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Bridge damage online monitoring method based on daily temperature effect

A temperature effect and temperature response technology, applied in the field of bridge condition monitoring, can solve problems such as inability to be sensitive to damage in time, limited range of action, undetectable, etc., to overcome limited range of action, facilitate data collection and processing, and improve accuracy Effect

Active Publication Date: 2018-08-24
SHANXI HEXINJIYE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method is simple, it also has some defects. On the one hand, strain sensors are sensitive to structural damage, but their range of action is limited, and a dense array of strain sensors is required to effectively monitor damage (or use long-gauge strain sensors); on the other hand, On the one hand, although the conventional deflection sensor can make up for the defect of the limited range of the strain sensor, it responds slowly, cannot be sensitive to damage in time, and even cannot detect small damage.

Method used

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  • Bridge damage online monitoring method based on daily temperature effect
  • Bridge damage online monitoring method based on daily temperature effect
  • Bridge damage online monitoring method based on daily temperature effect

Examples

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Effect test

Embodiment 1

[0050] In the embodiment of the present invention: an online monitoring method for bridge damage based on the daily temperature effect, comprising the following steps:

[0051] Step 1: Establish a bridge online monitoring system to collect real-time strain data on the bridge beam surface; the bridge real-time monitoring system is mainly composed of three parts: sensor system, data transmission system, and data processing system. Among them, each box girder is installed Several strain sensors, the sensor data are collected by the data transmission system, packaged and sent to the data processing system to form a database;

[0052] Step 2: Extract the daily temperature response data from the strain sensor data; the strain sensor data signal includes signals such as load response, daily temperature response, shrinkage and creep, and the noise of the sensor itself; among them, the daily temperature response is the bridge heat caused by sunlight The strain caused by expansion and c...

Embodiment 2

[0069] Based on the description of the first embodiment above, the complete data processing process of the present invention is as follows figure 1 As shown, the following is a detailed introduction to each part of the block diagram:

[0070] Step 1: Install the strain sensor; install 3 strain sensors of the same type at the mid-span, 1 / 4 span, and 3 / 4 span of the same beam (such as figure 2 shown); after the initial value calibration, the signal is connected to the data acquisition module, and the acquisition module wirelessly sends it to the data platform for processing and display; the data sampling rate is fixed at 30 minutes (due to the collection of daily temperature effect data, the sampling rate here The rate can be appropriately relaxed, which can reduce the data storage requirements of the monitoring platform);

[0071] Step 2: Test the data path; display the sensor data by the data platform, and manually judge whether the data acquisition system is working normall...

Embodiment 3

[0091] Based on the description of above-mentioned embodiment one and embodiment two, the Dongchuan River Bridge of Xinbao Expressway is taken as an example to illustrate the damage judgment situation of the present invention; Four spans are installed with 4*3*2*2=48 strain sensors, where the left and right sides of each span are installed in the same position (such as image 3 shown);

[0092] Taking YLL442 and YLL443 among them as examples, the fastening state of the sensor is artificially changed to simulate the change of the stress state. The original monitoring data of the two sensors are as follows: Figure 4 As shown, the daily temperature response signal extracted after preprocessing and wavelet filtering is as follows: Figure 5 Shown; Calculate the phase difference and amplitude difference of these two sensors, the results are as follows Image 6 , Figure 7 Shown; the final integrated damage status index is as follows Figure 8 shown in Figure 8 There is a pla...

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Abstract

The invention discloses a bridge damage online monitoring method based on a daily temperature effect. The method includes the following steps: processing strain measurement data of a bridge online monitoring system to obtain a daily temperature strain response; and calculating phase differences of daily temperature responses among different sensors, and judging damage positions and the damage degree of a bridge according to amplitude changes of the daily temperature responses. According to the invention, day temperature is used as a forced excitation source, that is to say, the bridge floor issubjected to expand with heat and contract with cold under the effect of the daily temperature, and since a daily temperature change period is slow, the sampling frequency of the monitoring system can be greatly reduced and therefore the software and hardware cost of the system is reduced. In addition, and damage is judged through the phase differences of the daily temperature responses, therebyeffectively overcoming the defect that the measuring range of a strain sensor is limited and improving the accuracy of damage judgment. Based on the above two characteristics, the method is close to engineering and is quite suitable for being applied to an online bridge detection system.

Description

technical field [0001] The invention relates to the technical field of bridge state monitoring, in particular to an online bridge damage monitoring method based on daily temperature effects. Background technique [0002] With the development of my country's economy, the investment in infrastructure construction and the scale of development are increasing. Correspondingly, structural safety issues have also become prominent, and the safety of bridge structures has received widespread attention. [0003] Bridge engineering often has the characteristics of large investment, long design cycle, harsh use environment, easy to deteriorate due to the influence of surrounding atmosphere, temperature, humidity and weather, and bears dynamic load for a long time. It is very important to detect and evaluate the safety of bridge structures. necessary. According to the relevant regulations, the responsible party of the bridge structure needs to regularly organize professionals to inspect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M5/00
CPCG01M5/0008
Inventor 任永平田捷
Owner SHANXI HEXINJIYE TECH
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