Bridge vertical displacement real-time monitoring device and method based on fiber grating displacement meter

Abstract

The invention discloses a bridge vertical displacement real-time monitoring device based on a fiber grating displacement meter. The device comprises a stay wire and a fiber grating displacement meter, wherein one end of the stay wire is fixed on a measuring point at the bottom of a bridge, the other end of the stay wire is fixed with the detection end of the fiber grating displacement meter, the fiber grating displacement meter is installed on an angle cushion block, the angle cushion block is fixed on the vertical supporting part of the bridge, the fiber grating displacement meter is connected with a fiber grating demodulator through a jumper wire, and the fiber grating demodulator collects data and enables the data to be collected by a computer. The invention also discloses a detection method, which comprises the following steps: carrying out calibration and temperature compensation on a fiber grating displacement meter, fitting the mounting angle and vertical displacement data measured by the fiber grating displacement meter under a simulation condition, obtaining a ratio of vertical displacement to oblique displacement according to a fitting result, and calculating vertical displacement data according to the ratio. According to the invention, the device is convenient and fast to install, controllable in cost and high in safety coefficient, and meets the detection requirements.

Description

technical field [0001] The invention relates to the field of health monitoring of small and medium bridges, in particular to a real-time monitoring device and method for bridge vertical displacement based on an optical fiber grating displacement meter. Background technique [0002] The vertical displacement of the bridge is the most useful, the most intuitive, and the most convenient to observe the main monitoring index, which is closely related to the actual state of the bridge. One of the most important indicators, it not only reflects the overall stiffness of the bridge in the vertical direction, but also reflects the bearing capacity of the bridge. Many applications. [0003] Since the bridge spans water bodies or roads, the vertical displacement detection of the bridge cannot be directly measured by erecting a laser displacement meter directly under the monitoring point. It is necessary to build a platform or install a transverse beam to fix the laser displacement mete...

AI Technical Summary

Problems solved by technology

[0003] Since the bridge spans water bodies or roads, the vertical displacement detection of the bridge cannot be directly measured by erecting a laser displacement meter directly under the monitoring point. It is necessary to build a platform or install a transverse beam to fix the laser displacement meter. This method greatly increases the cost, and When the bridge is under the road, there is also the risk of falling and collision due to the height limit, and the safety factor is extremely low, so it is usually difficult to establish a fixed reference point. Vertical displacement is still the most difficult to measure in long-term real-time monitoring one of the parameters

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