Download or read book Pavement Response to Tire Inflation Pressure written by J. T. Christison and published by . This book was released on 1990-07-01 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent years increased attention has been given to assessing the effects of traffic load variables on pavement distress from in-situ pavement response measurements. In this study, an experimental investigation was carried out to assess the influence of tire pressure on 1) surface deflection, 2) asphaltic concrete - base layer interfacial tensile strains, and 3) surface compressive strains. The study involved monitoring pavement responses under two wheel loading configurations at three tire inflation pressures and comparing the responses with those obtained from concurrent tests with a standard load. In general, variations in the magnitude of the pavement response variables with changes in tire inflation pressure were small and unique. There were no identifiable trends of the pavement response ratios with tire pressure variation.

Download or read book Evaluation of Effects of Tire Size and Inflation Pressure on Tire Contact Stresses and Pavement Response written by and published by . This book was released on 2006 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: A specific objective was to establish how tire contact stresses may be modeled in existing layered elastic programs to better approximate the effects of non-uniform tire contact pressure distributions, and account for differences in tire construction, tire load, and tire inflation pressure on predicted pavement response. To this end, researchers assembled a data base of measured tire contact stresses and performed a comparative evaluation of methods for representing tire contact pressure distributions in existing models to predict performance-related pavement response variables. A computer program called TireView was developed that provides estimates of tire contact area as a function of tire type, tire load, and tire inflation pressure and predicts the stress distribution at the tire-pavement interface based on polynomial interpolations of measured tire contact stresses in the data base. A method for predicting pavement response using layered elastic analysis is proposed that is based on the predicted tire contact area.

Download or read book Effects of Heavy vehicle Characteristics on Pavement Response and Performance written by Thomas D. Gillespie and published by Transportation Research Board. This book was released on 1993 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Effect of Tire Pressure on Flexible Pavement Response and Performance written by Ramon Francis Bonaquist and published by . This book was released on 1988 with total page 35 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Damage as Related to Tires Pressures Axle Loads and Configurations written by PE. Sebaaly and published by . This book was released on 1992 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dual radial tires and wide base radial single tires were tested in the laboratory under three levels of inflation pressures and axial loads. The measured characteristics of the tires were gross contact area, net area, tire deflection, and contact pressures. The distributions of contact pressures were used in a theoretical analysis to evaluate the flexible pavement performance related parameter. The response of two flexible pavement structures was investigated in terms of the tensile strains at the bottom of the asphalt layer. In the second phase of this research, two full scale pavement sections were instrumented using strain gages to measure the strains at the bottom of the asphalt concrete layer. The data analysis presented in this paper shows the effect of varying the tire type, tire inflation pressure, and axle load and configuration on the response of flexible pavements. The results of the two studies showed that the wide base single tires are more damaging than the dual tires under all combinations of the test variables.

Download or read book Calibration of Pavement Response Models for the Mechanistic empirical Pavement Design Method written by Rong Luo and published by . This book was released on 2007 with total page 69 pages. Available in PDF, EPUB and Kindle. Book excerpt: Most pavement design methodologies assume that the tire-pavement contact stress is equal to the tire inflation pressure and uniformly distributed over a circular contact area. However, tire-pavement contact area is not in a circular shape and the contact stress is neither uniform nor equal to the tire inflation pressure. To precisely account for the effect of actual contact stress on pavement responses, this research evaluates pavement responses under the 3-D non-uniform stresses and under the uniform stress. The studied pavement responses include the horizontal strains at the pavement surface, the horizontal strains at the bottom of the asphalt layer, and the vertical strains at the top of subgrade. A multi-layer linear-elastic computer program, CIRCLY, is used to estimate pavement strains under a number of combinations of tire load, tire pressure, asphalt modulus, asphalt thickness and subgrade modulus. The Asphalt Institute method and the Shell method are used to predict the pavement fatigue life based on the critical strains at the bottom of the asphalt layer calculated by both 3-D stress model and the uniform stress model. Results show that the vertical contact stress component of the 3-D stresses has the dominant effect on the studied pavement strains. The effects of longitudinal stress component and the transverse stress component cannot be ignored, especially for pavement with a thin asphalt layer. Asphalt thickness, asphalt modulus, tire load and tire pressure have significant effects on the differences in asphalt strains between the 3-D stress model and the uniform stress model, but not on the difference in the vertical strains at the subgrade top. Subgrade modulus shows little effect on the differences in all studied strains predicted by the 3-D stress model and the uniform stress model. Tire pressure has greater effect than tire load on the fatigue life of a pavement with a thin asphalt layer. When the pavement has a thick asphalt layer, the effect of tire load is greater than the effect of tire pres, and a larger tire load is associated with a smaller number of load repetitions.

Download or read book The Effect of Tire Pressures on Flexible Pavements written by Freddy L. Roberts and published by . This book was released on 1986 with total page 264 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study includes the results of (1) a field study to determine the tire inflation pressures currently being carried by Texas highways, (2) a literature and analytical study to determine what tire contact pressures are actually being applied by modern tires to pavements, and (3) an analytical study to evaluate the effect of those contact pressures on the stresses and strains in typical Texas flexible pavements. Descriptions of the analytical studies include discussions of the finite element computer program used to model the tire carcass and the flexible pavements. The tires included in the analytical study included both truck and passenger car tires operated at typical loads and inflation pressures.

