This review indicated that (i) asphalt underlayment (AUL), asphalt overlayment (AOL), surface asphalt mixture impermeable (SAMI) and asphalt stabilized ballast (ASB), as geometry-based classifications are proposed (ii) load distribution, bearing capacity, vibration control, and moisture resistance, as well as thermal viscoelasticity, are the common mechanical behaviors of AUL and AOL, while the latter more focuses on vibration control, noise reduction, and interlayer contact. In this paper, a state-of-the-art review is conducted to comprehensively summarize the research and application progress of railway asphalt trackbed, in terms of the typical geometric composition, structural mechanical behavior, and material design. The various steps involved in the calculations are highlighted during the tutorial phase of a sample design calculations and analysis.Īsphalt trackbed, as an asphalt-based design below rails, has been increasingly applied with numerous merits in railway substructure. The types of roadbed and trackbed configurations are selected to meet each of the various performance ranks. In addition, it is possible to performance-rank different track sectional designs based on the relative importance of the particular track section and track type. It is possible with KENTRACK 3.0 to select trackbed layers and associated thicknesses to satisfy roadbed and trackbed performance requirements. The graphical user interface in the KENTRACK 3.0 provides a technique to analyze trackbeds as structures. The latest version, KENTRACK 3.0, is coded in C#.NET, a popular computer language for achieving accuracy and efficiency. The service lives of the individual components of the trackbed are predicted by damage analysis for various combinations of traffic, tonnages, subgrade support, component layer properties and thicknesses. In addition, it is possible to consider the fatigue lives of the various layers relative to the effects of wheel loads, tonnages, environmental conditions and other factors. The principle factor in the analysis is to limit vertical compressive stresses on the subgrade. The versatility was recently expanded to analyze trackbeds containing a combination of granular and asphalt layers. Kentrack was initially developed to analyze traditional all-granular layered trackbeds and asphalt layered trackbeds. I even forced spotlight to reindex the folder within which it's saved, but HD still can't find it via search within the open box.KENTRACK is a layer elastic finite element based computer program that can be utilized for a performance-based structural design and analysis of railway trackbeds. It can't even find my ".dwg" files created by HighDesgin 2017.1 BETA 4 within the import or open dialogue box. There's definitely an issue with what HighDesgin 2017.1 thinks is a ".dwg" file. And the ones it does finds are NOT greyed out and can be imported from the import dialogue box. If I search for ".dwg" in the open dialogue box in HighDesgin 2017.1 BETA 4, it does find some DWGs but far from all of them. I also used another app that can read DWGs and did the same thing there, typed "Test.dwg" into the search field and it found it instantly. Spotlight search found it both from the menu bar and in the finder. I searched for that file in the open dialogue box in HighDesgin 2017.1 BETA 4 (Including "Name matches: Test") and HD couldn't find it. I created a test DWG document from HD and called it "TEST.DWG". I have discovered another strange issue related to importing DWG files.
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