Download or read book Effects of Automobile Tire Loads on Thin Flexible Pavements written by Freddy L. Roberts and published by . This book was released on 1987 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report includes the results of an analytical study of the effects of automobile tire loads on thin asphalt pavements over flexible bases. Two different ways of calculating the tire contact pressure were used and the strains induced in the pavement structure were evaluated. The uniform pressure tire model assumes that the tire contact pressure is equal to the tire inflation pressure. The Tielking tire model is a finite element computer program that models the tire as a shell of revolution and calculates the contact pressure distribution by using the tire carcass properties and the tire load.

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 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 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 Impact of the Variation in Dynamic Vehicle Load on Flexible Pavement Responses written by Md Ahsanuzzaman and published by . This book was released on 2013 with total page 1708 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this research was to evaluate the dynamic variation in asphalt pavement critical responses due to dynamic tire load variations. An attempt was also made to develop generalized regression equations to predict the dynamic response variation in flexible pavement under various dynamic load conditions. The study used an extensive database of computed pavement response histories for five different types of sites (smooth, rough, medium rough, very rough and severely rough), two different asphalt pavement structures (thin and thick) at two temperatures (70 °F and 104 °F), subjected to a tandem axle dual tire at three speeds 25, 37 and 50 mph (40, 60 and 80 km/h). All pavement responses were determined using the 3D-Move Analysis program (Version 1.2) developed by University of Nevada, Reno. A new term called Dynamic Response Coefficient (DRC) was introduced in this study to address the variation in critical pavement responses due to dynamic loads as traditionally measured by the Dynamic Load Coefficient (DLC). While DLC represents the additional varying component of the tire load, DRC represents the additional varying component of the response value (standard deviation divided by mean response). In this study, DRC was compared with DLC for five different sites based on the roughness condition of the sites. Previous studies showed that DLC varies with vehicle speed and suspension types, and assumes a constant value for the whole pavement structure (lateral and vertical directions). On the other hand, in this study, DRC was found to be significantly varied with the asphalt pavement and function of pavement structure, road roughness conditions, temperatures, vehicle speeds, suspension types, and locations of the point of interest in the pavement. A major contribution of the study is that the variation of pavement responses due to dynamic load in a flexible pavement system can be predicted with generalized regression equations. Fitting parameters (R2) in the rage of 0.60 to 0.87 were observed the DRC predictive equations. In addition, verification of those generalized equations was evaluated using different sets of asphalt pavement structures and pavement materials. The differences between calculated and predicted values were found to be within ±20% for the maximum tensile strain and ±30% for the maximum compressive strain in the asphalt layer.

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 The Simulation of Vehicle Dynamic Effects on Road Pavements written by J. K. Hendrick and published by . This book was released on 1992 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Effects of Weather and Heavy Loads on Pavements written by National Highway Users Conference and published by . This book was released on 1941 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Structural Behavior of Asphalt Pavements written by Lijun Sun and published by Butterworth-Heinemann. This book was released on 2016-08-09 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Behavior of Asphalt Pavements provides engineers and researchers with a detailed guide to the structural behavioral dynamics of asphalt pavement including: pavement temperature distribution, mechanistic response of pavement structure under the application of heavy vehicles, distress mechanism of pavement, and pavement deterioration performance and dynamic equations. An authoritative guide for understanding the key mechanisms for creating longer lasting pavements, Structural Behavior of Asphalt Pavements describes the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performances, and demonstrates the process of pavement analyses and designs, approaching science from empirical analyses. Analyzes the external and internal factors influencing pavement temperature field, and provide a review of existing pavement temperature prediction models Introduces a “Bridge Principle through which pavement performance and fatigue properties are consolidated Defines the intrinsic consistency between macroscopic performance and microscopic response, structure and material, as well as global and local performance Summaries the mechanistic response of pavement structure under the application of heavy vehicle, distress mechanism of pavement, pavement deterioration performance and dynamic equations, and life cycle analysis of pavement

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 Texas Transportation Researcher written by and published by . This book was released on 1978 with total page 608 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 884 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 Transportation Weekly Government Abstracts written by and published by . This book was released on 1988 with total page 630 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Transactions of the American Society of Civil Engineers written by American Society of Civil Engineers and published by . This book was released on 2005 with total page 1176 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vols. 29-30 contain papers of the International Engineering Congress, Chicago, 1893; v. 54, pts. A-F, papers of the International Engineering Congress, St. Louis, 1904.

Download or read book An Investigation of Surface Cracking in Asphalt Concrete Resulting from Overloaded Vehicles written by Annie Yue Wen Chen and published by . This book was released on 1991 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: