilitation and maintenance issues · Geophysical assessment · Stabilization and reinforcement · Performance modeling · Environmental challenges · Life cycle assessment and sustainability Bearing Capacity of Roads, Railways and Airfields is essential reading for academics and professionals involved or interested in transport infrastructure systems, in particular roads, railways and airfields.
Modeling And Design Of Flexible Pavements And Materials
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Author : Dallas N. Little
language : en
Publisher: Springer
Release Date : 2017-09-25
Modeling And Design Of Flexible Pavements And Materials written by Dallas N. Little and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-09-25 with Technology & Engineering categories.
This textbook lays out the state of the art for modeling of asphalt concrete as the major structural component of flexible pavements. The text adopts a pedagogy in which a scientific approach, based on materials science and continuum mechanics, predicts the performance of any configuration of flexible roadways subjected to cyclic loadings. The authors incorporate state-of the-art computational mechanics to predict the evolution of material properties, stresses and strains, and roadway deterioration. Designed specifically for both students and practitioners, the book presents fundamentally complex concepts in a clear and concise way that aids the roadway design community to assimilate the tools for designing sustainable roadways using both traditional and innovative technologies.
Paving Materials And Pavement Analysis
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Author : American Society of Civil Engineers
language : en
Publisher: Amer Society of Civil Engineers
Release Date : 2010
Paving Materials And Pavement Analysis written by American Society of Civil Engineers and has been published by Amer Society of Civil Engineers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Technology & Engineering categories.
Pavement Design And Paving Material Selection are important for efficient, cost effective, durable, and safe transportation infrastructure Paving Materials and Pavement Analysis contains 73 papers examining bound and unbound material characterization, modeling, and performance of highway and airfield pavements. The papers in this publication were presented during the GeoShanghal 2010 International Conference held in Shanghai, China, June 3-5, 2010.
Asphalt Pavements
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Author : Y. Richard Kim
language : en
Publisher: CRC Press
Release Date : 2014-11-06
Asphalt Pavements written by Y. Richard Kim and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-11-06 with Technology & Engineering categories.
Asphalt Pavements contains the proceedings of the International Conference on Asphalt Pavements (Raleigh, North Carolina, USA, 1-5 June 2014), and discusses recent advances in theory and practice in asphalt materials and pavements. The contributions cover a wide range of topics:- Environmental protection and socio-economic impacts- Additives and mo
Theory Of Viscoelasticity
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Author : R. M. Christensen
language : en
Publisher: Courier Corporation
Release Date : 2013-04-26
Theory Of Viscoelasticity written by R. M. Christensen and has been published by Courier Corporation this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-04-26 with Technology & Engineering categories.
Integration of theoretical developments offers complete description of linear theory of viscoelastic behavior of materials, with theoretical formulations derived from continuum mechanics viewpoint and discussions of problem solving. 1982 edition.
Pavement Design And Materials
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Author : A. T. Papagiannakis
language : en
Publisher: John Wiley & Sons
Release Date : 2017-02-22
Pavement Design And Materials written by A. T. Papagiannakis and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-02-22 with Technology & Engineering categories.
A comprehensive, state-of-the-art guide to pavement design and materials With innovations ranging from the advent of SuperpaveTM, the data generated by the Long Term Pavement Performance (LTPP) project, to the recent release of the Mechanistic-Empirical pavement design guide developed under NCHRP Study 1-37A, the field of pavement engineering is experiencing significant development. Pavement Design and Materials is a practical reference for both students and practicing engineers that explores all the aspects of pavement engineering, including materials, analysis, design, evaluation, and economic analysis. Historically, numerous techniques have been applied by a multitude of jurisdictions dealing with roadway pavements. This book focuses on the best-established, currently applicable techniques available. Pavement Design and Materials offers complete coverage of: The characterization of traffic input The characterization of pavement bases/subgrades and aggregates Asphalt binder and asphalt concrete characterization Portland cement and concrete characterization Analysis of flexible and rigid pavements Pavement evaluation Environmental effects on pavements The design of flexible and rigid pavements Pavement rehabilitation Economic analysis of alternative pavement designs The coverage is accompanied by suggestions for software for implementing various analytical techniques described in these chapters. These tools are easily accessible through the book’s companion Web site, which is constantly updated to ensure that the reader finds the most up-to-date software available.
Soil Testing Soil Stability And Ground Improvement
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Author : Wissem Frikha
language : en
Publisher: Springer
Release Date : 2017-07-11
Soil Testing Soil Stability And Ground Improvement written by Wissem Frikha and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-07-11 with Science categories.
Earthwork projects are critical components in civil construction and often require detailed management techniques and unique solution methods to address failures. Being earth bound, earthwork is influenced by geomaterial properties at the onset of a project. Hence, an understanding of the in-situ soil properties is essential. Slope stability is a common problem facing earthwork construction, such as excavations and shored structures. Analytical methods for slope stability remain critical for researchers due to the mechanical complexity of the system. Striving for better earthwork project managements, the geotechnical engineering community continues to find improved testing techniques for determining sensitive properties of soil and rock, including stress-wave based, non-destructive testing methods. To minimize failure during earthwork construction, past case studies and data may reveal useful lessons and information to improve project management and minimize economic losses. This volume is part of the proceedings of the 1st GeoMEast International Congress and Exhibition on Sustainable Civil Infrastructures, Egypt 2017.
Soil Mechanics For Unsaturated Soils
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Author : Delwyn G. Fredlund
language : en
Publisher: John Wiley & Sons
Release Date : 1993-09-06
Soil Mechanics For Unsaturated Soils written by Delwyn G. Fredlund and has been published by John Wiley & Sons this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-09-06 with Technology & Engineering categories.
The principles and concepts for unsaturated soils are developed as extensions of saturated soils. Addresses problems where soils have a matric suction or where pore-water pressure is negative. Covers theory, measurement and use of the fundamental properties of unsaturated soils--permeability, shear strength and volume change. Includes a significant amount of case studies.
Development And Validation Of Performance Prediction Models And Specifications For Asphalt Binders And Paving Mixes
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Author : Robert L. Lytton
language : en
Publisher: Strategic Highway Research Program (Shrp)
Release Date : 1993
Development And Validation Of Performance Prediction Models And Specifications For Asphalt Binders And Paving Mixes written by Robert L. Lytton and has been published by Strategic Highway Research Program (Shrp) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Asphalt concrete categories.
A result of the Strategic Highway Research Program's asphalt research is the development of performance-based specifications for asphalt binders and mixtures to control 3 distress modes: rutting; fatigue cracking; and thermal cracking. The SHRP A-005 project developed detailed pavement performance models to support these binder and mixture specifications and performance-based mixture designs. This report documents the findings of this extensive research effort and provides supporting data for the performance-based specifications and mixture design procedure called SUPERPAVE. The A-005 contract developed and used a sophisticated, mechanistic-based pavement performance model to define the relationships between asphalt binder and mixture properties and pavement distress. A comprehensive pavement performance model was developed that predicts the amount of fatigue cracking, thermal cracking and rutting in asphalt concrete pavements with time, using results from the accelerated laboratory tests. The pavement performance models for each distress were also used to confirm the relevant binder and mixture properties established by other SHRP contractors. The model has 3 parts: a mixture evaluation model; a pavement response model; and a pavement distress model.