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Full-bridge response reconstruction method based on finite element and monitoring data fusion

A monitoring data, finite element technology, applied in the field of full bridge response reconstruction, can solve the problem of low response reconstruction accuracy of unmonitored positions

Active Publication Date: 2021-08-20
SICHUAN AGRI UNIV
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Problems solved by technology

[0005] In order to solve the above technical problems, the present invention provides a full bridge response reconstruction method based on the fusion of finite element and detection monitoring data, which avoids the update of the finite element model and solves the problem of low accuracy of unmonitored position response reconstruction

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  • Full-bridge response reconstruction method based on finite element and monitoring data fusion
  • Full-bridge response reconstruction method based on finite element and monitoring data fusion
  • Full-bridge response reconstruction method based on finite element and monitoring data fusion

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Embodiment 1

[0034] The present invention provides a full-bridge response reconstruction method based on fusion of finite element and detection monitoring data, which specifically includes the following steps:

[0035] S1. Use long-gauge fiber grating sensor FBG to monitor and collect data on the whole bridge.

[0036] For the bridge area, there are l units in the longitudinal direction and c units in the transverse direction. It is considered that the ROM of a cell is not only related to the cell ROM in the vertical direction but also to the cell ROM in the horizontal direction. Therefore, the present invention also determines the sensor arrangement rules of each area, such as figure 1 Shown:

[0037] (a) The number of sensors is at least 2c.

[0038] (b) All units on the end section need to be equipped with sensors;

[0039] (c) Select the middle section and the other end section to place the sensor. The sensors on the two parts are arranged symmetrically, and the sum of the number ...

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Abstract

The invention discloses a full-bridge response reconstruction method based on finite element and detection and monitoring data fusion, which comprises the following steps: decomposing bridge detection and monitoring data acquired by distributed long gauge length strain sensors in a time domain by using a POD technology to obtain a reduced-order modal ROM and a time random function TCF; initially estimating the structural response of the prediction unit in combination with the coordinate information of the prediction unit, and decomposing the response and the response of the monitoring unit again to obtain updated ROM and TCF; establishing a finite element model database of damage at different positions of the full bridge; finding out a model matched with the real structure from a model database by utilizing the decomposed ROM; and finally, correcting the updated ROM by using the mapping relation between the monitoring unit and the prediction unit of the matching model, and effectively reconstructing the structural response of the full-bridge unit by using the updated ROM and TCF. According to the method, the limited sensors are used for reconstructing the structural response of the full bridge, and the actual two-dimensional bridge structural performance can be recognized.

Description

technical field [0001] The invention belongs to the field of bridge measurement, in particular to a full bridge response reconstruction method based on fusion of finite element and inspection data. Background technique [0002] In recent decades, structural health monitoring (SHM) has received extensive attention in ensuring structural diagnosis and predicting structural health. As a basic part, bridge measurement plays an important role in the reliability of SHM system. In order to monitor the actual condition of the bridge, the system response of the entire structure needs to be obtained. However, due to the impact of data collection costs or the difficulty of measuring locations, usually only one-dimensional responses can be obtained, and a comprehensive diagnosis and evaluation of structural performance cannot be performed. Therefore, the reconstruction of structural overall response data becomes an important part of the structural health monitoring system. Especially...

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Application Information

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IPC IPC(8): G06F30/13G06F30/17G06F30/23
CPCG06F30/13G06F30/17G06F30/23
Inventor 张青青金志廷朱占元李琦杨畅刘国军魏召兰
Owner SICHUAN AGRI UNIV
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