Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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

A seamless line, ballastless track technology, applied in the direction of calculation, special data processing applications, instruments, etc., can solve the problems of difficult beam-rail interaction reaction, many model structural elements, unfavorable rapid check calculation, etc. Theoretical value and commercial promotion prospects, the effect of wide application and convenient modeling

Inactive Publication Date: 2015-10-21
BEIJING JIAOTONG UNIV +1
View PDF2 Cites 17 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Simplified design method for continuously-welded rail of ballastless track of ultra-large bridge of railway
  • Simplified design method for continuously-welded rail of ballastless track of ultra-large bridge of railway
  • Simplified design method for continuously-welded rail of ballastless track of ultra-large bridge of railway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] In this example, in order to verify the correctness of the simplified model, a 62.5m single-span solid simply supported beam and a simplified simply supported beam were respectively established for comparative analysis. The calculation conditions are as follows: the temperature of the rail is raised by 40°C, and the temperature of the track slab is raised by 20°C , the temperature of the bridge rises by 25°C. Figure 8 is the rail longitudinal displacement diagram of the two calculation models under the action of temperature load, Figure 9 The rail longitudinal force diagrams of the two calculation models under the action of temperature load. Table 1 shows the size and calculation time of the two calculation models, and Table 2 lists the calculation results of the two calculation models under the same temperature load:

[0057] Table 1: Model size and computation time for two computational models

[0058] solid model simplified model model size ...

Embodiment 2

[0063] In this example, in order to verify the correctness of the simplified model, a 62.5m single-span solid simply supported beam and a simplified simply supported beam were respectively established for comparative analysis. The calculation conditions are as follows: the vehicle load is calculated according to the ZK load, Apply a deflection force, the magnitude of the deflection force is 64kN / m / line, the loading diagram is as follows Figure 8 shown. Figure 10 are the rail longitudinal displacement diagrams of the two calculation models under the flexural load, Figure 11 The rail longitudinal force diagrams of two calculation models under the action of flexural load. Table 3 shows the size and calculation time of the two calculation models, and Table 4 lists the calculation results of the two calculation models under the same flexural load:

[0064] Table 3: Model size and computation time for two computational models

[0065] solid model simplified mode...

Embodiment 3

[0070] In this embodiment, a 62.5m single-span solid simply supported beam and a simplified simply supported beam are respectively established for comparative analysis, and the calculation conditions are as follows: the load is taken as ZK live load, and the braking rate is 0.164. Figure 13 The rail longitudinal displacement diagrams of the two calculation models under the braking load, Figure 14 The rail longitudinal force diagrams of the two calculation models under the braking load. Table 5 shows the size and calculation time of the two calculation models, and Table 6 lists the calculation results of the two calculation models under the same braking load:

[0071] Table 5: Model size and computation time for two computational models

[0072] solid model simplified model model size 163MB 29.2MB calculating time 149s 32s

[0073] Table 6: Calculation results of two calculation models under the same braking load

[0074]

[0075] From...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 辛涛高亮林超肖宏蔡小培刘亚男钟阳龙张琦刘超孙国力
Owner BEIJING JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products