Download or read book Failure Criteria for Flexible Airfield Pavements written by Charles R. Foster and published by . This book was released on 1958 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probabilistic and Reliability Design Procedures for Flexible Airfield Pavements elastic Layered Method written by Yu T. Chou and published by . This book was released on 1987 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: A procedure was developed to analyze layered elastic flexible pavement systems in terms of probability and reliability. A computer program RELIBSIA was prepared to carry out the computations. Rosenblueth method, instead of the conventional Taylor series expansion, us used to estimate the expected value and variance of the strains (dependent parameters) based on the input mean values of independent parameters, i.e., aircraft load, layer thicknesses, and material moduli. The relationships between the reliability level and the allowable strain repetition of the designed system which is established with results computed using RELIBISA provide a decision-making tool for engineers to design pavements at desired reliability level. The design can be optimized by selecting thicknesses of the bituminous concrete and the base layers so that the pavement is failed in fatigue cracking and subgrade failure at nearly the same traffic level and the same reliability level. The reliability-strain curves have steeper slopes with the bituminous concrete strain failure criterion than with the subgrade strain failure criterion, indicating that for flexible pavements designed using the Corps of Engineer's failure criteria, the design has a greater degree of uncertainty in preventing subgrade failure than fatigue cracking of the bituminous concrete surface corps. However, this may not be true in real cases because the bituminous concrete failure criteria are determined based on controlled laboratory test data which do not consider the uncertainties existing in the laboratory-to-field correlations.
Download or read book Engineering and Design written by and published by . This book was released on 1958 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Design Temperatures for Flexible Airfield Pavement Design written by A. F. Stock and published by . This book was released on 1989 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: The mechanistic approach to flexible pavement design recognises 2 forms of traffic induced structural damage, one being fatigue failure by cracking in the asphalt layer, the other being permanent deformation. The criterion used for ensuring that the pavement does not fail prematurely due to fatigue in the asphalt is based upon tensile strain. It has been shown that the tensile strain due to aircraft loading has a maximum value at the bottom of the asphalt layer, and it is at this depth that the strain is calculated. The position of the maximum strain relative to the aircraft wheels is dependent upon the aircraft gear configuration, the pavement thickness and stiffness, but is readily determined. Extensive laboratory fatigue tests, combined with full scale trials have permitted the development of a fatigue criterion based on a limiting strain value, so that pavements can be designed to give satisfactory performance. (sdw).
Download or read book The Behavior of Flexible Airfield Pavements Under Loads Theory and Experiments written by Yu Tang Chou and published by . This book was released on 1973 with total page 182 pages. Available in PDF, EPUB and Kindle. Book excerpt: The instrumentation data of the multiple-wheel heavy gear load (MWHGL) tests were reduced and analyzed. By incorporating the performance of test pavements under traffic, relations between load and pavement response were established. A method was developed to compute the measured stresses and deflections of the test pavements; based on the method, the stresses and deflections can be computed for similar types of airfield pavements under different loads. Correlations were established between computed parameters and traffic performance data from the MWHGL test section as well as from many other pavement tests conducted by the Corps of Engineers. Based on the instrumentation data, the principle of superposition was found to be valid for flexible pavements. Attempts were made to reevaluate the equivalent single-wheel loads for MWHGLs by many different methods. (Author).
Download or read book Flexible Pavement Design for Airfields written by and published by . This book was released on 1997 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Airfield Flexible Pavements Air Force written by and published by . This book was released on 1969 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Analytical Procedure for Flexible Airfield Pavement Rutting Incorporating Environmental Location and Groundwater Table Effects written by Ramadan A. Salim and published by . This book was released on 2011 with total page 245 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structural design of pavements in both highways and airfields becomes complex when one considers environmental effects and ground water table variation. Environmental effects have been incorporated on the new Mechanistic-Empirical Pavement Design Guide (MEPDG) but little has been done to incorporate environmental effects on airfield design. This work presents a developed code produced from this research study called ZAPRAM, which is a mechanistically based pavement model based upon Limiting Strain Criteria in airfield HMA pavement design procedures. ZAPRAM is capable of pavement and airfield design analyses considering environmental effects. The program has been coded in Visual Basic and implemented in an event-driven, user-friendly educational computer program, which runs in Excel environment. Several studies were conducted in order to insure the validity of the analysis as well as the efficiency of the software. The first study yielded the minimum threshold number of computational points the user should use at a specific depth within the pavement system. The second study was completed to verify the correction factor for the Odemark's transformed thickness equation. Default correction factors were included in the code base on a large comparative study between Odemark's and MLET. A third study was conducted to provide a comparison of flexible airfield pavement design thicknesses derived from three widely accepted design procedures used in practice today: the Asphalt Institute, Shell Oil, and the revised Corps of Engineering rutting failure criteria to calculate the thickness requirements necessary for a range of design input variables. The results of the comparative study showed that there is a significant difference between the pavement thicknesses obtained from the three design procedures, with the greatest deviation found between the Shell Oil approach and the other two criteria. Finally, a comprehensive sensitivity study of environmental site factors and the groundwater table depth upon flexible airfield pavement design and performance was completed. The study used the newly revised USACE failure criteria for subgrade shear deformation. The methodology utilized the same analytical methodology to achieve real time environmental effects upon unbound layer modulus, as that used in the new AASHTO MEPDG. The results of this effort showed, for the first time, the quantitative impact of the significant effects of the climatic conditions at the design site, coupled with the importance of the depth of the groundwater table, on the predicted design thicknesses. Significant cost savings appear to be quite reasonable by utilizing principles of unsaturated soil mechanics into the new airfield pavement design procedure found in program ZAPRAM.
Download or read book Engineering and Design written by United States. Army. Corps of Engineers and published by . This book was released on 1962 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Airfield Pavements challenges and New Technologies written by Moses Karakouzian and published by . This book was released on 2004 with total page 592 pages. Available in PDF, EPUB and Kindle. Book excerpt: This collection contains 35 papers presented at the 2003 Airfield Pavement Specialty Conference, held in Las Vegas, Nevada, September 21-24, 2003.
Download or read book Airfield pavements written by and published by . This book was released on 1973 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flexible Airfield Pavement Evaluation written by United States. Department of the Army and published by . This book was released on 1968 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Moisture Conditions Under Flexible Airfield Pavements written by J. F. Redus and published by . This book was released on 1956 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Flexible Airfield Pavement Evaluation written by United States. Army. Corps of Engineers and published by . This book was released on 1959 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Compaction Requirements for Soil Components of Flexible Airfield Pavements written by Waterways Experiment Station (U.S.) and published by . This book was released on 1959 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Airport Pavement Design and Evaluation written by and published by . This book was released on 1974 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book U S Air Force Pavements Conference written by United States. Air Force Pavements Conference. 3d, Berkeley, Calif., 1959 and published by . This book was released on 1959 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt:
