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 17 of 17 for “"fastening system"”.
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Field test program of the concrete crosstie and fastening system
… performance of concrete crossties and elastic fastening systems must be upgraded. As a part of a study aimed at improving concrete crossties and fastening systems, field experimentation was performed at the Transportation Technology Center (TTC) in Pueblo, CO by researchers from the University …
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Railroad track fastening system demands and response: Implications for mechanistic design
The student, Marcus Dersch, submitted this Dissertation for approval on 2022-04-20 at 09:13.
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Capacity analysis and throughput increase of an automated robotic fastening system
… is in the midst of implementing a new robotic fastening system that has been designed with flexibility as a key feature. This thesis describes work done build a model of the new system in order to estimate the capacity of the system. It then presents several recommendations to increase the …
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Mechanistic analysis of concrete crosstie and fastening system using field-validated finite element model
… the performance of concrete crosstie 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 …
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Determination of load path through concrete crosstie and fastening system: a laboratory and field investigation
… In this research, the behavior of crosstie and fastening system is investigated through material-level, component-level and system-level laboratory and field experiments. The system-level experiments use three primary test setups. One of these setups, referred to as a static single-crosstie and …
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Finite element analysis of railway track under vehicle dynamic impact and longitudinal loads
… of longitudinal restraint of existing rail fastening system and its dependency on track parameters affects the future design of rail fastening system. This thesis focuses on investigating numerically these two problems using finite element (FE) method. An FE model with multiple crossties and …
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Multifaceted approach for the analysis of rail pad assembly response
… worldwide, advancements in concrete crosstie fastening systems are required. A mechanistic design approach based on scientific principles, derived from extensive laboratory and field investigation and combined with computational analyses, has the potential to improve the current …
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Analysis of the performance and failure of railroad concrete crossties with various track support conditions
… or degraded concrete crossties and their fastening system components is not fully understood, but it is widely accepted that these conditions may have a significant influence on the demands placed on concrete crossties. To quantitatively describe the correlation between support conditions …
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The calculation of noise from railway bridges and viaducts
Pandrol Rail Fastenings Limited are a designer and manufacturer of railway rail-fastening systems. As an organisation they have the capability to reduce the noise impact of bridges using resilient track components. They also have a commercial interest in providing such technology. Knowledge of the …
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Quantification of rail seat load distributions on concrete crossties
… study aimed at improving concrete crossties and fastening systems, researchers at UIUC are attempting to characterize the loading environment at the rail seat using matrix-based tactile surface sensors (MBTSS). This instrumentation technology has been implemented in experimentation utilizing both …
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Development of ice-bonded ballast in sub-freezing temperatures and its effect on maintenance operations during a winter rail break
… track resistance (f0) to restrain the track system has been quantified by crosstie-type and ballast condition (e.g., consolidated or disturbed). Sub-freezing temperatures produce the largest differentials between the rail temperature and RNT (rail neutral temperature) [i.e., differential …
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Analysis of the design of railroad track superstructure components for rail transit applications
… of railroad superstructure in rail transit systems was conducted at the University of Illinois at Urbana-Champaign (UIUC) as part of a research program funded by the Federal Transit Administration (FTA). Focusing on field characterization of the performance of prestressed monoblock concrete …
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Hydraulic Mechanisms of Concrete-Tie Rail Seat Deterioration
… wide gauge, insufficient rail cant, and loss of fastening toe load. Currently, the problem is not sufficiently understood to enable development of effective solutions. The primary causes of RSD appear to be high stresses at the rail seat, a loosened fastening system, the presence of moisture, and …
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Longitudinal forces in continuously welded rails due to nonlinear track-bridge interaction for loading sequences
… by a ballast, for a ballasted track, or by a fastening system in the case of slab track. The deformation state of the coupling interface characterizes the behaviour of the system, whether elastic or plastic. Therefore, the nonlinear behaviour is valid for the system. To accommodate the …
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Design, Validation, and Clinical Testing of a Novel Fastening Device for a Scoliosis Brace
… down. The overall goals were to develop a novel fastening device, or controlled tension unit (CTU), for a scoliosis brace that allowed the user to set the strap tension to the prescribed value as determined by the orthotist at the time of brace fitting and to maintain the prescribed strap tension …
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Understanding the vertical load path under static and dynamic loads in concrete crosstie and fastening systems
… design approach for the crossties and fastening systems. It is important to follow the flow of forces through the system to understand the demands on each individual component. In spite of extensive research focusing on the vertical load path a lack of clear understanding of the loads …
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The mechanics of abrasion on concrete crosstie rail seats
A sustained increase in gross rail loads and cumulative freight tonnages on heavy haul railways, as well as increased interest in high and higher-speed passenger rail development, is placing an increasing demand on railway infrastructure and its components. Several failure mechanisms are limiting …