CN108647446B - Method and system for analyzing injury of passenger-cargo collinear double-block ballastless track - Google Patents
Method and system for analyzing injury of passenger-cargo collinear double-block ballastless track Download PDFInfo
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Abstract
The invention discloses a method and a system for analyzing the damage of a passenger-cargo collinear double-block ballastless track, which are used for analyzing and researching the damage of the ballastless track. The method comprises the following steps: the main structural characteristics and the material form of the passenger-cargo collinear double-block ballastless track are determined; obtaining plastic damage constitutive relation of each component material of the ballastless track based on specifications, documents and tests; calculating plastic damage parameters required by building a coupling model; establishing the accuracy of reverse verification parameters of a test block simulation model by combining finite element software; assigning parameters to the coupling model; and carrying out subsequent simulation calculation and damage analysis based on the coupling model. The method and the system fully consider the characteristics of passenger-cargo collinear lines, successfully apply the concrete plastic damage constitutive theory to the nonlinear analysis of the railway ballastless track by combining a finite element method, fill the blank of the passenger-cargo collinear double-block ballastless track damage analysis theoretical model, and have the advantages of universality, easiness in realization, high accuracy, visual and understandable damage analysis indexes and the like.
Description
Technical Field
The invention relates to the field of passenger-cargo collineation ballastless tracks, in particular to a method and a system for analyzing the injury of a passenger-cargo collineation double-block ballastless track.
Background
Railways always play a leading role in transportation in China, bear nearly 70% of freight traffic and 60% of passenger traffic in China, and are in overload transportation states for a long time. In order to relieve railway transportation pressure, the product in China can improve the speed of the existing line in a large area and simultaneously construct a large number of passenger special lines. After the acceleration transformation of part of existing lines is finished and at the initial stage of operation of the special passenger lines, passenger-cargo collineation mode transportation is adopted. Besides the comprehensive test section of the ballast-free track of the passenger-cargo line, the ballast-free track is generally adopted for the positive line of the passenger-cargo line in China, and the ballast-free track is adopted for the conditional tunnel and bridge sections.
The ballastless track for passenger and cargo collinear transportation is mainly of a ballastless track structure type mainly comprising double-block type, sleeper embedded type and under-track elastic supporting mode. Because the axle weights, the running speeds and the dynamics of the passenger cars and the trucks are different, the ballast bed plates in the tunnels are rigidly connected with the lower inverted arch or the foundation, so that the influence of freight rolling stock on the disturbance of the ballastless track is more complex, the damage and the damage of the ballastless track sleeper and the ballast bed plates are further aggravated, the smoothness and the evolution rule of the ballastless track are influenced, and the safety of passenger and cargo transportation is greatly influenced.
At present, the damage and destruction research of ballastless tracks is mostly based on a linear elastic analysis model, and the track structure defect generation mechanism and the influence thereof on the performance of a vehicle track system are simulated by presetting geometrical defects of the track structure or adopting nonlinear failure springs and other means. The existing research also has the research on the damage and disease mechanism of the ballastless track based on an extended finite element method, a cohesive force model and the like, but the existing research has certain defects. If the extended finite element method is based on fracture mechanics, a simulation means for mainly researching crack generation and development cannot reflect the microscopic damage process before the generation of a macroscopic crack, and the initial crack is often required to be preset, so that the randomness of the generation of diseases cannot be reflected; the cohesive force model is mainly researched aiming at interlayer damage and destruction, and has stronger pertinence. In view of the fact that the load action form and the damage characteristic of the passenger-cargo collinear double-block ballastless track are more complex, a nonlinear analysis model which is applicable to passenger-cargo collineation and can comprehensively consider random damage and damage of the ballastless track is urgently needed to be established, so that the damage analysis requirement of the passenger-cargo collineation ballastless track is met.
The patent provides a method and a system suitable for analyzing the damage of the passenger-cargo collineation double-block ballastless track, the method and the system fully consider the characteristics of the passenger-cargo collineation line and the elastoplastic damage constitutive relation of each component material of the double-block ballastless track, can accurately reflect the nonlinearity and random damage characteristics of each material of the ballastless track, can comprehensively and effectively research the random damage, accumulation and evolution rules of the ballastless track bed board, the supporting layer, the bridge and the tunnel part structure, and can provide theoretical support for the service state and maintenance technical research of the passenger-cargo collineation ballastless track structure. The method and the system can be used for static damage analysis and dynamic damage analysis, and have the advantages of universality, easiness in realization, high accuracy, visual and understandable damage analysis indexes and the like.
