Dynamic Finite Element Analysis Of A Flexible Pavement System With Geosynthetic Reinforcement
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Dynamic Finite Element Analysis Of A Flexible Pavement System With Geosynthetic Reinforcement
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Author : Bassam Saad
language : en
Publisher:
Release Date : 2003
Dynamic Finite Element Analysis Of A Flexible Pavement System With Geosynthetic Reinforcement written by Bassam Saad and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Finite Element Modeling Of Geosynthetic Reinforced Pavement Subgrades
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Author : Abdelaziz Ahmed Bohagr
language : en
Publisher:
Release Date : 2013
Finite Element Modeling Of Geosynthetic Reinforced Pavement Subgrades written by Abdelaziz Ahmed Bohagr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Mechanistic Empirical Modeling And Design Model Development Of Geosynthetic Reinforced Flexible Pavements
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Author : Steven W. Perkins
language : en
Publisher:
Release Date : 2001
Mechanistic Empirical Modeling And Design Model Development Of Geosynthetic Reinforced Flexible Pavements written by Steven W. Perkins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Geogrids categories.
This report provides an appendix for the report with the reference: Perkins, S.W. (2001) Mechanistic Empirical Modeling and Design Model Development of Geosynthetic Reinforced Flexible Pavements: Final Report, Montana Department of Transportation, Helena, Montana, FHWA/MT 01 002/99160 1A, 156p. This report contains output from the software program DARWin for each design example provided in Appendix B of the above referenced report.
Geosynthetics In Civil And Environmental Engineering
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Author : Guang-xin Li
language : en
Publisher: Springer Science & Business Media
Release Date : 2009-03-07
Geosynthetics In Civil And Environmental Engineering written by Guang-xin Li and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-03-07 with Technology & Engineering categories.
Geosynthetics in Civil and Environmental Engineering presents contributions from the 4th Asian Regional Conference on Geosynthetics held in Shanghai, China. The book covers a broad range of topics, such as: fundamental principles and properties of geosynthetics, testing and standards, reinforcement, soil improvement and ground improvement, filter and drainage, landfill engineering, geosystem, transport, geosynthetics-pile support system and geocell, hydraulic application, and ecological techniques. Special case studies as well as selected government-sponsored projects such as the Three Gorges Dam, Qinghai-Tibet Railway, and Changi Land reclamation project are also discussed. The book will be an invaluable reference in this field.
Numerical Modeling Of Geosynthetic Reinforced Flexible Pavements
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Author : Steven W. Perkins
language : en
Publisher:
Release Date : 2001
Numerical Modeling Of Geosynthetic Reinforced Flexible Pavements written by Steven W. Perkins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with Geogrids categories.
Experimental studies conducted over the course of the past 20 years have demonstrated both general and specific benefits of using geosynthetics as reinforcement materials in flexible pavements. Existing design solutions are largely empirically based and appear to be unable to account for many of the variables that influence the benefit derived from the reinforcement. Advanced numerical modeling techniques present an opportunity for providing insight into the mechanics of these systems and can assist with the formulation of simplified numerical methods that incorporate essential features needed to predict the behavior of these systems. Previous experimental work involving the construction of geosynthetic reinforced test sections has shown several difficulties and uncertainties associated with the definition of reinforcement benefit for a single cycle of load application. Even though many reinforcement mechanisms are apparent and often times striking during the application of the first load cycle, the distinction between reinforced test sections is not nearly so clear as that which is seen when examining long term performance, where long term performance is defined in terms of permanent surface deformation after many load cycles have been applied. This indicates the need for an advanced numerical model that is capable of describing the repeated load behavior of reinforced pavements. In particular, models for the various pavement layers are needed to allow for a description of the accumulation of permanent strain under repeated loads. To meet these needs, a finite element model of unreinforced and geosynthetic reinforced pavements was created. The material model for the asphalt concrete layer consisted of an elastic perfectly plastic model where material property direction dependency could be added. This model allowed for the asphalt concrete layer to deform with the underlying base aggregate and subgrade layers as repeated pavement loads were applied. A bounding surface plasticity model was used for the base aggregate and subgrade layers. The model is well suited for the prediction of accumulated permanent strains under repeated loading and is most suitable for fine grained materials. A material model containing components of elasticity, plasticity, creep and direction dependency was formulated for the geosynthetic and calibrated against a series of in air tension tests. A Coulomb friction model was used to describe shear interaction between the base aggregate and the geosynthetic. The model is essentially an elastic-perfectly plastic model, allowing for specification of the shear interface stiffness and ultimate strength. This model was calibrated from a series of pull out tests. Finite element models were created to match the conditions in pavement test sections reported by Perkins (1999a). Membrane elements were used for the geosynthetic and a contact interface was used between the geosynthetic and the base course aggregate. Models of unreinforced and reinforced pavement sections were created and compared to test section resuts.
Evaluation Of Geosynthetic Reinforced Flexible Pavement Systems Using Two Pavement Test Facilities
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Author : Steven W. Perkins
language : en
Publisher:
Release Date : 2002
Evaluation Of Geosynthetic Reinforced Flexible Pavement Systems Using Two Pavement Test Facilities written by Steven W. Perkins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Geosynthetics categories.
