Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Numerical Studies on Soil Structure Interaction of Integral Railway Bridges with Different Backfills
Integral bridge abutments interact strongly with their backfills, especially due to seasonal thermal loading. For higher train speeds or axle loads, railway transition zones are designed with different variations of wedge-shaped cemented granular mixtures or lean concrete. These backfills behave substantially different under lateral cyclic loading compared to granular backfills. Thus, the backfill choice could have a major impact on the design of the integral structure. Therefore, this paper investigates the soil-structure interaction of integral railway bridges with various backfills by means of 2D FE analyses (FEA). First, the abilities of two advanced soil models to model the cyclic earth pressure mobilisation are evaluated. For this task, test data of 1g cyclic laboratory tests are used and the Hardening Soil model with small-strain stiffness (Benz 2006) and the hypoplastic model with intergranular strain (Niemunis and Herle 1997) are applied. Based on these preliminary studies a 2D FE model of an integral railway bridge on spread footing is used to perform a sensitivity analysis of the model parameters’ influence on the cyclic lateral stress. At last, the model is adapted for different German railway backfill designs. In this study the wedge-shaped designs show (significantly) higher lateral forces, that exceed the existing analytical approach according to Vogt (1984).
Numerical Studies on Soil Structure Interaction of Integral Railway Bridges with Different Backfills
Integral bridge abutments interact strongly with their backfills, especially due to seasonal thermal loading. For higher train speeds or axle loads, railway transition zones are designed with different variations of wedge-shaped cemented granular mixtures or lean concrete. These backfills behave substantially different under lateral cyclic loading compared to granular backfills. Thus, the backfill choice could have a major impact on the design of the integral structure. Therefore, this paper investigates the soil-structure interaction of integral railway bridges with various backfills by means of 2D FE analyses (FEA). First, the abilities of two advanced soil models to model the cyclic earth pressure mobilisation are evaluated. For this task, test data of 1g cyclic laboratory tests are used and the Hardening Soil model with small-strain stiffness (Benz 2006) and the hypoplastic model with intergranular strain (Niemunis and Herle 1997) are applied. Based on these preliminary studies a 2D FE model of an integral railway bridge on spread footing is used to perform a sensitivity analysis of the model parameters’ influence on the cyclic lateral stress. At last, the model is adapted for different German railway backfill designs. In this study the wedge-shaped designs show (significantly) higher lateral forces, that exceed the existing analytical approach according to Vogt (1984).
Numerical Studies on Soil Structure Interaction of Integral Railway Bridges with Different Backfills
Lecture Notes in Civil Engineering
Barla, Marco (Herausgeber:in) / Di Donna, Alice (Herausgeber:in) / Sterpi, Donatella (Herausgeber:in) / Insana, Alessandra (Herausgeber:in) / Stastny, Alexander (Autor:in) / Tschuchnigg, Franz (Autor:in)
International Conference of the International Association for Computer Methods and Advances in Geomechanics ; 2022 ; Turin, Italy
31.07.2022
8 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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