Abstract
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.
Highlights
Moving-load as a dynamic problem is very common in science papers because of many structures subjected to loads which move in space, for example Fryba’s monograph described a lot of moving-load problems and their analytic solutions [1]
The study presents the impact factors in the longitudinal normal stress in the bottom fibres of main steel beams at the midspan which were obtained in dynamic analysis of the BTT systems
This study presents the comparison of impact factors for track irregularities TI4, TI5 of five bridges from steel-concrete bridges (SCB)
Summary
Moving-load as a dynamic problem is very common in science papers because of many structures subjected to loads which move in space, for example Fryba’s monograph described a lot of moving-load problems and their analytic solutions [1]. The literature studies confirmed that one of the main factors affecting the dynamic response of railway engineering structures are irregularities in the railway surface - track irregularities [2,3,4,5,6,7,8,9,10,11,12]. Experimental measurements and modelling of track irregularities are considered in a number of papers, e.g. A common model of railway track vertical irregularities is a stationary and ergodic Gaussian process in space [4,10,11,12]
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