Disclosure of Invention
The invention aims to provide a method for analyzing the damage of the passenger-cargo collinear double-block ballastless track, and the other aim of the invention is to provide a system for analyzing the damage of the passenger-cargo collinear double-block ballastless track, so as to solve the problem that a branching analysis model in the prior art cannot comprehensively consider the random damage and damage of the ballastless track.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention discloses a method for analyzing the damage of passenger-cargo collinear double-block ballastless tracks, which comprises the following steps of
Determining the main body structure and materials of the passenger-cargo collinear rail, and obtaining a plastic damage constitutive relation according to the specification and the test;
Calculating to obtain plastic damage parameters according to the plastic damage constitutive relation;
establishing a space coupling model of the double-block ballastless track;
Substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain the space coupling model of the passenger-cargo collinear double-block ballastless track;
And performing damage analysis and calculation by using the obtained passenger-cargo collinear double-block ballastless track space coupling model.
Preferably, the double-block ballastless track space coupling model comprises a first space coupling model and/or a second space coupling model,
The first space coupling model is obtained by carrying out static damage analysis on a component model of the double-block ballastless track to determine passenger-cargo collineation load parameters; and establishing a whole bus and truck model by carrying out dynamic damage analysis on the component model of the double-block ballastless track so as to obtain the second space coupling model.
Preferably, the component model is a model for rails, ties, connecting parts, ballast and switches based on the body structure and the material form.
Preferably, the main structure comprises two types of double-block ballastless tracks in the tunnel and double-block ballastless tracks on the bridge, and the material comprises a double-block ballastless track bed board, a supporting layer, a tunnel and a bridge.
Preferably, the plastic damage parameters include corresponding data columns of tensile stress-inelastic strain, compressive stress-inelastic strain, tensile damage factor-inelastic strain, and compressive damage factor-inelastic strain.
Preferably, the damage analysis includes tension damage analysis, compression damage analysis, total stiffness damage analysis and plastic strain analysis.
Preferably, the parameters substituted into the space coupling model of the double-block ballastless track further comprise density, elastic modulus and poisson ratio.
Preferably, the calculating the plastic damage parameter according to the plastic damage constitutive relation specifically includes: building a test block simulation model, checking the plastic damage parameters,
If the plastic damage parameters are correct, substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain a space coupling model of the passenger-cargo collineation double-block ballastless track; if the plastic damage parameters are wrong, the parameters are redetermined for verification;
wherein the test block simulation model geometry is consistent with the specification of the strength test related specification.
The invention also discloses a system for analyzing the damage of the passenger-cargo collinear double-block ballastless track, which comprises
The plastic damage parameter determining module is used for determining the main body structure and materials of the passenger-cargo collinear rail, obtaining a plastic damage constitutive relation according to the specification and the experiment, and calculating to obtain plastic damage parameters;
The modeling module is used for establishing a double-block ballastless track space coupling model, and substituting the plastic damage parameters into the double-block ballastless track space coupling model to obtain a passenger-cargo collineation double-block ballastless track space coupling model;
And the damage analysis module is used for carrying out damage analysis and calculation by using the obtained passenger-cargo collinear double-block ballastless track space coupling model.
Preferably, the plastic damage parameter determining module is further configured to establish a test block simulation model, verify the plastic damage parameter,
If the plastic damage parameters are correct, substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain a space coupling model of the passenger-cargo collineation double-block ballastless track; if the plastic damage parameters are wrong, the parameters are redetermined for verification;
wherein the test block simulation model geometry is consistent with the specification of the strength test related specification.
Preferably, the space coupling model of the double-block ballastless track established in the modeling module comprises a first space coupling model and a second space coupling model,
The first space coupling model is obtained by performing static damage analysis on a component model of the double-block ballastless track to determine passenger-cargo collineation load parameters; the second space coupling model is obtained by establishing a whole car model of the passenger car and the truck through dynamic damage analysis on a part model of the double-block ballastless track.
Preferably, the component model is a model for rails, ties, connecting parts, ballast and switches based on the body structure and the material form.
