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Bridge real-time safety state monitoring method utilizing single measuring point response

A safe state, single measuring point technology, applied to measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve the problem of increasing the initial investment and daily operation and maintenance costs of bridge operators, increasing the difficulty of structural monitoring, and redundant monitoring data and other issues, to achieve the effect of reducing the cost of monitoring equipment, reducing the amount of calculation, and fast calculation speed

Active Publication Date: 2020-01-07
JINAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current bridge structure health monitoring system, since the construction of the bridge structure is completed, a large number of sensors have been installed on the bridge structure to monitor various structural characteristics in real time, resulting in an excessively large amount of information stored in the bridge structure monitoring system.
On the one hand, the total amount of sensor equipment installed in the current bridge structure has greatly increased the initial investment and daily operation and maintenance costs of the bridge operator; on the other hand, the redundant monitoring data has increased the difficulty of structural monitoring

Method used

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  • Bridge real-time safety state monitoring method utilizing single measuring point response
  • Bridge real-time safety state monitoring method utilizing single measuring point response
  • Bridge real-time safety state monitoring method utilizing single measuring point response

Examples

Experimental program
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Effect test

Embodiment 1

[0063] like figure 1 as shown, figure 1 It is a flow chart of a bridge real-time safety state monitoring method using acceleration response of a single measuring point disclosed in an embodiment of the present invention. The schematic diagram of the steel bridge model used in this embodiment is as follows figure 2 . The model beam length l is 20m, and the sampling frequency f s It is 200Hz, and the damaged position is at the beam length 0.4l.

[0064] The specific implementation process is as follows:

[0065] S1. Install an acceleration sensor at any position on the bridge. In order to illustrate the effectiveness of the sensor installed in different positions of this method, the acceleration sensor 1 and the acceleration sensor 2 are respectively installed at 6 / 10 and 1 / 10 of the girder bridge, as figure 2 shown.

[0066] S2. Measure the acceleration response x(i) of bridge vibration, i=1, 2,..., N, where N is the measured response length. In this embodiment, the t...

Embodiment 2

[0103] In order to illustrate the practicability and effectiveness of the present invention, in the real-time safety monitoring of an actual long-span suspension bridge, an accident was successfully monitored by using the technology of the present invention. The accident happened when the bottom of the steel box girder of the main span of the bridge was slightly scratched by a mast of a sand ship. The time of occurrence was 8 o'clock in the morning. The vibration of the bridge had abnormal behavior, and the measured response did not have any abnormality. However, the technology of the present invention was used to successfully monitor to this accident. In this embodiment, the object is a suspension bridge across the Pearl River, such as Figure 10 shown. Sampling frequency f s 200Hz. The specific implementation process is as follows:

[0104] S1. Install an acceleration sensor at any position on the bridge. In order to illustrate the effectiveness of sensors installed in ...

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Abstract

The invention discloses a bridge real-time safety state monitoring method utilizing a single measuring point response. The method comprises the following steps of S1, arranging an acceleration sensoron a bridge; S2, measuring an acceleration response of bridge vibration; S3, defining a moving time window, intercepting a measured signal, and reconstructing the signal in the window into an embeddedstate space matrix Xi by using a time delay method; S4, performing principal component analysis on the state space matrix Xi; S5, defining bridge safety evaluation indexes R1(i); S6, obtaining a timesequence of the R1(i) in the window by moving the time window; and S7, judging whether the safety state of a bridge structure is changed or not according to whether a curve of the R1(i) curve is suddenly changed or not. According to the method, whether the damage degree of the bridge structure is changed or not can be effectively reflected in real time only by utilizing the response measured by the single acceleration sensor, without comparison based on a finite element model with the accurate structure.

Description

technical field [0001] The invention relates to the technical field of structural safety monitoring, in particular to a method for monitoring the real-time safety state of a bridge using a single measuring point response. Background technique [0002] At present, bridge structural health monitoring is facing the problems of too many measuring points and huge monitoring data. In the current bridge structure health monitoring system, since the construction of the bridge structure is completed, a large number of sensors have been installed on the bridge structure to monitor various structural characteristics in real time, resulting in an excessively large amount of information stored in the bridge structure monitoring system. On the one hand, the total amount of sensor equipment installed in the current bridge structure has greatly increased the initial investment and daily operation and maintenance costs of the bridge operator; on the other hand, the redundant monitoring data ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 聂振华沈兆丰谢永康邓杰龙刘思雨赵晨马宏伟
Owner JINAN UNIVERSITY
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