Abstract
The paper presents the results of dynamic analysis of the small-span railway bridge, subjected to an action of moving trains. Numerical simulations were performed using three different load models: series of moving forces, series of moving single-mass and double-mass oscillators. The parameters of the vehicle were taken from the existing EN57 train. The parameters of the bridge were taken from the existing steel span of 10,24 m long. In both cases, the dynamic parameters were identified based on free-response measurements using modal identification techniques. Vibrations of the midpoint of the bridge as well as the mass of the oscillator have been analyzed. Numerical results obtained for individual load models were compared with the results of in-situ tests performed under operating conditions.
Highlights
In 1829 the George Stephenson’s ‘Rocket’ locomotive was presented
The bridge-vehicle dynamic interaction is considered in the paper
Field measurements were conducted in operating conditions for response data collection and system identification
Summary
In 1829 the George Stephenson’s ‘Rocket’ locomotive was presented. A one year later, in 1830, the first steamonly railway line was opened between Liverpool and Manchester. The first attempts to describe the problem were presented by Krylov and Timoshenko [1, 2] They considered a single force model moving on the Euler-Bernoulli beam with a constant speed. The higher train speed, the greater dynamic impact to a bridge For this reason, bridge-vehicle interaction has become an important part of design and research work, for high-speed railways. A typical train consists of the sequence of locomotives and carriages which causes the cyclic excitations It was simulated by developing the single load models into the series of loads [12,13,14]. The more complex model, the more parameters must be determined For this reason, in the case of technical requirements, the dynamic effects of loads are simplified very often [21,22,23,24]. Numerical results of the train passing the bridge were referred to the field measurements performed under operating conditions
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