Preferably, the main structure comprises two types of double-block ballastless tracks in a tunnel and double-block ballastless tracks on a bridge, and the material comprises a double-block ballastless track bed board, a supporting layer, a tunnel and a bridge.
Preferably, the plastic damage parameters include four sets of corresponding data columns of tensile stress-inelastic strain, compressive stress-inelastic strain, tensile damage factor-inelastic strain, compressive damage factor-inelastic strain.
Preferably, the damage analysis includes tension damage analysis, compression damage analysis, total stiffness damage analysis, and plastic strain analysis.
Preferably, the parameters of the space coupling model of the double-block ballastless track are substituted into the modeling module, and the parameters further comprise density, elastic modulus and poisson ratio.
The beneficial effects of the invention are as follows:
The invention provides a method and a system for analyzing the damage of a passenger-cargo collinear double-block ballastless track, which can be used for analyzing static damage and vehicle track coupling power damage. The method and the system can comprehensively consider the nonlinear effect and random damage accumulation characteristic of each component material of the double-block ballastless track, break through the limitation that the line elastic model cannot consider accumulated plastic deformation and random damage of the material in the traditional finite element analysis method, fill the blank of the passenger-cargo collinear double-block ballastless track damage analysis theoretical model, and simultaneously can be used for other types of ballastless tracks, and have the advantages of universality, easiness in realization, high accuracy, visual and easily understood damage analysis indexes and the like.
Drawings
The following describes the embodiments of the present invention in further detail with reference to the drawings.
FIG. 1 shows a flow chart of a method for analyzing the damage of a passenger-cargo collinear double-block ballastless track;
FIG. 2 is a graph showing the constitutive relation of materials in the present embodiment;
FIG. 3 shows a graph of plastic damage parameters of a material in the present example;
FIG. 4 shows a finite element model diagram of a dual block ballastless track in this embodiment;
fig. 5 shows a finite element model of a passenger car in the present embodiment;
FIG. 6 shows a finite element model of a truck in this embodiment;
Fig. 7 shows an applied displacement load map in the present embodiment;
FIG. 8 shows a finite element model diagram of in-tunnel vehicle track coupling dynamics in this embodiment;
fig. 9 shows a dual block ballastless track slab damage analysis cloud chart in the present embodiment;
FIG. 10 shows a schematic diagram of a system for analyzing the damage of a passenger-cargo collinear double-block ballastless track.
Detailed Description
In order to more clearly illustrate the present invention, the present invention will be further described with reference to preferred embodiments and the accompanying drawings. Like parts in the drawings are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and that this invention is not limited to the details given herein.
Based on the concrete plastic damage constitutive theory and combined with a finite element method, the invention establishes a nonlinear analysis model which can comprehensively consider the elastoplastic damage constitutive relation of each component material of the double-block ballastless track, so as to be used for researching the state evolution rule of the passenger-cargo collinear ballastless track components.
As shown in fig. 1, the method for analyzing the damage of the passenger-cargo collinear double-block ballastless track is provided by the invention. According to the actual condition of the track system on site, the main structure and material form of the passenger-cargo collinear double-block ballastless track are defined, the main structure comprises a track bed plate, supporting layer composition materials and the like, and the geometric dimension of the track structure and the conventional physical properties of part of materials are actually measured.
Referring to existing specifications, documents and material tensile and compression tests, the elastoplastic damage constitutive relation of each component material of the ballastless track is deduced, and a graph of constitutive relation of the material being a track bed board in one embodiment is shown in fig. 2.
Based on the constitutive relation, calculating plastic damage parameters required for building a ballastless track finite element entity model, wherein the plastic damage parameters comprise corresponding data columns such as tensile stress-inelastic strain, compressive stress-inelastic strain, tensile damage factor-inelastic strain, compressive damage factor-inelastic strain and the like of a material, and the corresponding relation of four groups of corresponding data columns of the plastic damage parameters is shown in fig. 3.
And carrying out a test block simulation model compression test on the obtained plastic damage parameters to verify the accuracy of the parameters, and simultaneously, testing and adjusting other parameters in the damage model. If the plastic damage parameters are correct, substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain a space coupling model of the passenger-cargo collineation double-block ballastless track; if the plastic damage parameters are wrong, the parameters are redetermined for verification; wherein the test block simulation model geometry is consistent with the specification of the strength test related specification.
