Fatigue stress spectrum analysis method and system of longitudinally connected ballastless track on bridge

Abstract

The invention discloses a fatigue stress spectrum analysis method and system of a longitudinally connected ballastless track on a bridge for improving the simulation accuracy of the fatigue stress spectrum of the longitudinally connected ballastless track on the bridge during service and providing important support for the fatigue design of the longitudinally connected ballastless track on the bridge. The method comprises the following steps: independently establishing a longitudinally connected ballastless track-bridge temperature field calculation model, a high speed train-longitudinally connected ballastless track-bridge three-dimensional finite element coupling dynamics model and a longitudinally connected ballastless track-bridge-bridge abutment longitudinal interaction model; utilizing the models to research the stress time travel curve and the fatigue stress spectrum of the longitudinally connected ballastless track on the bridge during the service under the composite actions of loads including a train vertical load, a train longitudinal load, a ballastless track concrete temperature load, a ballastless track concrete temperature gradient load, a ballastless track concrete contraction load, a ballastless track prestress load and the like. The mechanical model of the invention is finer, and a load model is more perfect.

Description

technical field [0001] The invention relates to the technical field of railway engineering application calculation and design, in particular to a fatigue stress spectrum analysis method and system for longitudinally connected slab ballastless tracks on bridges. Background technique [0002] Longitudinal slab-type ballastless track on the bridge is a main type of ballastless track structure on high-speed railway bridges in my country, and has been applied on many passenger dedicated lines including the Beijing-Shanghai high-speed railway. Compared with ballastless track on other types of bridges, the longitudinal slab ballastless track on the bridge has many advantages: by setting false joints in the track slab, the position where cracks appear in the ballastless track can be effectively controlled; Grinding the slab can reduce the fine adjustment of the line and effectively improve the smoothness of the high-speed railway line; by setting a sliding layer between the ballastl...

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Problems solved by technology

[0004] With the widespread application of longitudinally connected slab ballastless tracks on bridges in my country's high-speed railways, some domestic scholars have conducted some research on the mechanical properties of bridge longitudinally connected slab ballastless tracks, but most of the research is on bridges under longitudinal loads. Longitudinal mechanical characteristics of longitudinally connected slab ballastless track, temperature field of longitudinally connected slab ballastless track on the bridge and its warping deformation and interlayer separation, stability of longitudinally connected slab ballastless track on bridge and train-longitudinal slab ballastless track Ballast track-bridge coupling dynamic characteristics, although there have been some studies on the fatigue characteristics of the longitudinal slab ballastless track on the bridge, but the research is not deep enough. For example, as an important part of the research on the fatigue characteristics of the Most studies on the fatigue stress spectrum of the upper longitudinal slab ballastless track do not consider the time-varying characteristics and combined effects of loads during service, nor do they consider some loads that have an important impact on the mechanical properties of the longitudinal slab ballastless track on the bridge, such as the train system. Dynamic and traction loads, shrinkage loads of ballastless track concrete, and temperature loads of ballastless track, there are still great deficiencies in the research

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