Download or read book Computer Analysis of Falling weight Deflectometer Data written by Allen H. Magnuson and published by . This book was released on 1988 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt: A computer algorithm SCALPOT, consisting of a set of programs and linked files, has been developed that computes responses for physical and geometrical conditions simulating the Dynatest Falling-Weight Deflectometer. Related work on dynamic analysis of layered elastic and viscoelastic media is reviewed. The pavement dynamics problem as measured by the FWD is shown to be a near-field or intermediate-field problem requiring different integration techniques than far-feld problems arising in seismic work. Integration of the formal solution is shown to be best treated by direct numerical integration using a newly developed method of estimating truncation error.

Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by Shiraz D. Tayabji and published by ASTM International. This book was released on 2000 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt: As with the previous two symposia, the 32 papers from the June/July, 1999, Seattle symposium present advances in the nondestructive testing of pavements using conventional falling weight deflectometer techniques and other promising techniques such as ground penetrating radar, rolling weight deflecto

Download or read book Dynamic Analysis of Falling Weight Deflectometer Data written by Boutros E. Sebaaly and published by . This book was released on 1986 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Dynamic Analysis of Falling weight Deflectometer Data written by Allen H. Magnuson and published by . This book was released on 1988 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Falling-Weight Deflectometer data from three in-service pavement sections has been used to analyze dynamic response characteristics. The Analyzed data will be used later in the project along with computer predictions of pavement response to back-calculate engineering properties of pavements. The pavements had thicknesses of 1.5 in., 9 in., and 12 in., and two load levels were tested. The full pulse data is presented for the dropweight force and all seven surface displacement sensors. The analysis was performed in the frequency domain using frequency response functions computed from the pulse data. The frequency response functions were computed by dividing the Fast Fourier Transform (FFT) of the displacements by the FFI of the force. Magnitude and phase angles of the frequency response functions are presented. An undesirable oscillation was present in the frequency response functions. This was attributed to a discontinuity in the displacement pulses resulting from zero-packing in the FFT Program. The pulses have a non-zero "tail" value at the end of the 60 msec sample period which causes the discontinuity. The pulse "tail" may be due to drift, permanent deformation of the pavement, or premature truncation before the transient response had died out. A linear correction to the pulses that eliminated the discontinuity was applied to one test case. This eliminated the undesirable oscillation, giving the responses a more regular behavior similar to predicted theoretical responses. This correction should facilitate comparison studies of computed versus measured FWD responses.

Download or read book Development of Dynamic Analysis Techniques for Falling weight Deflectometer Data written by Allen H. Magnuson and published by . This book was released on 1997 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bearing Capacity Of Roads Volume 1 written by A. Gomes Correia and published by CRC Press. This book was released on 2022-01-27 with total page 800 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is an outcome of the sixth conference on bearing capacity of roads and airfield held in Lisbon, Portugal. It focuses on railway tracks and covers following topics: bearing capacity policies, concepts, costs and condition surveys; analysis and modelling; design and environmental effects.

Download or read book FWD DYN a Computer Program for Forward Analysis and Inversion of Falling Weight Deflection Data written by Rafael Foinquinos and published by . This book was released on 1993 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by ASTM Committee D-18 on Soil and Rock. Subcommittee D-4 on Road and Paving Materials and published by ASTM International. This book was released on 1994 with total page 528 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of June 1993 international symposium held in Atlanta, Georgia, called specifically to develop and standardized evaluation procedures for non-destructive methods of testing pavements. The 29 papers discuss analytical models and techniques, measurement and calculation techniques in the field and laboratory, problems and errors associated with backcalculation methods and design parameters, and testing for other pavement uses. Also includes a history of the quest for a standard and the status of that effort. Reproduced from typescripts. Annotation copyright by Book News, Inc., Portland, OR

Download or read book Intelligent and Soft Computing in Infrastructure Systems Engineering written by Kasthurirangan Gopalakrishnan and published by Springer. This book was released on 2009-11-23 with total page 330 pages. Available in PDF, EPUB and Kindle. Book excerpt: The term “soft computing” applies to variants of and combinations under the four broad categories of evolutionary computing, neural networks, fuzzy logic, and Bayesian statistics. Although each one has its separate strengths, the complem- tary nature of these techniques when used in combination (hybrid) makes them a powerful alternative for solving complex problems where conventional mat- matical methods fail. The use of intelligent and soft computing techniques in the field of geo- chanical and pavement engineering has steadily increased over the past decade owing to their ability to admit approximate reasoning, imprecision, uncertainty and partial truth. Since real-life infrastructure engineering decisions are made in ambiguous environments that require human expertise, the application of soft computing techniques has been an attractive option in pavement and geomecha- cal modeling. The objective of this carefully edited book is to highlight key recent advances made in the application of soft computing techniques in pavement and geo- chanical systems. Soft computing techniques discussed in this book include, but are not limited to: neural networks, evolutionary computing, swarm intelligence, probabilistic modeling, kernel machines, knowledge discovery and data mining, neuro-fuzzy systems and hybrid approaches. Highlighted application areas include infrastructure materials modeling, pavement analysis and design, rapid interpre- tion of nondestructive testing results, porous asphalt concrete distress modeling, model parameter identification, pavement engineering inversion problems, s- grade soils characterization, and backcalculation of pavement layer thickness and moduli.

Download or read book Falling Weight Deflectometer Usage written by Sirous H. Alavi and published by Transportation Research Board National Research. This book was released on 2008 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: At head of title: National Cooperative Highway Research Program.

Download or read book Nondestructive Testing of Pavements and Backcalculation of Moduli written by Albert Jasper Bush and published by ASTM International. This book was released on 1989 with total page 701 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Texas State Publications written by Texas State Publications Clearinghouse and published by . This book was released on 1989 with total page 908 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Backcalculation of Pavement Moduli 1991 written by National Research Council (U.S.). Transportation Research Board and published by Transportation Research Board National Research. This book was released on 1991 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Texas State Documents written by Texas State Publications Clearinghouse and published by . This book was released on 1989 with total page 910 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book HRIS Abstracts written by and published by . This book was released on 1990 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Analyses Relating to Pavement Material Characterizations and Their Effects on Pavement Performance written by and published by . This book was released on 1998 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the analysis conducted on relating pavement performance or response measures and design considerations to specific pavement layers utilizing data contained in the Long-Term Pavement Performance Program National Information Management System. The goal of this research activity was to enhance implementation and use of the 1993 AASHTO Design Guide through improved materials characterizations. Specifically, the focus of this research activity was to identify the differences that exist between laboratory measured and backcalculated resilient moduli; determine the applicability of the C values, drainage coefficients, and relative damage factors that are included in the Design Guide; and provide procedures to adequately consider the seasonal variation of material properties as related to flexible pavement designs. Based on these results, design pamphlets have been prepared in support of the AASHTO Design Guide. These design pamphlets are documented and included in other reports. The results reported here form the basis and background for those design pamphlets.

Download or read book Texas State Publications Index written by and published by . This book was released on 1989-07 with total page 644 pages. Available in PDF, EPUB and Kindle. Book excerpt: