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High-speed railway 32-meter standard beam dynamic deflection monitoring method based on strain mode

A strain mode, high-speed railway technology, applied in the direction of elasticity testing, machine/structural component testing, measuring devices, etc., can solve the problem of box girder section not conforming to the assumption of flat section, and achieve the effect of improving automation

Active Publication Date: 2021-08-20
CHINA RAILWAY DESIGN GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Based on the above deficiencies, the present invention provides a strain mode-based monitoring method for the dynamic deflection of a 32-meter standard beam of a high-speed railway, which can be adapted to solve the problem that the box girder section does not conform to the assumption of a plane section under the action of the train's eccentric load

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  • High-speed railway 32-meter standard beam dynamic deflection monitoring method based on strain mode
  • High-speed railway 32-meter standard beam dynamic deflection monitoring method based on strain mode
  • High-speed railway 32-meter standard beam dynamic deflection monitoring method based on strain mode

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Embodiment 1

[0082] A method for monitoring the dynamic deflection of a 32-meter standard beam of a high-speed railway based on a strain mode, the steps are as follows:

[0083] Step 1, establish the "strain-dynamic deflection" structural dynamics equation of the bridge key section displacement by establishing the strain of the bridge floor measuring point where the strain sensor is located, and the described structural dynamics equation establishment steps are as follows:

[0084] Step 11. In material mechanics, for a slender beam with a span-to-height ratio greater than 5, the influence of shear force on deformation is very small. At this time, the influence of shear deformation can be ignored, and formula (1) is used as the bending deformation deflection of the beam body. The curvature equation of the curve:

[0085]

[0086]Among them, ρ is the radius of curvature of the beam section, M is the bending moment, E is the elastic model of the beam body, I is the moment of inertia of the...

Embodiment 2

[0141] For a 32-meter standard beam, the joint commissioning and joint test dynamic load test before opening to traffic was carried out, and the ANSYS finite element solid unit model was established according to its design drawings. Considering the modeling of prestress and second-stage transverse load, the design elasticity of the beam body The modulus, bulk density and the size of the second-stage dead load of the bridge deck are used as correction parameters to correct the finite element model, and the first-order natural vibration is obtained by power spectrum analysis based on the acceleration data measured by the joint commissioning joint test dynamic load test of a 32-meter standard beam The frequency is 5.86Hz, the first-order frequency is 5.81Hz after the ANSYS model is corrected, and the relative error is 0.85%. It can be considered that the static and dynamic performance of the ANSYS finite element model can well represent the actual bridge. In the ANSYS model analys...

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Abstract

The invention discloses a high-speed railway 32-meter standard beam dynamic deflection monitoring method based on a strain mode, and the method comprises the steps of building a strain-dynamic deflection model considering the correction of the distance from a measuring point to an equivalent neutral layer through employing a mode strain theory based on a vibration mode superposition method based on the characteristics of unbalance load distribution of a train load, the distance between the strain measuring point and the equivalent neutral layer of the cross section of the box girder and the selection of the vibration mode order of the modal matrix having obvious influence on the reconstruction precision of the established strain-dynamic deflection transformation model; correcting the distance between the strain measuring point and the equivalent neutral layer of the cross section of the box girder under the action of unbalance loading of a train by utilizing Ansys numerical simulation, and using the particle swarm optimization to optimize the selection of the modal matrix vibration mode order, so that the effectiveness and accuracy of the method are shown through a UM multi-body dynamics simulation data set and an actual dynamic load test result. According to the invention, automation, intelligence, accuracy and robustness of intelligent identification of the bridge health monitoring real-time early warning subsystem are improved.

Description

technical field [0001] The invention relates to the field of dynamic deflection health monitoring of high-speed railway bridges, in particular to a method for monitoring the dynamic deflection of a 32-meter standard beam of a high-speed railway based on a strain mode. Background technique [0002] So far, the total mileage of high-speed railways in my country has exceeded 35,000 kilometers, and the total mileage of high-speed railway bridges has exceeded 16,000 kilometers. Among the high-speed railway bridges in my country, more than 85% are prestressed concrete simply supported boxes with equal spans. Beam bridges, after nearly ten years of large-scale construction, my country's high-speed railway bridges will fully usher in the maintenance period. The measurement of dynamic deflection of high-speed railway bridges is very important for their operational safety and structural damage assessment. With the advancement of bridge health monitoring technology, people have studied ...

Claims

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Application Information

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IPC IPC(8): G06F30/23G01M5/00
CPCG06F30/23G01M5/0008G01M5/0058G06F2119/14
Inventor 苏伟李顺龙王鑫禚一邸昊魏剑峰
Owner CHINA RAILWAY DESIGN GRP CO LTD