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Measuring method of steel bar tension in concrete bridge based on inverse magnetostriction

A technology of inverse magnetostriction and measurement methods, applied in the direction of force/torque/power measuring instruments, measuring devices, instruments, etc., can solve problems such as the influence of magnetic permeability and the influence of material magnetization, and achieve high reliability, easy implementation, good sensitivity

Active Publication Date: 2016-01-13
CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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Problems solved by technology

Moreover, the hysteresis phenomenon of the magnetic material that makes up the steel bar will affect the magnetic permeability during the process of being magnetized by the external magnetic field, and the steel bar material will also affect the magnetization of the material when it is subjected to an external force

Method used

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  • Measuring method of steel bar tension in concrete bridge based on inverse magnetostriction
  • Measuring method of steel bar tension in concrete bridge based on inverse magnetostriction
  • Measuring method of steel bar tension in concrete bridge based on inverse magnetostriction

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specific Embodiment

[0146] For the above two methods of solving tension, by setting some parameters, the actual experiment is carried out according to the two situations of slow change and AC change, and some experimental parameters are set as shown in the following table:

[0147]

[0148] 1) First, the experiment is carried out according to the calculation formula of slowly changing tension. At this time, the excitation magnetic field takes three values, which are 500A / m, 300A / m, and 100A / m. The experimental results are as follows image 3 As shown, the picture is the result picture of loading pressure from 0 to 50MPa. A simple analysis shows that the induced integral voltage changes linearly with the applied external force, and the output induced integral voltage is slightly different with different excitation magnetic fields. In the case of loading pressure from 0 to 50MPa, the excitation magnetic field has little effect, that is to say, under the three operating points of the excitation m...

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Abstract

The invention discloses a concrete bridge steel bar tension measuring method based on converse magnetostriction. The method includes the following steps: (1) an induction coil and an excitation coil are respectively arranged on a detected bridge steel bar from the inside to the outside, and the induction coil and the excitation coil are coaxially wound and separated in an insulating mode; (2) excitation voltage parameters are preset, excitation voltage is applied to the excitation coil according to the preset excitation voltage parameters, and parameters of induction voltage generated on the induction coil due to the excitation voltage are detected; (3) tension of the steel rib is divided into a slow change and an alternating change according to any group of the parameters measured in the step (2), and the tension of the steel rib can be calculated in different steps. The method has the advantages of being easy to achieve, good in sensitivity and high in reliability.

Description

technical field [0001] The invention relates to a technique for statically and dynamically measuring the tension of bridge reinforcement, in particular to a method for measuring the tension of reinforcement based on the inverse magnetostrictive effect. Background technique [0002] Rebar tension measurement based on inverse magnetostriction is a method to realize tension measurement by using the intrinsic relationship between the magnetic properties of the rebar itself and the tension it receives. It has fast dynamic response, long service life, low price and strong overload protection ability. And other outstanding advantages, has become one of the main research hotspots of tension measurement at home and abroad. [0003] In foreign research, most of the tension is converted by measuring the curve of the average magnetic permeability of the material with the loading external force. Because the accurate measurement and dynamic measurement of the magnetic permeability are to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L5/00
Inventor 唐光武姜建山
Owner CHINA MERCHANTS CHONGQING COMM RES & DESIGN INST
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