Numerical analysis of beam rail bridges with random track irregularities

The study focuses on dynamic analysis of composite bridge / track structure / train systems (BTT systems) with random vertical track irregularities taken into consideration. The paper presents the results of numerical analysis of advanced virtual models of series-of-types of single-span simply-supported railway steel-concrete bridges (SCB) with symmetric platforms, located on lines with the ballasted track structure adapted to traffic of high-speed trains.

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Vertical vibrations of composite bridge/track structure/high-speed train systems. Part 1: Series-of-types of steel-concrete bridges

Bulletin of the Polish Academy of Sciences Technical Sciences ◽

10.2478/bpasts-2014-0018 ◽

2014 ◽

Vol 62 (1) ◽

pp. 165-179 ◽

Cited By ~ 3

Author(s):

M. Podworna ◽

M. Klasztorny

Keyword(s):

High Speed ◽

Concrete Bridges ◽

Track Structure ◽

High Speed Train ◽

Limit States ◽

Material Optimization ◽

Ballasted Track ◽

Composite Bridge ◽

Vertical Vibrations ◽

Structural Solutions

Abstract A new series-of-types of single-span simply-supported railway composite (steel-concrete) bridges, with a symmetric platform, has been designed according to the Polish bridge standards. The designed bridges/viaducts are located on the main railways of the classification coefficient k = +2. A ballasted track structure adapted to high operating speeds has also been designed. The ultimate limit states and the limit states corresponding to the bridges undertaken are collected and discussed. The bridges have been designed in accordance with contemporary art engineering, with geometric and material optimization, avoiding overdesign. A new methodology of numerical modelling and simulation of dynamic processes in composite bridge/ballasted track structure/high speed train systems, developed in Part 2 and Part 3, has been applied and implemented in a problem-oriented computer programme. A new approach to predicting forced resonances in those systems is formulated and tested numerically. It has been proved that in the case of typical structural solutions of bridges and ballasted track structures, it is necessary to introduce certain limitations for operating speeds of trains

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Effect of random track irregularities on selected composite bridge / track structure / high-speed train system vibrations

Budownictwo i Architektura ◽

10.35784/bud-arch.2207 ◽

2013 ◽

Vol 12 (1) ◽

pp. 259-266

Author(s):

Monika Podworna ◽

Marian Klasztorny

Keyword(s):

High Speed ◽

Contact Stiffness ◽

Track Structure ◽

Computer Algorithms ◽

High Speed Train ◽

Approach Slabs ◽

Composite Bridge ◽

Random Track Irregularities ◽

Train System ◽

Track Irregularities

A theory of the quasi-exact physical and mathematical modelling of the composite (steel–concrete) bridge / ballasted track structure / high-speed train system (BTT) was developed, including viscoelastic suspensions of rail-vehicles on two-axle bogies, the non-linear Hertz contact stiffness and one-sided contact between the wheel sets and the rails, the viscoelastic and inertia features of the bridge, the viscoelastic track structure on and beyond the bridge, the approach slabs, and random track irregularities. Based on this theory, advanced computer algorithms for the BTT numerical modelling were written and a computer program to simulate the vertical vibrations of the BTT systems was developed. The bridge subject to the preliminary dynamic analysis and designed according to Polish standards has a 15.00 m span length. The bridge was loaded by the German ICE-3 high-speed train moving at the critical (180 and 270 km/h) and the maximum (300 km/h) operating speeds.

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