A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Dimensioning of ballastless tracks
The introduction of advanced high-speed trains has resulted in more stringent requirements placed on the construction and maintenance of track systems. Faster speeds, greater wheel and axle loads, and an increase in mixed traffic have all led to faster wear on track facilities and, in turn, to greater maintenance costs. Design and construction of track systems must of course take these developments into sufficient account. In design dimensioning of ballastless track systems, Load Model UIC 71 (Union Internationale des Chemins de fer) is taken as basis for loading assumptions in work with advanced high-speed rail traffic. Load Model UIC 71 also covers load conditions for heavy freight trains in mixed operations. If, however, a rail line is used purely for either freight or for passenger operations, the values contained in the load model may be reduced by a certain factor. In addition to static loads, however, supplementary factors must included for curved track sections, as well as to account for dynamic forces. Results calculated for the example of the RHEDA 2000 system disclose that not only strict quality adherence is especially essential in this context, but that a crucial factor is likewise the assurance of satisfactory bond characteristics between the HSL (hydraulically bound support layer) and the supporting concrete slab. This can be achieved by sweeping the HSL and by moistening before installation of the supporting concrete layer. For a system with such a bond, the calculated bending stresses lie below limits for allowed values - also under the aspect of track systems with long service life.
Dimensioning of ballastless tracks
The introduction of advanced high-speed trains has resulted in more stringent requirements placed on the construction and maintenance of track systems. Faster speeds, greater wheel and axle loads, and an increase in mixed traffic have all led to faster wear on track facilities and, in turn, to greater maintenance costs. Design and construction of track systems must of course take these developments into sufficient account. In design dimensioning of ballastless track systems, Load Model UIC 71 (Union Internationale des Chemins de fer) is taken as basis for loading assumptions in work with advanced high-speed rail traffic. Load Model UIC 71 also covers load conditions for heavy freight trains in mixed operations. If, however, a rail line is used purely for either freight or for passenger operations, the values contained in the load model may be reduced by a certain factor. In addition to static loads, however, supplementary factors must included for curved track sections, as well as to account for dynamic forces. Results calculated for the example of the RHEDA 2000 system disclose that not only strict quality adherence is especially essential in this context, but that a crucial factor is likewise the assurance of satisfactory bond characteristics between the HSL (hydraulically bound support layer) and the supporting concrete slab. This can be achieved by sweeping the HSL and by moistening before installation of the supporting concrete layer. For a system with such a bond, the calculated bending stresses lie below limits for allowed values - also under the aspect of track systems with long service life.
Dimensioning of ballastless tracks
Freudenstein, Stephan (author) / Haban, Franz (author)
2005
15 Seiten, 25 Bilder, 5 Quellen
Conference paper
English
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