Simplified design method for continuously-welded rail of ballastless track of ultra-large bridge of railway

Abstract

The invention discloses a simplified design method for a continuously-welded rail of a ballastless track of an ultra-large bridge of a railway. The method comprises the steps of: S1, utilizing ANSYS software to perform analog simulation on the continuously-welded rail structure on the ultra-large bridge; S2, establishing a horizontal and vertical space coupling static model for the continuously-welded rail of the ballastless track of the ultra-large bridge of the railway, wherein modeling objects include a steel rail, a fastener, a track board, an elastic rubber pad layer, a limiting boss, a bridge and a pier; and S3, performing static analysis on the coupling static model. According to the technical scheme, on the basis of the simplified design method, static force of a continuously-welded rail-ballastless track-ultra-large bridge system of the railway can be accurately and effectively analyzed, relation of interaction between girders and rails is fully considered, modeling of the track structure is finished according to an actual state as far as possible, a computing model is simplified on the premise of ensuring the model to be fine, complete and accurate, and remarkable improvements are achieved in design in comparison with a conventional modeling method.

Description

technical field [0001] The invention relates to the field of railway engineering design, in particular to a simplified design method for a ballastless track seamless track of a super-large railway bridge. Background technique [0002] With the development of urban rail transit and the limitation of space resources, the need for road and railway dual-use bridges was gradually raised during the design process. Therefore, when the railway bridge crosses a large river, not only the span of the bridge is required to be large enough, but also the bridge deck is required to be wide enough, that is, there have been extra-long-span bridges, such as the Dashengguan Yangtze River Bridge in Nanjing, and the extra-large span across the Dongping Waterway in Nanhai District, Foshan City. bridge etc. [0003] Whether it is a high-speed railway or an urban rail transit line, in the design process of a super-large bridge, it is necessary to check the strength and stability of the seamless li...

AI Technical Summary

Problems solved by technology

However, when the span is particularly large and the bridge deck is particularly wide, because some detailed structures of the track system (such as limiting bosses) are too small compared with the width of the bridge deck, although the simulation results using 3D solid elements are relatively accurate, However, there are too many units in the model structure, which leads to the calculation model being too large and the calculation speed too slow, which is not conducive to fast detection and calculation.

If the two-dimensional calculation model is used, although the number of elements in the model is greatly reduced and the calculation speed is greatly accelerated, it is difficult to reflect the interaction between beams and rails well due to the simplification of the two-dimensional model, so the calculation results are consistent with actual difference

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