Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 36 for “"wheel load"”.
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Characterizing Aircraft Multiple Wheel Load Interaction for Airport Flexible Pavement Design
"Procedure 2 (""Engineering Approach""). Average Layer Moduli values obtained from SW non-linear axisymmetric FE analysis are input into an ELP to solve responses for the MW assembly."
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Finite Element Analysis of Insulated Railroad Joints
… in the field has decreased due to increasing wheel loads. The goal of this research is to investigate possible changes in insulated rail joint design in order to improve the performance of the insulated joint. The finite element program ABAQUS is used to model the supported butt joint. In this …
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Determination of AASHTO Bridge Design Parameters through Field Evaluation of the Rt. 601 Bridge: A Bridge Utilizing Strongwell 36 in. Fiber-Reinforced Polymer Double Web Beams as the Main Load Carrying Members
… the following AASHTO bridge design parameters: wheel load distribution factor g, dynamic load allowance IM, and maximum deflection. The wheel load distribution factor was determined to be S/5, a dynamic load allowance was determined to be 0.30, and the maximum deflection of the bridge was …
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Cálculo de cargas de roda equivalente no dimensionamento de pavimentos flexíveis: programação automática
… in 1928, describing work related to equivalent wheel load and the present criterium for its determination. 2) A computer program for the determination of equivalent single wheel load (ESWL), for any type of aircraft, using the CBR method. Variables taken into account: CBR value and Poisson ratio …
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The Behavior of Pore Water Pressure in Cohesive Subgrade Soils
… the stiffness of soil decreased as the number of loading cycles increased. Tensiometers were installed at U.S. 23 to observe the behavior of pore water pressure in flexible and rigid pavement, and then the Falling Weight Deflectometer (FWD) was used to simulate the effect of a moving wheel load. …
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Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model
… and fastening system under vertical and lateral wheel load using finite element analysis, and explore possible improvement for current track design standard. The damage of fastening system is one of the most prevalent failure causes for concrete crosstie track, however the current AREMA design …
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Evaluation of the In-Servic Performance of the Tom's Creek Bridge
… polymer (FRP) composite girders as the main load carrying members. The project is intended to serve two purposes. First, by calculating bridge design parameters such as the dynamic load allowance, transverse wheel load distribution and deflections under service loading, the Tom's Creek Bridge …
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Long-term In-service Evaluation of Two Bridges Designed with Fiber-Reinforced Polymer Girders
… for two years. Researchers have conducted load tests at both bridges to determine if their performance has changed during their respective service lives. The key design parameters under consideration are: deflection, wheel load distribution, and dynamic load allowance. The results from the …
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Characterization of Anisotropic Granular Layer Behavior in Flexible Pavements
… granular materials from triaxial repeated load testing with using UI-FastCell which has custom designed for testing unbound granular materials with unique capabilities. The cross-anisotropic behaviors of different granular materials were studied with varying material type, gradation, …
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Development of Design Criteria for Simply Supported Skew Slab-and-Girder Bridges (Distribution, Load, Truck, Live, Wheel)
… procedure is an improvement on the AASHTO wheel load fractions which do not include the effects of skew. The precast prestressed concrete and steel I-beam girders are modeled as eccentric stiffeners which cause shear lag in the slab. The effect of skew on the solution accuracy is …
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Experimental Evaluation of Wheel-Rail Interaction
… provides a detailed experimental evaluation of wheel-rail interaction for railroad vehicles, using the Virginia Tech Federal Railroad Administration (VT-FRA) Roller Rig. Various contact dynamics that emulate field application of railroad wheels on tracks are set up on the rig under precise, …
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Three-Dimensional Finite Element Analysis of Multilayered Systems: Comprehensive Nonlinear Analysis of Rigid Airport Pavement Systems
… domain size and localized multiple pressure loads, efficient mesh construction and load discretization are very important issues in the structural modeling of airport pavement systems. This dissertation covers (1) the characterization of airport pavement systems, (2) the construction of …
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Improved Load Distribution for Load Rating of Low-Fill Box Structures
… at shallow depths. Periodic evaluation of their load carrying capacities is required for load rating of the culvert by determining a rating factor (RF) or truck tonnage of a HS truck. The rating factor is defined as the capacity of the structure minus the dead load demand, and then divided by the …
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Innovative Design Concepts for Insulated Joints
… a Tinius Olsen compressive tester. A rolling-wheel load test is performed on a prototype IMC component installed in rail. Finally, a prototype of a complete IMC insulated joint is fabricated and installed on the FAST test track at TTCI facility in Pueblo, Colorado for field evaluation. …
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Desempenho de pavimentos de baixo custo no Estado do Paraná
… The vehicular traffic, in terms of equivalent wheel load factors, is also discussed. This discussion draws the conclusion that the pavement designers should make a better use of the theoretical mechanistic approach in order to decide the factors to be used in their designs. Materials used in …
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Live Load Testing and Analysis of the Southbound Span of U.S. Route 15 over Interstate-66
… Pilot Program, researchers have performed live load tests on the U.S. Route 15 Southbound bridge over Interstate-66. The main performance and behavior characteristics focused on are service strain and deflection, wheel load distribution, dynamic load allowance, and rotational behavior of bridge …
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Determination of Lateral Resistance of Deck Tie Fasteners in Smooth Top Bridge Girders
… frictional resistance is a product of the train wheel load and the friction coefficient. Fastener resistance was determined to be a function of fastener type and lateral track displacement. Finally, dap resistance was found to be a function of the area of the shear plane in a dapped tie. A …
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Prestressed concrete railway crosstie support variability and its effect on flexural demand
… processes that the track system undergoes during loading as trains pass over. For example, the current structural models used for concrete crosstie flexural analysis and design assume that the ballast bearing support is static and consistently located in a specific region under the crosstie. This …
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Fatigue response of fabric reinforced polymeric composites
… the behavior of these composites under fatigue loading.;In this study three fabric based glass FRP composites used in bridge components were tested under fatigue loading. A fatigue life prediction model is proposed, with internal strain energy as damage metric, to predict the useful life of FRP …
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Characterization of the loading environment for shared-use railway superstructure in North America
A sustained increase in heavy axle loads and cumulative freight tonnages, coupled with increased development of high speed passenger rail, is placing an increasing demand on railway infrastructure. Some of the most critical areas of the infrastructure in need of further research are track …
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