According to the field situation, determining the main structure type of the ballastless track, determining the geometric dimension of the ballastless track structure and the conventional physical properties of materials, and establishing a double-block ballastless track space entity refined analysis model by adopting ABAQUS finite element software, namely establishing each part model of the double-block ballastless track, wherein the part models comprise finite element models established for each part such as a steel rail, a sleeper, a connecting part, a railway bed, a turnout and the like. And a finite element model diagram of the double-block ballastless track is shown in fig. 4.
As shown in fig. 5 and 6, because the axle weights, the running speeds and the dynamics characteristics of the passenger car and the freight car are different, in order to fully consider the characteristics of collineation of the passenger car and the freight car, the whole car model of the passenger car and the freight car can be built by a real ruler, so that the space coupling dynamics model of the passenger car/freight car and the double-block ballastless track can be built, namely, the whole car model of the passenger car and the whole car model of the freight car can be built based on building the models of all parts of the double-block ballastless track and carrying out the analysis of the power injury; as shown in fig. 7, in order to fully consider the characteristics of passenger and cargo collineation, the load spectrum of a passenger car or a freight car can be applied to the static analysis model, the load spectrum can be a displacement spectrum or a force spectrum, the load can be applied singly or applied in an alternating or cyclic manner, namely, based on building a model of each component of the double-block ballastless track, and carrying out static damage analysis to determine passenger and cargo collineation load parameters. When the load parameters are obtained, the running characteristics of the passenger car and the freight car and the respective vehicle types are determined according to the on-site operation condition, and related documents are referred to obtain the vehicle parameters required by building the whole finite element model of the passenger car and the freight car or the load parameters generated by the passenger car and the freight car on the lower structure. The vehicle parameters comprise geometric parameters and mechanical parameters of the vehicle, and the load parameters can be a force spectrum, a displacement spectrum and the like.
And establishing a first space coupling model based on the determined passenger-cargo collineation load parameters, establishing a second space coupling model based on the established passenger-cargo vehicle model/truck vehicle model, and forming a basic double-block ballastless track space coupling model by the first space coupling model and the second space coupling model.
Substituting the verified plastic damage parameters meeting the requirements into the space coupling model of the double-block ballastless track, wherein the parameters of the space coupling model of the double-block ballastless track also comprise density, elastic modulus, poisson ratio, thermal expansion coefficient and the like, so that the space coupling model suitable for the damage analysis of the passenger-cargo collinear double-block ballastless track is obtained, and the space coupling model comprises the space coupling model for the damage analysis of the first passenger-cargo collinear double-block ballastless track and the space coupling model for the damage analysis of the second passenger-cargo collinear double-block ballastless track.
The space coupling model of the first cargo collineation double-block ballastless track can be obtained based on static analysis, so that injuries can be rapidly analyzed; the space coupling model of the second passenger-cargo collinear double-block ballastless track is obtained based on dynamic analysis, and can have higher accuracy and accuracy for injury analysis. Based on the space coupling model formed by the two, which is suitable for the damage analysis of the passenger-cargo collinear double-block ballastless track, the efficiency and the accuracy can be further improved, and the method has profound significance for the damage analysis of the ballastless track. As shown in FIG. 8, the model is a space coupling model suitable for analyzing the damage of the passenger-cargo collinear double-block ballastless track, and can fully consider the nonlinear effect and random damage accumulation characteristic of each component material of the ballastless track, and simultaneously fully consider the functions and actions of each component part of the coupling model.
And carrying out subsequent ballastless track simulation calculation and damage analysis by using the obtained model, and carrying out finite element simulation calculation based on the established space coupling model suitable for passenger-cargo collinear double-block ballastless track damage analysis, thereby carrying out subsequent ballastless track damage theoretical analysis research.
As shown in fig. 9, the damage cloud pictures of the road bed board under the action of the vertical load of the train comprise a total rigidity damage cloud picture, a tension damage cloud picture and a compression damage cloud picture. According to the cloud pictures, when the vertical load of the train is large, the peripheral area of the sleeper on the upper surface of the railway bed plate is damaged, and the tensile damage is far greater than the compression damage.
Therefore, the model is more consistent with the actual situation on site when analyzing the occurrence, development and evolution rules of the ballastless track damage, and can be effectively used for analyzing the damage of the passenger-cargo collinear double-block ballastless track.
