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Rapid evaluation method for bridge bearing capacity based on moving vehicle test

A bearing capacity and bridge technology, which is applied in the field of rapid assessment of bridge bearing capacity based on mobile vehicle testing, can solve the problems of high test costs and the inability to give a quantitative evaluation, and achieve the effect of reducing test costs and workload

Active Publication Date: 2021-05-28
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the static load test of the bridge needs to block the traffic, and the test cost is high, which brings a lot of inconvenience to the test
At the same time, for the moving load test, the modal parameters of the bridge are mainly identified at present, and a quantitative evaluation cannot be given for the evaluation of the bearing capacity of the bridge.

Method used

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  • Rapid evaluation method for bridge bearing capacity based on moving vehicle test
  • Rapid evaluation method for bridge bearing capacity based on moving vehicle test
  • Rapid evaluation method for bridge bearing capacity based on moving vehicle test

Examples

Experimental program
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Embodiment 1

[0048] The identification process of the inventive method is as figure 1shown. In this embodiment 1, select the simply supported girder bridge with equal section, the bridge span length is 30m, the elastic modulus of the bridge service state is 27.5Gpa, the elastic modulus of the bridge design state is 25Gpa, the bridge service state and bridge service state other The parameters of the bridge are consistent, and the moment of inertia of the bridge is 0.2m 4 , the mass per linear meter is 2000kg / m, bridge damping is not considered, and the level of unevenness of the bridge deck is "good". Based on the Newmark-β integral, the finite element simulation is carried out, and the dynamic response of the bridge is calculated by using the separation iteration method. The sampling frequency of the displacement sensor is 1000 Hz, and the signal-to-noise ratio is 30 dB. A method for rapid assessment of bridge bearing capacity based on moving vehicle testing includes the following steps:...

Embodiment 2

[0101] The elastic modulus of the bridge service state is 27.5Gpa, the elastic modulus of the bridge design state is 25Gpa, and the other bridge parameters of the bridge service state and the bridge service state are consistent;

[0102] In this embodiment 2, if Figure 9 In the three-span continuous girder bridge with variable cross-section shown, the cross-section of each span is a parabola of degree 1.8, and the length of each span is 10m. Consistent with other bridge parameters in the service state of the bridge, the moment of inertia at the mid-span of the bridge is 0.125m 4 , the moment of inertia at the support is 0.0625m 4 , the mass per linear meter is 2600kg / m, regardless of bridge damping. When the finite element method is used for simulation, the bridge is divided into 300 units equally, and the length of each bridge unit is 0.1m, and 9 measuring points are selected on the bridge. The finite element model of the bridge is as follows: Figure 7 shown. Based on t...

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Abstract

The invention discloses arapid evaluation methodfor the bridge bearing capacity based on moving vehicle test. The method comprises the following steps of: installing a displacement sensor on a bridge, acquiring bridge dynamic response when a vehicle passes through the bridge at a constant speed, performing spectral analysis on the response to determine a cutoff frequency, extracting moving load frequency components by using an analytical mode decomposition method, carrying out polynomial fitting on the moving load frequency components to extract a bridge deflection influence line, then constructing a bridge influence line matrix formula to solve a flexibility matrix of the bridge, establishing a bridge bearing capacity evaluation index based on the flexibility matrix, and evaluating the bridge bearing capacity. According to the invention, the flexibility matrix of the bridge is obtained by arranging a small number of displacement sensors, and the bearing capacity of the bridge is evaluated; therefore, the problems that a large number of measuring points and sensors are needed for obtaining the flexibility matrix of the bridge in the previous test and the traditional static load test is long in test time, large in workload, high in cost, large in risk, and needs to block traffic can be effectively solved.

Description

technical field [0001] The invention relates to the field of bridge safety detection, in particular to a method for quickly evaluating the bearing capacity of a bridge based on a mobile vehicle test, and the evaluation result can be used to determine the safety state of the bridge structure. Background technique [0002] The bridge is an important infrastructure investment project of the country and a key hub in the road network. According to the "Statistical Bulletin on the Development of the Transportation Industry in 2019" issued by the Ministry of Transport, at the end of 2019, there were 878,300 highway bridges and 60,634,600 meters across the country, including 5,716 super-large bridges and 10,332,300 meters, and 108,344 large bridges and 29,237,500 meters. The scale ranks first in the world. From 2000 to 2014, there were 179 bridge collapse accidents caused by non-earthquakes. Frequent bridge collapse accidents have caused huge losses to people's lives and property a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00G01M13/00G06F17/16
CPCG01M5/0008G01M5/005G01M13/00G06F17/16
Inventor 贺文宇黎骏飞李祎琳王佐才任伟新
Owner HEFEI UNIV OF TECH