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Vehicle‐Bridge‐Interaction in the Dynamic Calculation of Railway Bridges: Case Study and Dynamic Analysis for 75 Existing Simply Supported Bridge Structures of the Austrian Railway Network
Author(s) -
Glatz Bernhard,
Fink Josef
Publication year - 2019
Publication title -
ce/papers
Language(s) - English
Resource type - Journals
ISSN - 2509-7075
DOI - 10.1002/cepa.1035
Subject(s) - structural engineering , bridge (graph theory) , derailment , moving load , slab , engineering , vibration , damper , track (disk drive) , finite element method , mechanical engineering , medicine , physics , quantum mechanics
The dynamic calculation of railway bridges for high speed traffic has become a topic of great interest for engineers and researchers in recent decades. Certain velocities of a crossing train can lead to resonance phenomenons, either caused by consecutive axle loads or the critical velocity of one single load. In these cases, the bridge structure is exposed to excessive vibrations that lead to vertical accelerations and deflections. In order to avoid track irregularities and the risk of derailment as a possible consequence, the limits for vertical accelerations are prescribed in European and national standards. The results of dynamic calculations depend on the level of detail of both, the bridge model and the vehicle model. This paper focuses on the influence of the vehicle model for 75 existing simply supported bridges (15 steel structures, 2 composite steel and concrete structures, 11 filler beam structures and 47 concrete slab structures) in the Austrian railway network. The commonly used Moving Load Model (train modelling as a series of moving loads) is compared to the more sophisticated Detailed Interaction Model (train modelling as a combination of masses, springs and dampers) of the Railjet train. The bridge structures are modelled as simply supported Bernoulli‐Euler beams. It is shown, which potential is hidden in the more complex and time intensive calculation with the Detailed Interaction Model compared to the Moving Load Model. Furthermore, the validity of the Additional Damping Method is analysed.