Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Optimisation of slab track design considering dynamic train–track interaction and environmental impact
https://orcid.org/0000-0002-3796-9232
https://orcid.org/0000-0002-4516-7440
Abstract Modern railway tracks for high-speed traffic are often built based on a slab track design. A major disadvantage of slab track compared to conventional ballasted track is that the environmental impact of the construction is higher due to the significant amount of concrete required. In this paper, the dimensions of the rectangular cross-sections and the types of concrete used in slab tracks are optimised with the objective to minimise greenhouse gas emissions, while considering the constraint that the design must pass the static dimensioning analysis described in the European standard 16432-2. The optimised track design is also analysed using a three-dimensional (3D) model of vertical dynamic vehicle–track interaction, where the rails are modelled as Rayleigh–Timoshenko beams and the concrete parts are represented by quadratic shell elements. Wheel–rail contact forces and the time-variant stress field of the concrete parts are calculated using a complex-valued modal superposition for the finite element model of the track. For the studied traffic scenario, it is concluded that the thickness of the panel can be reduced compared to the optimised design from the standard without the risk of crack initiation due to the dynamic vehicle load. In parallel, a model of reinforced concrete is developed to predict crack widths, the bending stiffness of a cracked panel section and to assess in which situations the amount of steel reinforcement can be reduced. To reduce the environmental impact even further, there is potential for an extended geometry optimisation by excluding much of the concrete between the rails.
Highlights Combination of static and dynamic vehicle–track interaction models. Design optimisation to minimise environmental footprint. Design improvement potential, compared to an existing standard, is identified. The influence of cracks in the concrete panel on dynamic wheel loads is small. The restraint degree affects the steel stress and crack width significantly.
Optimisation of slab track design considering dynamic train–track interaction and environmental impact
https://orcid.org/0000-0002-3796-9232
https://orcid.org/0000-0002-4516-7440
Abstract Modern railway tracks for high-speed traffic are often built based on a slab track design. A major disadvantage of slab track compared to conventional ballasted track is that the environmental impact of the construction is higher due to the significant amount of concrete required. In this paper, the dimensions of the rectangular cross-sections and the types of concrete used in slab tracks are optimised with the objective to minimise greenhouse gas emissions, while considering the constraint that the design must pass the static dimensioning analysis described in the European standard 16432-2. The optimised track design is also analysed using a three-dimensional (3D) model of vertical dynamic vehicle–track interaction, where the rails are modelled as Rayleigh–Timoshenko beams and the concrete parts are represented by quadratic shell elements. Wheel–rail contact forces and the time-variant stress field of the concrete parts are calculated using a complex-valued modal superposition for the finite element model of the track. For the studied traffic scenario, it is concluded that the thickness of the panel can be reduced compared to the optimised design from the standard without the risk of crack initiation due to the dynamic vehicle load. In parallel, a model of reinforced concrete is developed to predict crack widths, the bending stiffness of a cracked panel section and to assess in which situations the amount of steel reinforcement can be reduced. To reduce the environmental impact even further, there is potential for an extended geometry optimisation by excluding much of the concrete between the rails.
Highlights Combination of static and dynamic vehicle–track interaction models. Design optimisation to minimise environmental footprint. Design improvement potential, compared to an existing standard, is identified. The influence of cracks in the concrete panel on dynamic wheel loads is small. The restraint degree affects the steel stress and crack width significantly.
Optimisation of slab track design considering dynamic train–track interaction and environmental impact
https://orcid.org/0000-0002-3796-9232
https://orcid.org/0000-0002-4516-7440
Abstract Modern railway tracks for high-speed traffic are often built based on a slab track design. A major disadvantage of slab track compared to conventional ballasted track is that the environmental impact of the construction is higher due to the significant amount of concrete required. In this paper, the dimensions of the rectangular cross-sections and the types of concrete used in slab tracks are optimised with the objective to minimise greenhouse gas emissions, while considering the constraint that the design must pass the static dimensioning analysis described in the European standard 16432-2. The optimised track design is also analysed using a three-dimensional (3D) model of vertical dynamic vehicle–track interaction, where the rails are modelled as Rayleigh–Timoshenko beams and the concrete parts are represented by quadratic shell elements. Wheel–rail contact forces and the time-variant stress field of the concrete parts are calculated using a complex-valued modal superposition for the finite element model of the track. For the studied traffic scenario, it is concluded that the thickness of the panel can be reduced compared to the optimised design from the standard without the risk of crack initiation due to the dynamic vehicle load. In parallel, a model of reinforced concrete is developed to predict crack widths, the bending stiffness of a cracked panel section and to assess in which situations the amount of steel reinforcement can be reduced. To reduce the environmental impact even further, there is potential for an extended geometry optimisation by excluding much of the concrete between the rails.
Highlights Combination of static and dynamic vehicle–track interaction models. Design optimisation to minimise environmental footprint. Design improvement potential, compared to an existing standard, is identified. The influence of cracks in the concrete panel on dynamic wheel loads is small. The restraint degree affects the steel stress and crack width significantly.
Optimisation of slab track design considering dynamic train–track interaction and environmental impact
Aggestam, Emil (Autor:in) / Nielsen, Jens C.O. (Autor:in) / Lundgren, Karin (Autor:in) / Zandi, Kamyab (Autor:in) / Ekberg, Anders (Autor:in)
Engineering Structures ; 254
07.12.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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