Ryan G. Kernes

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An improved understanding of the vertical load path is necessary for improving the design methodology for concrete crossties and fastening systems. This study focuses on how the stiffness, geometry, and interface characteristics of system components affect the flow of forces in the vertical direction. An extensive field test program was undertaken to(More)
38 To meet the increasingly stringent design and performance requirements due to increasing 39 cumulative gross tonnages from heavy-haul freight operations, along with 40 increased high-speed inter-city passenger rail development, improvements in 41 concrete crosstie designs are needed. Rail Seat Deterioration (RSD) continues to be 42 identified as one of(More)
Increasing axle loads of today’s North American heavy haul freight trains have presented numerous engineering challenges for the design and performance of concrete crossties and fastening systems. Several research studies have been conducted to understand the path of the vertical load from the wheel/rail interface through the fastening system and into the(More)
Understanding the performance and serviceability of concrete sleepers and elastic fastening systems is critical as the loading demands increase as a result of the increasing freight axle loads and cumulative gross tonnages as well as the development of high-speed passenger rail in North America. In light of these ever increasing demands, it is essential to(More)
26 To support the increasingly rigorous performance demands due to growing heavy-haul freight operations 27 and increased high-speed intercity passenger rail development worldwide, advancements in concrete 28 crosstie fastening system designs are needed. Improvements to the components responsible for 29 attenuating loads and protecting the concrete crosstie(More)
Rail seat deterioration (RSD) continues to be identified as one of the primary factors limiting concrete crosstie service life in North America. RSD refers to the degradation of material at the contact interface between the concrete crosstie rail seat and the rail pad that protects the bearing area of the crosstie. Industry experts consider abrasion to be a(More)
A sustained increase in gross rail loads and cumulative freight tonnages on heavy haul railways, as well as increased interest in highand higher-speed passenger rail development, is placing an increasing demand on railway infrastructure and its components. Rail seat deterioration (RSD) refers to the degradation of the material at the contact interface(More)
Special trackwork, including turnouts and crossing diamonds and their components, plays a vital role in railway infrastructure by providing route flexibility to trains as they travel across a network. As the interest in shared rail corridors involving heavy-axle-load freight traffic and high-speed-rail passenger traffic grows, special trackwork represents a(More)
To achieve the performance demands due to growing heavy-haul freight operations and increased high-speed rail service worldwide, advancements in concrete crosstie fastening systems are required. A mechanistic design approach based on scientific principles and derived from extensive laboratory and field investigation has the potential to improve the current(More)
Based on the results of a 2008 railway industry survey on concrete sleepers, rail seat deterioration (RSD) is the most critical problem with concrete sleeper performance on North American freight railroads. RSD is the degradation of the concrete underneath the rail and results in track geometry problems and loss of fastening toe load. Currently, mechanisms(More)