Abstract
This paper discusses some issues related to dynamic effects in railway bridges focussed on the simulation of the resonant vibration for the small and medium span simply supported railway bridges subjected to a series of moving vehicle. Presented parametric study is concerned with the dynamic deflection of the simply supported railway truss bridge of the span Lb = 38 m, due to the series of the ten moving loads representing a conventional train with the IC-coaches employed in Slovakia, with the impact to the resonance speed c2res = 65.03 m/s = 234.11 km/h. The deflection amplitude (c2 = 33)w(1),(P1,P2....PN)(Lb / 2,t) increase with an increasing number of load forces n = 1, 2, ... N forces moving along the bridge.
Highlights
The dynamic response of railway bridges, subjected to moving trains is influenced by a number of factors such as the speed of load, the bridge span, natural frequencies of the bridge and railways vehicles, the inertia and damping of the two interaction systems, the distance between the vehicles, and arranging axles of vehicles
This paper discusses some issues related to dynamic effects in railway bridges focussed on the simulation of the resonant vibration for the small and medium span supported railway bridges subjected to a series of moving vehicle
^a + 2h ^1h,^P1,P2,fP10h b due to the series of load IC-cars (P1+P2+...P10) is defined by superposition of the quasi-static and the dynamic components described by expressions (11), (12) and (14)
Summary
The dynamic response of railway bridges, subjected to moving trains is influenced by a number of factors such as the speed of load, the bridge span, natural frequencies of the bridge and railways vehicles, the inertia and damping of the two interaction systems (vehicles and the bridge), the distance between the vehicles, and arranging axles of vehicles. One of the actual problems is the solution of the dynamic behaviour of the bridge subjected to a series of identical loads. In this paper the dynamic behaviour of the supported railway bridge with the span Lb = 38 m, subjected to the successive identical moving loads is solved. Consider a supported beam (without damping) subjected to a series of concentrated constant loads P, which are moving at a uniform speed c, in the meaning of Fig. 2. When the first and last moving load on the bridge span be P1 and PM at a time t, Equation (1) can be expressed in terms of the generalized coordinates as. - is the circular driving frequency of the moving force for the j-th mode of vibration
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