Method for calculating track mapping deformation after earthquake-induced damage of high-speed railway bridge

Abstract

The invention discloses a method for calculating track mapping deformation after earthquake-induced damage of a high-speed railway bridge. The method comprises the following steps: S1, establishing abasic hypothesis; s2, establishing a mapping relation calculation model between bridge structure deformation and ballastless track structure deformation; s3 model solution. The invention provides a method for calculating a mapping relation between track irregularity on a high-speed railway bridge and earthquake damage deformation of parts below the track, which is suitable for various track structural forms in a high-speed railway. Quantitatively analyzing a mapping relation between accumulated damage of key components of a pier, a support and a track structure and track surface deformation inthe high-speed railway bridge; the method overcomes the defect that nonlinearity of interlayer contact of a track structure is not considered in an existing method for calculating the mapping relation between track irregularity on a high-speed railway bridge and seismic damage deformation of components under the track; the method overcomes the defect that roadbed boundary conditions are not considered in an existing method for calculating the mapping relation between the track irregularity on the high-speed railway bridge and the seismic damage deformation of the under-track part.

Description

technical field [0001] The invention relates to a calculation method for track mapping deformation after earthquake-induced damage of a high-speed railway bridge. Background technique [0002] Under the earthquake, the bridge structure will inevitably produce various damage and deformation modes such as pier inclination, girder body misalignment and rotation angle, and support deformation. Most of these accumulated residual damage deformations will be mapped to the rail surface, causing additional track irregularities. When the train passes by at high speed, the additional irregularity of the track will increase the disturbance of the wheel-rail interface, and then cause the vibration of the train to increase through the dynamic interaction of the wheel and rail, resulting in the deterioration of the safety and comfort indicators of the train, and ultimately affecting the operation of the high-speed train. Safety. [0003] However, there are few studies on the mapping relat...

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Problems solved by technology

[0002] Under the earthquake, the bridge structure will inevitably produce various damage and deformation modes such as pier inclination, girder body misalignment and rotation angle, and support deformation. Most of these accumulated residual damage deformations will be mapped to the rail surface, causing additional track irregularities

When the train passes by at high speed, the additional irregularity of the track will increase the disturbance of the wheel-rail interface, and then cause the vibration of the train to increase through the dynamic interaction of the wheel and rail, resulting in the deterioration of the safety and comfort indicators of the train, and ultimately affecting the operation of the high-speed train. Safety

[0003] However, there is still little research on the mapping relationship between track irregularities on high-speed railway bridges and earthquake damage and deformation of sub-rail components, and it is difficult to determine the safe speed limit for high-speed railway bridges after earthquakes

[0004] The existing calculation methods for the mapping relationship between track irregularities and structural deformation are all based on structural micro-segment equilibrium conditions. Since the track structure is a multi-layer laminated beam structure, the calculation method is cumbersome and complicated.

Moreover, in the calculation method, the influence of contact nonlinearity between layers of the track structure is not considered, and the influence of the boundary conditions of the subgrade is not considered.

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