Abstract
AbstractThe development of materials engineering has facilitated the design of slender, light bridges replacing standard construction materials with others, which fulfil their purpose both in terms of structural behaviour and safety. This article focuses on the presentation of the problems related to the modelling of bridges and their loads modelling train passages, as well as an analysis of the influence of load parameters on the dynamic response of a structure. The problem has become essential with the development of materials engineering which enabled the design of slender and light bridges according to the assumptions of sustainable development. The article contains a number of numerical analyses which allowed the verification of the developed finite element bridge model (frame and plate-frame types) in terms of the possibility of using them at the design stage. The load was modelled as a system of concentrated forces, the so-called moving load (ML) model. The results obtained from theoretical analyses were compared within situmeasurements of the existing bridge subjected to the load variable in time (set of locomotives ST43 and ST45 and locomotive EP09). It has been found that in dynamic analysis, modelling of the load is essential. A simplified load model such as ML can be used when displacement values are the only results analysed in detail. ML and finite element plate and frame models give high accordance of the displacement results.
Highlights
The development of materials engineering has facilitated the design of slender, light bridges replacing standard construction materials with others, which fulfil their purpose both in terms of structural behaviour and safety
The compatibility of theoretical results with the deflection values of the bridge plate was satisfactory for both the locomotive set ST43–ST45 as well as for the locomotive EP09
Finite element plate-frame model demonstrated higher accuracy in comparison to the ones obtained for the frame model
Summary
Abstract: The development of materials engineering has facilitated the design of slender, light bridges replacing standard construction materials with others, which fulfil their purpose both in terms of structural behaviour and safety. The authors of refs [10,11] presented a method of wind load modelling with regard to a train travelling at high speed In such cases, lateral wind pressure plays a key role. There are works related to dynamic analyses considering the passage of high-speed trains, where the load has been described by more complex models e.g. train-bridge dynamic interaction model [15]. This model is based on the multi-body system dynamics theory to simulate a train subsystem. This article focuses on the presentation of the problems related to the modelling of bridges and their loads modelling train passages, as well as an analysis of the influence of load parameters on the dynamic response of a structure
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