Method for measuring internal stress of concrete structure

A technology of concrete structure and internal stress, which is applied in the measurement of force, the measurement of force by measuring the frequency change of the stressed vibration element, the measurement device, etc., can solve the problems of difference, stress detection error of concrete members, etc. Effect

Active Publication Date: 2022-01-11
THE THIRD CONSTR CO LTD OF CHINA CONSTR THIRD ENG BUREAU +1
View PDF17 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, when measuring the stress in concrete members, due to the real-time changes in the concrete hydration heat temperature, the strain measured by the vibrating wire strain gauge is actually the superposition of the actual strain of the concrete and other corrected deformations. There is a certain difference between the different strains of the concrete member and the actual strain of the concrete member, which leads to a certain error in the stress detection inside the concrete member

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring internal stress of concrete structure
  • Method for measuring internal stress of concrete structure
  • Method for measuring internal stress of concrete structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0046] The following is attached Figure 1-12 The application is described in further detail.

[0047] The embodiment of the present application discloses a method for measuring internal stress of a concrete structure. refer tofigure 1 and figure 2 , a method for measuring the internal stress of a concrete structure comprises the following steps:

[0048] Detect elastic modulus: use concrete with the same ratio as the concrete component to make the first concrete sample 1, and perform the same maintenance as the concrete component on the construction site, conduct an ultrasonic test through a non-metallic ultrasonic detector 11, and measure the first concrete sample 1 Tensile modulus E of different ages (t) ;

[0049] The specific steps are as follows: the first concrete test piece 1 is produced in multiples, three are set in the embodiment of the present application, and the specification of the first concrete test piece 1 is 550*100*100mm, the first concrete test piece ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a method for measuring internal stress of a concrete structure, which comprises the following steps of: detecting elastic modulus: manufacturing a first concrete test piece by adopting concrete with the same proportion as a concrete member, and measuring tensile elastic modulus E (t) of the first concrete test piece at different ages; detecting a strain difference: detecting a differential strain epsilon difference (t) between the first vibrating wire strain gauge and the concrete members at different ages; detecting the comprehensive strain of the concrete member; measuring the comprehensive strain epsilon < comprehensive > (t) of each point of the concrete member; and detecting the internal stress of the concrete member: rejecting the differential strain epsilon difference (t) caused by the difference between the first vibrating wire strain gauge and the thermal expansion coefficient of the concrete from the measured comprehensive strain epsilon set (t), and then combining the tensile elastic modulus E (t) of the concrete member at different ages to obtain the internal stress of the concrete member at different ages. According to the invention, errors of internal stress detection of the concrete member can be effectively reduced.

Description

technical field [0001] The application relates to the field of engineering detection methods, in particular to a method for measuring the internal stress of a concrete structure. Background technique [0002] Due to the heat of hydration of concrete, its own volume deformation, shrinkage and creep, and the influence of external temperature changes, concrete members will expand and shrink, and the deformation of concrete members is constrained by surrounding members, such as shear walls or concrete columns. , cannot be freely strained to generate stress in the concrete member. When the stress in the concrete member is greater than the tensile strength of the concrete member, the concrete member will appear cracks. Therefore, it is necessary to detect the stress inside the concrete member before and after the construction to reflect the internal situation of the concrete member. [0003] When detecting the internal stress of concrete members, some calculation formulas can be...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/10G01L1/25
CPCG01L1/10G01L1/255
Inventor 毕洋洋史阳李颖胡万青陈革平王渝
Owner THE THIRD CONSTR CO LTD OF CHINA CONSTR THIRD ENG BUREAU
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products