Montana State University has previously completed experimental test section, numerical modeling and design model development projects for the Montana Department of Transportation. Test section work has led to a fundamental understanding of mechanisms by which geosynthetics provide reinforcement when placed in the aggregate layer of flexible pavements. Finite element numerical models have relied upon this knowledge as their basis while design models derived from these numerical models have been calibrated against results from test sections. The test sections used for the development of these models were limited by the number of subgrade types, geosynthetic types and loading type employed. This project was initiated to provide additional test section data to better define the influence of traffic loading type and geosynthetic reinforcement type. The loading provided to the test sections forming the basis of the models described above consisted of a cyclic load applied to a stationary plate. In this project, four full scale test sections were constructed and loaded with a heavy vehicle simulator located at the U.S. Army Corps of Engineers facility in Hanover, NH. The four test sections used three geosynthetics identical to those used in previous test sections and pavement layer materials and thickness similar to previous sections. Additional test sections were constructed in the pavement test box used in previous studies to examine the influence of base aggregate type, base course thickness reduction levels and reinforcement type. A rounded pit run aggregate was used in test sections to evaluate the influence of geosynthetic aggregate shear interaction parameters on reinforcement benefit. The 1993 AASHTO Design Guide was used to backcalculate the base course thickness reduction from previous test section results where a traffic benefit ratio (extension of life) was known. Sections were built to this base course thickness reduction to see if equivalent life to an unreinforced section was obtained. Finally, six different geosynthetic products were used in test sections to evaluate the influence of reinforcement type on pavement performance.
Flexible Pavement Analysis By The Three Dimentsional Finite Element Method
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Author : John B. Palmerton
language : en
Publisher:
Release Date : 1973
Flexible Pavement Analysis By The Three Dimentsional Finite Element Method written by John B. Palmerton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1973 with Finite element method categories.
Flexible Pavement Condition Evaluation Using Deflection Basin Parameters And Dynamic Finite Element Analysis Implemented By Artificial Neural Networks
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Author : Ranjithan, SR.
language : en
Publisher:
Release Date : 2000
Flexible Pavement Condition Evaluation Using Deflection Basin Parameters And Dynamic Finite Element Analysis Implemented By Artificial Neural Networks written by Ranjithan, SR. and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Artificial neural network (ANN) categories.
This paper presents a methodology based on deflection basin parameters and artificial neural networks (ANNs) for processing dynamic falling weight deflectometer (FWD) measurements to estimate layer moduli and condition. Two-dimensional, dynamic, finite element analysis using the ABAQUS program was employed to develop the deflection information for this study. Unlike the majority of the existing backcalculation programs that iteratively adjust all the layer moduli to match the measured deflections, the proposed method first determines the subgrade modulus by means of two deflection basin parameters, Base Damage Index and Shape Factor F2, and then applies the estimated subgrade modulus and other parameters as input variables to a trained ANN to estimate the upper layers' moduli. Procedures in predicting layer moduli for both two- and three-layer pavement systems are presented. Field FWD measurements were analyzed both by this method and by the MODULUS program, the results of which assess the capability of the proposed method. Effects of discontinuities in the asphalt layer on the resulting FWD deflections were also studied using the finite element method. It was discovered that distresses in the asphalt layer may be detected using two deflection basin parameters, Shape Factor F2 and AREA.
Bearing Capacity Of Roads Railways And Airfields Two Volume Set
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Author : Erol Tutumluer
language : en
Publisher: CRC Press
Release Date : 2009-06-15
Bearing Capacity Of Roads Railways And Airfields Two Volume Set written by Erol Tutumluer and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009-06-15 with Technology & Engineering categories.
Bearing Capacity of Roads, Railways and Airfields focuses on issues pertaining to the bearing capacity of highway and airfield pavements and railroad track structures and provided a forum to promote efficient design, construction and maintenance of the transportation infrastructure. The collection of papers from the Eighth International Conference
A Study Of Geosynthetic Reinforced Flexible Pavement System
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Author : Ranjiv Gupta
language : en
Publisher:
Release Date : 2009
A Study Of Geosynthetic Reinforced Flexible Pavement System written by Ranjiv Gupta and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The use of geosynthetics as reinforcement for the base layer of flexible pavement systems has grown steadily over the past thirty years. In spite of the evidence that geosynthetic reinforcements can lead to improved pavement performance, the specific conditions or mechanisms that enable and govern the reinforcement are unclear, largely remaining unidentified and unmeasured. The appropriate selection of design parameters for geosynthetics is complicated by the difficulty in associating their relevant properties to the improved pavement performance. In addition, pavement structures deteriorate under the combined effects of traffic loading and environmental conditions, such as moisture changes. However, these factors have not been studied together in the evaluation of the overall performance of pavement systems. Consequently, this research focused on the assessment of the effect of geosynthetics on the pavement structural section's ability to support traffic loads and to resist environmental changes. Accordingly, the primary objectives of this research were: (i) to determine the governing mechanisms and relevant properties of geosynthetics that contribute to the enhanced performance of pavement systems; (ii) to develop appropriate analytical, laboratory and field methods that are capable of quantifying the above properties for geosynthetics; and (iii) to enable the prediction of pavement performance depending on the various types of geosynthetics used. To fulfill these three objectives, an evaluative, laboratory and field study was performed. The improved performance of pavements due to addition of geosynthetics was attributed to the ability of geosynthetics to laterally restrain the base course material, thereby providing a confinement effect to the pavement. A parameter to quantify the soil-geosynthetic interaction at low displacement magnitudes based on the solution of an analytical model for geosynthetics confined in pullout box was proposed. The pullout tests were then conducted on various geosynthetics to obtain the proposed parameter for various geosynthetics. The quantitative magnitude of the parameter value from the laboratory tests was compared with the qualitative performance observed in the field test sections. Overall, a good agreement was obtained between the laboratory and field results, thereby providing confidence in the ability of the proposed analytical model to predict the governing mechanism for geosynthetic reinforced pavements.