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Beam bridge displacement dynamic measurement system and measurement method based on strain gauges

A dynamic measurement and strain gauge technology, applied in measurement devices, instruments, etc., can solve problems such as no effective method

Inactive Publication Date: 2010-10-20
JILIN UNIV
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  • Description
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Problems solved by technology

The dynamic strain of the bridge can be easily measured, but there is currently no effective method to obtain the dynamic displacement of the bridge using the data measured by the strain gauge

Method used

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  • Beam bridge displacement dynamic measurement system and measurement method based on strain gauges
  • Beam bridge displacement dynamic measurement system and measurement method based on strain gauges
  • Beam bridge displacement dynamic measurement system and measurement method based on strain gauges

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Embodiment Construction

[0065] In the dynamic monitoring of bridge displacement, it can be seen from the theory that for any span in the bridge, the number of basis functions k=4 and the number of measuring points n=5 can make the displacement measurement error within 1%. Meet the requirements of engineering precision. The origin of the coordinates is selected as the left support, and the span of the bridge is l, then l 1 = 0, l 2 = l, construct the calculation model of the deflection line:

[0066] y(x)=x(x-l)(X 1 +X 2 ·x+x 3 x 2 +X 4 x 3 )

[0067] Referring to the accompanying drawings, the strain gauge 1 in the measurement system is arranged on the bridge to be measured. Five sets of strain gauges are arranged at each span of the bridge along the longitudinal span of the beam, and each set of strain gauges includes two strain gauges 2 arranged along the beam height. For bridges under construction, embedded strain gauges can be used to embed the strain gauges in the concrete; for bridges...

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Abstract

The invention relates to a beam bridge displacement dynamic measurement system based on strain gauges, the system comprises the strain gauges that are used for measuring strain in real time and an acquisition device that is used for acquiring strain data in real time; the system is characterized in that the strain gauges are arranged on a bridge to be measured along the beam longitudinal direction at an equal interval, the strain gauges of each span have at least 5 groups, each group has two strain gauges, and the strain gauges are arranged along the beam height; and the system also comprises a strain data processing device which is used for processing the acquired strain data, thus obtaining the curvature of a bridge deflection line, and then a deflection function is fitted by using curvature data, thus finally obtaining a bridge deflection function and the dynamic displacement at any point of the bridge. Starting from the basic definitions of displacement and strain, a beam bridge displacement dynamic measurement method based on the strain gauges is formed by establishing the inner relationship between the displacement and the strain. The method does not need any displacement measuring apparatus and only utilizes the existing strain data to analyze the bridge displacement in real time and to form dynamic response of the displacement.

Description

technical field [0001] The invention belongs to the technical field of physical processing, in particular to a beam bridge displacement dynamic measurement system and measurement method that utilizes existing strain data to analyze bridge displacement in real time and can form a dynamic response to displacement. Background technique [0002] Bridge stiffness is one of the main factors that determine whether the bridge can operate safely. The stiffness information of the bridge can be obtained by measuring the displacement of the key parts of the bridge. Therefore, it is very necessary to perform real-time dynamic measurement of the bridge displacement. [0003] When the bridge crosses obstacles such as rivers, rivers, and mountain streams, or crosses urban roads, it is difficult to install contact displacement measuring instruments (such as displacement meters, etc.) because fixed brackets cannot be arranged. Due to the hysteresis of displacement response, the non-contact di...

Claims

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Application Information

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IPC IPC(8): G01B21/02
Inventor 刘寒冰王龙林谭国金程永春魏海滨宫亚峰毕海鹏
Owner JILIN UNIV
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