Bridge state detection and evaluation method based on distributed optical fiber monitoring and girder total-length strain distribution
A distributed optical fiber and strain distribution technology, applied in measurement devices, elastic testing, and optical devices, etc., can solve problems such as few main girder strain measurement points, inability to obtain strain distribution patterns, and hidden dangers in structural detection and evaluation.
Active Publication Date: 2019-08-30
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 and 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 sid...
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The invention relates to a bridge state detection and evaluation method based on distributed optical fiber monitoring and girder total-length strain distribution, and belongs to the technical field ofstructure health monitoring. The method comprises the steps that a distributed sensing optical fiber is arranged on a bridge girder along a bridge, the distributed sensing optical fiber covers the total length of the girder, a vehicle load test is performed on the bridge, and strain distribution of the total length of the girder is measured by using a long-distance high-spatial-resolution distributed optical fiber interrogator; by comparing actually measured strain values of all the positions in the total-length range of the girder with a designed allowable strain value, an abnormal positionof a structural strain covering the total length of the bridge is detected; by comparing the degree of matching between an actually measured strain distribution mode of the bridge and a designed strain distribution mode, an abnormal stress distribution mode of a bridge structure system is detected; and safety evaluation is carried out on a bridge state by combining a strain response value and thedistribution mode. According to the method, the problem that potential safety hazards exist in bridge detection and evaluation is solved, and the safety detection level of the bridge is effectively improved.
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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Login to View More IPC IPC(8): G01M5/00G01B11/16G06F17/50
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