Download or read book Analysis of Tire pavement Interaction and Pavement Responses Using a Decoupled Modeling Approach written by Hao Wang and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The proper understanding of tire-pavement interaction is important for the accurate analysis of load-induced stresses and strains in the pavement structure. This dissertation focuses on the analysis of the mechanism of tire-pavement interaction and the effect of tire-pavement interaction on pavement responses using a decoupled modeling approach. First, an air-inflated three-dimensional (3-D) finite element (FE) tire model was built and the interaction between a tire and a non-deformable pavement surface was simulated. The tire is modeled as a composite structure including rubber and reinforcement. The steady-state tire rolling process was simulated using an Arbitrary Lagrangian Eulerian (ALE) formulation. The developed tire-pavement interaction model is used to evaluate the mechanism of load distribution at the tire-pavement interface under various tire loading and rolling conditions. After that, a 3-D FE model of flexible pavement was developed to analyze pavement responses under various loading scenarios. This model utilizes the implicit dynamic analysis, simulates vehicular loading as a continuous moving load, and incorporates 3-D contact stresses at the tire-pavement interface. In the pavement model, the asphalt layer is modeled as a linear viscoelastic material and the granular base layer is modeled as a nonlinear anisotropic material. The FE pavement model was used to analyze critical pavement responses in thin and thick asphalt pavements considering different damage mechanisms. This dissertation concludes that knowledge of tire-pavement contact stress distributions is critical for pavement response prediction. Most importantly, the non-uniform distribution of vertical contact stresses and the localized tangential contact stresses should be considered in the mechanistic-empirical pavement design. The contact stress distributions at the tire-pavement interface are affected by vehicle loading (wheel load and tire inflation pressure), tire configuration (dual-tire assembly and wide-base tire), vehicle maneuvering (braking/acceleration and cornering), and pavement surface friction. Therefore, pavement damage should be quantified using accurate loading inputs that are represented by realistic tire-pavement contact stress distributions. Thin and thick asphalt pavements fail in different ways. Multiple distress modes could occur in thin asphalt pavements, including bottom-up fatigue cracking and rutting in each pavement layer. It was found that the interaction between the viscoelastic asphalt layer and the nonlinear anisotropic granular base layer plays an important role for the stress distribution within a thin asphalt pavement structure under moving vehicular loading. In thick asphalt pavements, near-surface cracking is a critical failure mechanism, which is affected by the localized stress states and pavement structure characteristics. Particularly, the effect of shear stress on the formation of near-surface cracking at multi-axial stress states is important and can not be neglected, especially at high temperatures.

Download or read book Effect of Truck Tire Inflation Pressure and Axle Load on Pavement Performance written by and published by . This book was released on 1985 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report presents the results of an investigation into the effect of truck tire inflation pressure and axle load on flexible and rigid pavement performance as determined using computer analysis. The flexible pavement analysis was conducted with both a nonuniform pressure model and a uniform pressure model as input to the elastic layer program BISAR and the 3D finite element program TEXGAP-3D. A rigid pavement analysis was conducted with both a nonuniform pressure model and a uniform pressure model as input to the program JSLAB.

Download or read book Pavement Testing Facility written by Ramon Francis Bonaquist and published by . This book was released on 1989 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The effects of tire pressure on flexible pavement response and performance were evaluated using data from the first phase of research at the Federal Highway Administration's Pavement Testing Facility. The Accelerated Loading Facility testing machine was used to simulate traffic loading. The evaluation consisted of three components. First, deflections and strains for various combinations of load and tire pressure were measured and compared. Second, rutting and cracking for two test sections trafficked with the same load but different tire pressures were evaluated. Finally, changes in the pavement materials resulting from traffic were compared for the two sections trafficked with different tire pressures. These three evaluations showed tire pressure to be a second order effect. The effect of tire pressure on flexible pavement response and performance was less significant the effects of load and temperature. During the response experiment, when load and temperature were constant, the effects of tire pressure could be observed. However, in the performance and materials evaluations, the effects of increased tire pressure were masked by differences in temperature"--Technical report documentation page.

Download or read book Effect of Tire Pressure and Types on the Response of Flexible Pavement written by P. Sebaaly and published by . This book was released on 1988 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Pavement Testing Facility written by and published by . This book was released on 1989 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vehicle Tire Pavement Interface written by John Jewett Henry and published by ASTM International. This book was released on 1992 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Asphalt Paving Technology 2011 written by Eugene L. Skok and published by DEStech Publications, Inc. This book was released on 2011-06-28 with total page 801 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Introduction to Unmanned Aircraft Systems Second Edition written by Douglas M. Marshall and published by CRC Press. This book was released on 2015-10-26 with total page 1944 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.

Download or read book Experimental Investigation of Truck Tire Inflation Pressure on Pavement tire Contact Area and Pressure Distribution written by Kurt M. Marshek and published by . This book was released on 1985 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Wide base Truck Tire Effects on Pavement Performance and Vehicle Regulatory Legislation written by Raymond K. Moore and published by . This book was released on 1992 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current operating practice in the trucking industry related to tire pressures and truck tires are summarized. Findings of recent (since 1987) pertiment pavement performance research including both full-scale and analytical pavement response and performance studies are discussed. Pertinent findings developed in previous literature reviews are also included. Regulatory approaches developed by the various states based on information from a telephone survey conducted during July and August 1991 are included. Economic analyses are used to compare the increased annualized bituminous pavement rehabilitation costs with trucking industry benefits. Recommendations regarding the regulation of wide-base truck tires are presented.