Abstract
When the high-speed railway traffic is being organized, it becomes necessary to elaborate bridge design standards for high-speed railways. To ensure safety of traffic and reliability of bridges one needs to resolve the dynamic problems of various types of high-speed trains moving along the structures. The article analyzes the magnitude of inertial response as the function of the external stress parameters. A simplified structure assessment technique is offered based on the criterion of passenger comfort while crossing the bridges. The usefulness of the given research arises from the reduction of complexity of the complicated dynamic calculations needed to describe a high-speed train travelling along the artificial structures. Dependences of relative elastic deflection values from the span length are proposed, which allows designing and calculating long-span structures using the simplified dynamic models.
Highlights
One of the main peculiarities of bridge design on high-speed railways (HSR) is an obligatory requirement to account for the dynamic interaction of the high-speed rolling stock and the bridge structure
Specificity of the rolling stock power load on the bridge structure is due to the so called speed effect of kinematic excitation, which means that the temporary power action caused by the bridge live load is transferred to the bridge superstructure via the wheel sets of the rolling stock
This paper considers more than 50 m long spans and proposes calculations of the ‘bridge-train’ system dynamic interaction for Velaro RUS (“Sapsan”) high-speed train passing along bridge structures
Summary
One of the main peculiarities of bridge design on high-speed railways (HSR) is an obligatory requirement to account for the dynamic interaction of the high-speed rolling stock and the bridge structure. Unlike it is provided by the existing Russian standards, where the dynamic interactions in the ‘bridge-train’ system are calculated using a system of coefficients (a quasistatic model), at high-speed traffic the dynamic interaction factor should be accounted for by performing a dynamic task [1, 2, 3]. While operating a HSR bridge, the speed effect can cause a condition of resonance and lead to dangerous vibrations of the bridge structures This occurs in case the period of train power action coincides with the main period of the bridge superstructure self-induced vertical vibrations [3]. The bridge elements, and they exert an unfavourable influence on the stability of the bridge deck and passenger comfort
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