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Concrete structure combined strain monitoring unit and concrete state evaluation method

A concrete structure and strain monitoring technology, which is applied in the direction of measuring devices, using stable shear force to test the strength of materials, instruments, etc., can solve the problems of inability to meet the effective circulation of air and moisture, and achieve simple structure, Ease of use

Inactive Publication Date: 2018-01-19
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stress-free gauge is composed of a strain gauge and a stress-free barrel. The stress-free barrel is mainly composed of a thin iron sheet, which cannot satisfy the effective circulation of air and moisture inside the concrete. There must be a certain difference between the shrinkage and deformation of the actual concrete, and it needs to be used separately. Fixed and inconvenient

Method used

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  • Concrete structure combined strain monitoring unit and concrete state evaluation method
  • Concrete structure combined strain monitoring unit and concrete state evaluation method
  • Concrete structure combined strain monitoring unit and concrete state evaluation method

Examples

Experimental program
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Embodiment 1

[0052] Such as Figure 1 to Figure 4 As shown, a concrete structure combined strain monitoring unit includes a cube main body with a side length of 150-250mm, and a total of 18 vibrating wire strain sensors are arranged on each side of the cube main body and a diagonal line of each face 19. The two ends of each vibrating wire strain sensor are threadedly connected to the bolt ball joints 20 at the eight corners of the main body of the cube through connecting rods 22 and coil springs 21. The coil spring 21 has an elastic modulus much smaller than that of concrete, and can be used in Support the weight of the sensor and the connecting rod 22 without obvious deformation at the initial stage of installation, and facilitate the connection with the connecting rods 22 at both ends; the vibrating wire strain sensor 19 on the side is used to measure the tensile and compressive strains in three mutually perpendicular directions , the vibrating wire strain sensor 19 on the facing diagona...

Embodiment 2

[0074] A concrete state assessment method based on the combined strain monitoring unit of the concrete structure, comprising steps:

[0075] S1. Monitor the strain data of the sensors on the sides and surfaces of the cube main body through the data collector. Because the data measured by many vibrating wire sensors is the vibration frequency, it can be converted into strain data according to the conversion formula and calibrated parameters provided by the manufacturer;

[0076] S2, subtract the concrete temperature and shrinkage strain measured by the reference sensor from the strain data of the 18 vibrating wire strain sensors 19 monitored, to obtain the strain value of the stress generated by each vibrating wire strain sensor 19

[0077]

[0078] where i = 0, 1, 2, ... 18; ε i is the strain value directly measured by the vibrating wire strain sensor 19, ε 0 Concrete temperature and shrinkage strain measured by reference sensors;

[0079] S3. Construct the three-dimens...

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Abstract

The present invention discloses a concrete structure combined strain monitoring unit, which comprises a cube main body, wherein 18 vibrating wire strain sensors are arranged on the diagonal lines of each edge and each surface of the cube main body, both ends of each vibrating wire strain sensor are respectively connected to the bolt ball nodes positioned at eight top corner positions of the cube main body through connection rods and helical springs in a threaded manner, a cylindrical separation cylinder with an opening top portion is fixedly arranged in the cube main body, the cylinder wall ofthe separation cylinder sequentially comprises an elastic separation net, a water-permeation and gas-permeation layer and an elastic separation net from outside to inside, and a reference sensor formeasuring the concrete temperature and the shrinkage strain in the absence of a load is centrally arranged in the separation cylinder. The present invention further provides a concrete state evaluation method based on the combined strain monitoring unit. According to the present invention, with the concrete structure combined strain monitoring unit, the force applying on the concrete structure canbe accurately analyzed while the comparing to the index in the concrete failure criterion can be performed according to the requirement, and the possibility of concrete cracking can be evaluated.

Description

technical field [0001] The invention relates to a combined strain monitoring unit in an embedded concrete structure and a state evaluation method thereof, which are mainly used in health monitoring and evaluation of large-scale concrete structures under construction and operating conditions. Background technique [0002] Concrete structure is the most important architectural form in the contemporary civil engineering industry, and it bears many important functions. Once it is cracked and faced with various loads and deformations after completion, it will cause a lot of inestimable losses. Many important structures need to bury strain sensors in order to understand their health status during construction and operation in real time. [0003] Embedded sensors currently available for concrete strain monitoring are mainly divided into: (1) resistive sensors, sensitive elements based on the resistance-strain effect; (2) vibrating wire sensors, based on tensioned metal strings A r...

Claims

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Application Information

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IPC IPC(8): G01N3/24G01B21/32
Inventor 徐兆全范学明潘志刚
Owner SOUTH CHINA UNIV OF TECH
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