A Bridge State Detection and Evaluation Method Based on Distributed Optical Fiber Monitoring and Full-length Strain Distribution of the Main Girder
A distributed optical fiber and strain distribution technology, which is applied in the direction of measuring devices, elastic testing, and optical devices, etc., can solve problems such as the inability to obtain strain distribution patterns, potential safety hazards in structural inspection and evaluation, and fewer main girder strain measurement points.
Active Publication Date: 2021-01-05
HARBIN INST OF TECH +1
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[0003] In order to solve the problem that in the existing large-scale bridge structure state detection and safety assessment, there are too few main girder strain measurement points, and the strain distribution mode cannot be obtained, resulting in potential safety hazards in structural detection and evaluation, the present invention proposes a monitoring method based on distributed optical fiber Bridge condition detection and evaluation method based on the strain distribution of the main girder and the whole length of the bridge
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Embodiment 1
[0089] combine figure 1 , figure 2 , image 3 with Figure 4 To illustrate this embodiment, figure 1 It is a schematic diagram of the layout position of the distributed optical fiber on the main girder of a suspension bridge and the vehicle load test condition, as shown in figure 1 As shown, the method of the present invention is used to detect the structural safety of a large suspension bridge. First, two distributed sensing optical cables are laid on the inner floor of the steel box girder, one is distributed strain sensing optical cable (DFOS1) and the other is distributed temperature sensing optical cable (DFOS2). Two distributed sensing optical cables are located in the central area of the symmetry axis of the steel box girder section, passed through the gap between the bottom plate stiffener and the diaphragm, and laid along the bridge direction, covering the entire length of the main girder. Taking the vehicle load (Case1) at the mid-span position of the left si...
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The invention relates to a bridge state detection and evaluation method based on distributed optical fiber monitoring and main girder full-length strain distribution, and belongs to the technical field of structural health monitoring. The method includes arranging the distributed sensing optical fiber on the main girder of the bridge along the direction of the bridge, the distributed sensing optical fiber covers the entire length of the main girder, carrying out a vehicle load test on the bridge, and using a long-distance high-spatial-resolution distributed optical fiber demodulator Measure the strain distribution of the entire length of the main girder; by comparing the measured strain value and the design allowable strain value at each position within the entire length of the main girder, detect the abnormal position of the structural strain covering the entire length of the bridge; by comparing the match between the measured strain distribution pattern and the design strain distribution pattern of the bridge To detect the abnormality of the strain distribution pattern of the bridge structural system; to evaluate the safety of the bridge state by combining the strain response value and the distribution pattern. The method proposed by the invention solves the problem of potential safety hazards in bridge detection and evaluation and effectively improves the bridge safety detection level.
Description
technical field [0001] The invention relates to a bridge state detection and evaluation method based on distributed optical fiber monitoring and full-length strain distribution of main girders, and belongs to the technical field of structural health monitoring. Background technique [0002] Bridge status inspection is an important measure to ensure the safe service of bridges. In order to keep abreast of the health status of bridge structures and ensure that they can continue to serve safely, large bridges will regularly conduct bridge status inspections. Through the bridge status inspection, the early damage of the bridge structure can be detected early, and the maintenance and reinforcement can be carried out in time to avoid major safety hazards. The condition detection of large bridges usually adopts the vehicle load test method, in which the strain variation of the main girder is one of the important detection items. By applying specific vehicle loads on the bridge dec...
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IPC IPC(8): G01M5/00G01B11/16G06F30/13G06F30/23
CPCG01M5/0008G01M5/0033G01B11/16G06F30/13G06F30/23
Inventor 李惠徐金龙董永康张照辉张东昱
Owner HARBIN INST OF TECH