Further, based on the method, the space coupling model for the passenger-cargo collinear double-block ballastless track damage analysis comprises a first passenger-cargo collinear double-block ballastless track damage analysis space coupling model and a second passenger-cargo collinear double-block ballastless track damage analysis space coupling model, wherein the first passenger-cargo collinear double-block ballastless track damage analysis space coupling model is used for carrying out tension damage analysis, compression damage analysis, total rigidity damage analysis and plastic strain analysis; the second passenger-cargo collinear double-block ballastless track injury analysis space coupling model is used for carrying out tension injury analysis, compression injury analysis, total rigidity injury analysis and plastic strain analysis. Therefore, the two can simultaneously carry out damage analysis, and the accuracy can be further improved while the efficiency is improved. In the method for analyzing the damage of the passenger-cargo collinear double-block ballastless track, only one of the first passenger-cargo collinear double-block ballastless track damage analysis space coupling model and the second passenger-cargo collinear double-block ballastless track damage analysis space coupling model can be established, so that the track damage analysis and calculation can be completed.
Based on the above method, as shown in fig. 10, the invention provides a system for analyzing the damage of a passenger-cargo collinear double-block ballastless track, which comprises a plastic damage parameter determining module 10, a plastic damage cost relationship determining module and a plastic damage parameter calculating module, wherein the plastic damage parameter determining module is used for determining the main structure and the material of the passenger-cargo collinear track, and obtaining the plastic damage cost relationship according to the specification and the experiment; the modeling module 11 is used for establishing a double-block type ballastless track space coupling model, and substituting the plastic damage parameters into the double-block type ballastless track space coupling model to obtain a passenger-cargo collineation double-block type ballastless track space coupling model; the damage analysis module 12 performs damage analysis and calculation by using the obtained passenger-cargo collinear double-block ballastless track space coupling model.
The plastic damage parameter determining module is further used for establishing a test block simulation model, verifying the plastic damage parameters, and substituting the plastic damage parameters into the double-block ballastless track space coupling model to obtain a passenger-cargo collineation double-block ballastless track space coupling model if the plastic damage parameters are correct; if the plastic damage parameters are wrong, the parameters are redetermined for verification; the geometric dimension of the test block simulation model is consistent with the specification related to the strength test. The plastic damage parameters comprise four groups of corresponding data columns of tensile stress-inelastic strain, compressive stress-inelastic strain, tensile damage factor-inelastic strain and compressive damage factor-inelastic strain.
In the above embodiment, the space coupling model of the dual-block ballastless track established by the modeling module includes a first space coupling model and a second space coupling model, where the first space coupling model is obtained by performing static damage analysis on a component model of the dual-block ballastless track to determine a passenger-cargo collineation load parameter; the second space coupling model is obtained by establishing a whole car model of the passenger car and the truck through dynamic damage analysis on a part model of the double-block ballastless track.
The component model is a model which is established based on the main body structure and the material form and relates to a steel rail, a sleeper, connecting parts, a track bed and a turnout, wherein the main body structure comprises two types of double-block ballastless tracks in a tunnel and double-block ballastless tracks on a bridge, and the material comprises double-block ballastless track bed boards, supporting layers, tunnels and bridge constituent materials; parameters substituted into the space coupling model of the double-block ballastless track further comprise density, elastic modulus and poisson ratio.
In the damage analysis module, the damage analysis comprises tension damage analysis, compression damage analysis, total stiffness damage analysis and plastic strain analysis.
Furthermore, in the method or the system for analyzing the damage of the passenger-cargo collinear double-block ballastless track, only one of the first passenger-cargo collinear double-block ballastless track damage analysis space coupling model and the second passenger-cargo collinear double-block ballastless track damage analysis space coupling model can be established, so that the track damage analysis and calculation can be completed.
