Ballastless track damage analysis method performing combined solution based on definite element expansion and fatigue analysis

Abstract

The invention discloses a ballastless track damage analysis method performing combined solution based on definite element expansion and fatigue analysis. The method includes the following steps that a definite element model of a ballastless track is built; needed loads and boundary conditions are applied to the definite element model, and stress analysis is performed on the definite element model; a stress analysis result is imported into fatigue analysis software, and fatigue performance analysis of the definite element model is performed; based on a definite element expansion method, fracture mechanics parameters of materials of the track structure are defined in the definite element model, service life critical portions obtained during fatigue performance analysis are selected as damaged regions, and generation of damage and a continuous development evolution rule are calculated; a train wheel track coupling model is added on the definite element model, damage is applied to the truck structure, the transverse acceleration, the vertical acceleration, the derailment coefficient and the wheel weigh load reducing rate of a train are calculated after the damage happens to the track structure, and influences of the damage on running of the train are analyzed.

Description

technical field [0001] The invention relates to a disease analysis method for ballastless tracks of high-speed railways. More specifically, it relates to a ballastless track disease analysis method based on joint solution of extended finite element and fatigue analysis. Background technique [0002] Since the 1860s, the ballastless track structure of high-speed railways has been developed and gradually widely used in Germany, Japan, the United Kingdom, Italy and other countries. From shallow to deep, from single to multiple varieties, and from bridge and tunnel to soil roadbed in terms of laying scope. At present, most countries with relatively developed high-speed railways use ballastless track as the main track structure type. [0003] With the operation, various damages and diseases of ballastless track appear continuously, and the types of diseases also develop in diversification. The diseases of ballastless track are divided from the development part: ballastless tra...

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Problems solved by technology

[0004] At present, the analysis methods for ballastless track defects mainly use the finite element method for stress analysis, and fatigue analysis software is also used for life prediction, or indoor testing, but these analysis methods have obvious limitations, such as the finite element method is difficult Analyzing discontinuity problems such as cracks, separation, and arching of track slabs, fatigue analysis is difficult to combine with mechanical analysis results, and experimental research requires a lot of financial support

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