A multi-scale design method for steel deck pavement of road-rail dual-purpose bridge

It is a technology with dual-use design method for highway and railway, which is applied in the field of bridge structure engineering, and can solve problems such as lack of consideration of the influence of railway bridges, damaged shear studs, and service life of steel mesh detail components.

Active Publication Date: 2020-03-10
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The design parameters of the shear studs, steel mesh and other detailed components of the highway bridge deck pavement of highway and railway bridges are often derived from the application of general highway bridges, without considering the impact on railway bridges. The indirect effect of load on the road bridge deck pavement such as impact and vibration will also greatly damage the service life of shear studs, steel mesh and other detailed components

Method used

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  • A multi-scale design method for steel deck pavement of road-rail dual-purpose bridge
  • A multi-scale design method for steel deck pavement of road-rail dual-purpose bridge
  • A multi-scale design method for steel deck pavement of road-rail dual-purpose bridge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] This part compares the strain of the steel deck pavement under the coupling effect of the highway load and the railway load on the whole bridge model of the highway-railway bridge. For the value of road load, refer to "JTG D60-2015 General Code for Design of Highway Bridges and Culverts", and for the value of railway load, refer to "Basic Code for Design of Railway Bridges and Culverts TB10002.1 2005".

[0071] Table (1): Strain values ​​of steel bridge deck pavement under coupled loads of road and railway (με)

[0072] project train load car load combined load Maximum longitudinal tensile strain 92.4 68.4 152 Maximum transverse tensile strain 33.9 47.8 81.7

[0073] From table (1) and Figure 8 It can be seen that the contribution rates of highway load and railway load to the maximum longitudinal tensile strain are 40% and 60%, respectively, and the contribution rates to the maximum transverse tensile strain are 58.5% and 41.5%, res...

Embodiment 2

[0075] As a shear member, shear studs are widely used in steel-concrete composite structures. Their important role is to bear the shear action between concrete and steel plates, and at the same time strengthen the integrity of steel bridge deck and pavement. This part compares and analyzes the influence of different shear stud diameters, spacing and heights on the stress of steel bridge deck pavement.

[0076] Table (2) Bearing state of steel bridge deck pavement with different shear stud spacing (MPa)

[0077] Shear stud spacing transverse tensile stress Longitudinal tensile stress transverse shear stress Longitudinal shear stress 300mm×300mm 0.58 0.542 0.356 0.902 400mm×400mm 0.6 0.563 0.387 0.987 500mm×500mm 0.679 0.684 0.499 1.176

[0078] Table (3) Bearing status of concrete pavement lower layer with different shear nail diameters (MPa)

[0079] Shear stud diameter transverse tensile stress Longitudinal tensi...

Embodiment 3

[0086] This part compares the influence of elastic modulus of different pavement materials on the stiffness of asphalt pavement.

[0087] Table (6) Influence of asphalt pavement stiffness (MPa)

[0088] Elastic modulus / MPa transverse tensile stress Longitudinal tensile stress transverse shear stress Longitudinal shear stress 400 0.03 0.032 0.131 0.128 800 0.028 0.031 0.129 0.125 1000 0.026 0.03 0.128 0.125 1200 0.025 0.029 0.127 0.124 1400 0.025 0.029 0.127 0.124

[0089] It can be seen from Table (6) that as the elastic modulus of the asphalt pavement increases, the stress indexes of the asphalt pavement decrease slightly, and after reaching 1200 MPa, the stress indexes of the asphalt pavement do not change. Considering the strength, durability and economy of asphalt pavement concrete comprehensively, choosing 1200MPa for concrete elastic modulus is a reasonable choice. When designing the steel deck pavement struc...

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Abstract

The invention provides a multi-scale design method for highway-railway dual-purpose bridge steel bridge deck pavement. The method comprises the steps that a highway-railway dual-purpose bridge whole-bridge model, a highway bridge local model and a pavement layer detail model are established through simulation software, static simulation calculation is conducted, analog simulation is conducted on all design parameters of pavement material basic mechanical parameters, reinforcing meshes and shear nails for bridge deck pavement, and then the influence situation on the steel bridge pavement layer is obtained. Accordingly, the method fills in blanks in existing design and construction methods, for the special bridge type of the highway-railway dual-purpose bridge, influence of the highway load and railway load on the highway bridge deck pavement layer is calculated out through simulation, values of all parameters of the models can be determined according to actual design parameters and field measurement data, effective design reference values can be obtained through the detail model for detail structures such as the reinforcing meshes and the shear nails, and partial technical problems faced in design and maintenance and reinforcement are solved.

Description

technical field [0001] The invention belongs to the field of bridge structure engineering, and in particular relates to a multi-scale design method for steel deck pavement of a road-rail dual-purpose bridge. Background technique [0002] Due to its unique structural features, road-rail bridges allow roads and railways to run together, which not only saves resources, but also obtains great economic benefits. It is very common in bridge construction. However, in the current bridge construction code, there is no specific code for the special bridge type of road-rail bridge. In the design, maintenance and reinforcement of road-rail dual-purpose bridges, the road bridge and railway bridge of the road-rail dual-purpose bridge are often designed separately, lacking holistic consideration. As one of the most vulnerable parts to be damaged, the road bridge deck pavement is directly affected by the road load. Due to the connection between the road bridge and the railway bridge, the i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/13G06F30/20G06F111/06
CPCG06F30/13G06F30/20G06F2111/06
Inventor 付军李炙彬刘洁
Owner WUHAN UNIV OF TECH
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