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Steel deck pavement interlayer shear test simulation method based on discrete element

A technology of shear test and simulation method, which is applied in the field of steel bridge deck pavement engineering, and can solve the problems of not considering the interface between layers, stress concentration in the failure path, and adverse effects on the shear resistance performance of layers

Active Publication Date: 2018-12-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Whether it is numerical simulation or experimental research, when analyzing the interlayer shear performance of steel deck pavement composite structures, the influence of the interlayer interface mesostructure is not considered, such as air bubbles, pavement, etc. Factors such as unevenness and initial cracks at the interface between the layer and the steel plate, and these factors will affect the failure path and generate stress concentration, which will adversely affect the shear resistance between layers

Method used

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  • Steel deck pavement interlayer shear test simulation method based on discrete element
  • Steel deck pavement interlayer shear test simulation method based on discrete element
  • Steel deck pavement interlayer shear test simulation method based on discrete element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A method for simulating shear tests between layers of steel bridge deck pavement based on discrete elements comprises the following steps:

[0042] Step 1: Use the "wall" command in the PFC3D software to generate a given asphalt pavement area, and put coarse aggregate particles 1 in the asphalt pavement area according to the coarse aggregate particle 1 model construction method;

[0043] Step 2: In the area of ​​the asphalt pavement layer in a rectangular arrangement, several coarse aggregate particles are regularly generated to fill the entire area, and the FISH programming is used to determine whether the particle unit belongs to the coarse aggregate particle 1, and if so, identify it as Coarse aggregate particle 1, otherwise it is identified as asphalt mortar particle 2, and according to the construction method of the void model, the asphalt mortar particle 2 is deleted to form the void unit of the asphalt pavement layer, thereby generating the asphalt pavement model,...

Embodiment 2

[0049] Taking the interlayer shear of the steel bridge deck pavement of asphalt mixture AC-10 as an example, the implementation steps of the present invention are described in detail in conjunction with the accompanying drawings. The gradation of asphalt mixture AC-10 is shown in Table 1.

[0050] Table 1 Grading table of asphalt mixture AC-10

[0051] Mesh size / mm

13.2

9.5

4.75

2.36

1.16

0.6

0.3

0.15

0.075

Passing rate / %

100

92

71

39

22.5

17

12.5

8.5

6

[0052] The specific modeling process of steel bridge deck pavement composite specimen is as follows:

[0053] 1) Determination of the space area

[0054] According to the actual size of the indoor test model, the size of the asphalt pavement area is 95mm×95mm×60mm, the size of the steel plate area is 95mm×95mm×10mm, and the two areas are closely connected, such as figure 1 shown.

[0055] 2) Generation of asphalt mixture coarse aggregate particles,...

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Abstract

The invention provides a steel deck pavement interlayer shear test simulation method based on a discrete element and belongs to the technical field of steel deck pavement. The steel deck pavement interlayer shear test simulation method based on the discrete element comprises the specific steps of generating a three-dimensional discrete element composite test piece whose dimension and gradation areboth as same as the dimension and the gradation of an indoor test piece in a PFC3D software by referring to a steel deck pavement indoor test composite test piece; giving corresponding contact typesto the interiors of course aggregate particles, the interiors of asphalt mortar particles, the interiors of steel plate particles, parts between the course aggregate particles and the asphalt mortar particles, parts between the course aggregate particles and the steel plate particles and parts between the asphalt mortar particles and the steel plate particles in the steel deck pavement composite test piece; introducing two concepts of interlayer roughness and interlayer air bubbles; through FISH programming, establishing a steel deck pavement composite test piece model which considers different interlayer contact states; and through the shearing of a wall body to the steel deck pavement composite test piece model, analyzing influences of the different interlayer contact states on a steel deck pavement interlayer shear failure mechanism. The steel deck pavement interlayer shear test simulation method based on the discrete element, provided by the invention, has the advantages of being accurate and effective.

Description

technical field [0001] The invention relates to the field of steel bridge deck pavement engineering, in particular to a discrete element-based simulation method for interlayer shear tests of steel bridge deck pavement. Background technique [0002] In the composite structure of the steel bridge deck pavement system, the asphalt concrete pavement layer and the steel bridge deck are closely connected through the bonding layer, and bear and deform together. Under the action of vehicle load and environmental conditions, when the shear strength between the pavement layer and the steel bridge deck cannot meet the force requirements, interlayer shear failure will occur, resulting in interlayer cracks, which seriously affect the traffic, so It is particularly important to study the interlayer shear characteristics of steel bridge deck pavement. [0003] Find the existing results and literature, when using the finite element numerical simulation method to analyze the shear performan...

Claims

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Application Information

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IPC IPC(8): G01N3/24G06F17/50
CPCG01N3/24G01N2203/0003G01N2203/0025G01N2203/0062G01N2203/0075G06F30/13G06F30/20
Inventor 刘云徐恭圣
Owner HOHAI UNIV
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