It should be understood that the foregoing examples of the present invention are provided merely for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (4)
1. A method for analyzing the damage of a passenger-cargo collinear double-block ballastless track is characterized by comprising the following steps of
Determining the main body structure and the material form of the passenger-cargo collinear rail, and obtaining a plastic damage constitutive relation according to the specification and the test;
Calculating to obtain plastic damage parameters according to the plastic damage constitutive relation;
establishing a space coupling model of the double-block ballastless track;
Substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain the space coupling model of the passenger-cargo collinear double-block ballastless track;
Performing damage analysis and calculation by using the obtained passenger-cargo collinear double-block ballastless track space coupling model;
The plastic damage parameters comprise corresponding data columns of tensile stress-inelastic strain, compressive stress-inelastic strain, tensile damage factor-inelastic strain and compressive damage factor-inelastic strain;
the calculation of the plastic damage parameters through the plastic damage constitutive relation specifically comprises the following steps:
establishing a test block simulation model, verifying the plastic damage parameters,
Substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain the space coupling model of the passenger-cargo collineation double-block ballastless track if the plastic damage parameters are correct;
If the plastic damage parameters are wrong, the parameters are redetermined for verification;
wherein the geometric dimension of the test block simulation model is consistent with the specification related to the strength test;
the main structure comprises two types of double-block ballastless tracks in a tunnel and double-block ballastless tracks on a bridge, and the material comprises a double-block ballastless track bed plate, a supporting layer, a tunnel and a bridge;
The double-block ballastless track space coupling model comprises a first space coupling model and a second space coupling model,
The first space coupling model is obtained by carrying out static damage analysis on a component model of the double-block ballastless track to determine passenger-cargo collineation load parameters; the second space coupling model is obtained by carrying out dynamic damage analysis on the component model of the double-block ballastless track and establishing a whole bus and truck model;
The component model is a model which is established based on the main body structure and the material form and relates to steel rails, sleeper, connecting parts, track beds and turnouts.
2. The method for analyzing the damage of the passenger-cargo collinear double-block ballastless track according to claim 1, wherein the damage analysis comprises tension damage analysis, compression damage analysis, total stiffness damage analysis and plastic strain analysis.
3. The method for analyzing the damage of the passenger-cargo collinear double-block ballastless track according to claim 1, wherein the parameters substituted into the space coupling model of the double-block ballastless track further comprise density, elastic modulus and poisson ratio.
4. A system for analyzing the injury of a passenger-cargo collinear double-block ballastless track is characterized by comprising
The plastic damage parameter determining module is used for determining the main body structure and materials of the passenger-cargo collinear rail, obtaining a plastic damage constitutive relation according to the specification and the experiment, and calculating to obtain plastic damage parameters;
The modeling module is used for establishing a double-block ballastless track space coupling model, and substituting the plastic damage parameters into the double-block ballastless track space coupling model to obtain a passenger-cargo collineation double-block ballastless track space coupling model;
the damage analysis module is used for carrying out damage analysis and calculation by using the obtained passenger-cargo collinear double-block ballastless track space coupling model;
The plastic damage parameter determining module is further used for establishing a test block simulation model to verify the plastic damage parameters,
Substituting the plastic damage parameters into the space coupling model of the double-block ballastless track to obtain the space coupling model of the passenger-cargo collineation double-block ballastless track if the plastic damage parameters are correct; if the plastic damage parameters are wrong, the parameters are redetermined for verification;
wherein the geometric dimension of the test block simulation model is consistent with the specification related to the strength test;
The double-block ballastless track space coupling model comprises a first space coupling model and a second space coupling model,
The first space coupling model is obtained by carrying out static damage analysis on a component model of the double-block ballastless track to determine passenger-cargo collineation load parameters; the second space coupling model is obtained by carrying out dynamic damage analysis on the component model of the double-block ballastless track and establishing a whole bus and truck model;
The component model is a model which is established based on the main body structure and the material form and relates to steel rails, sleeper, connecting parts, ballast beds and turnouts;
The plastic damage parameters comprise corresponding data columns of tensile stress-inelastic strain, compressive stress-inelastic strain, tensile damage factor-inelastic strain and compressive damage factor-inelastic strain;
the main structure comprises two types of double-block ballastless tracks in a tunnel and double-block ballastless tracks on a bridge, and the material comprises a double-block ballastless track bed board, a supporting layer, a tunnel and a bridge.
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| CN103678823A (en) * | 2013-12-25 | 2014-03-26 | 西南交通大学 | Plate-type ballastless track structure evaluation method based on CA mortar damage |
| JP2016004543A (en) * | 2014-06-19 | 2016-01-12 | マツダ株式会社 | Finite element analysis device, method and program |
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| CN103678823A (en) * | 2013-12-25 | 2014-03-26 | 西南交通大学 | Plate-type ballastless track structure evaluation method based on CA mortar damage |
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