Ballastless track self-compacting concrete fatigue damage calculation method

Abstract

The invention provides a ballastless track self-compacting concrete fatigue damage calculation method, and belongs to the technical field of track traffic. The method comprises the following steps: constructing a self-compacting concrete fatigue constitutive relational expression coupled with damage; embedding the self-compacting concrete fatigue constitutive relation coupled with the damage into the load-ballastless track nonlinear finite element model to construct a damage-finite element coupling model; and analyzing the fatigue damage evolution law of the self-compacting concrete layer of the ballastless track by using the damage-finite element coupling model. According to the method, the coupling relation between fatigue damage and structural stress is revealed through a coupling method, the limitation that the structural stress does not change along with damage accumulation in a traditional decoupling method is overcome, and the influences of train load changes, plate end open joints and initial degradation of self-compacting concrete on the fatigue damage of the ballastless track filling layer are explored; and a certain theoretical support is provided for the long-term service performance research of the ballastless track of the high-speed railway according to the influence rule of fatigue damage accumulation on the bending-tensile stress.

Description

technical field [0001] The invention belongs to the technical field of rail transit, and in particular relates to a method for calculating the fatigue damage of self-compacting concrete of a ballastless track. Background technique [0002] With the rapid development of my country's high-speed railway technology, by the end of 2020, China's high-speed rail operating mileage has exceeded 38,000 kilometers, and the ballastless track operating mileage has reached 22,000 kilometers, ranking first in the world. As one of the core technologies of high-speed railways and passenger-dedicated lines, ballastless track has become an important infrastructure to guide and support the operation of high-speed trains due to its advantages of high ride comfort, high stability and less maintenance. Adopt ballastless track. [0003] Under the combined action of repeated train loads and complex service environment, the ballastless track structure is prone to fatigue failure. As a track structu...

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Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the present invention provides a fatigue damage calculation method for ballastless track self-compacting concrete, which solves the problem that the influence of damage accumulation on the stress state of self-compacting concrete is not considered, and can more truly reflect self-compacting Variation law of stress distribution of concrete layer with damage accumulation during service

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