Apparatus and test method for testing three-dimensional stress state inside concrete

Abstract

The invention provides a device and a test method for testing a three-dimensional stress state in concrete, a three-dimensional testing device is buried in the concrete and is connected with a data acquisition system, uniaxial stress detectors of the three-dimensional testing device are arranged in mutual independent normal directions on the surface of a core substrate, data wires of the six uniaxial stress detectors are gathered and exported through a core substrate internal hole and are connected with the data acquisition system. A substrate fixed link is arranged in a normal direction of the bottom surface of the core substrate. The test method for testing the three dimensional stress state in concrete is also provided. A beneficial effect comprises: a technical limitation that only a stress detector is set on the surface of the concrete to test a surface stress and further calculate an internal stress is broken. If the precision of the uniaxial stress detector is p, after calculated, 1.0p of the test precision of three primary stresses is obtained, 1.22p of the test precision of the three shearing stresses is obtained, and 1.11p of the average test precision is obtained. The improvement of the precision can more accurately reflect the stress state of the concrete construction, and the engineering safety stock is improved.

Description

technical field [0001] The invention belongs to the field of engineering stress testing, and relates to a device for testing the three-dimensional stress state of concrete and a testing method thereof, which can be used for stress monitoring inside large concrete. Background technique [0002] In order to ensure the safety and rationality of the project, it is necessary to test the stress distribution of the structure and the stress distribution and maximum stress value of the dangerous interface of the material. For example, in the construction and use of large-scale concrete facilities such as civil engineering, water conservancy engineering, and bridge engineering, accurate and intuitive acquisition of the stress state inside the concrete, so as to strengthen and repair the project, is an effective means of preventing problems before they happen. [0003] Stress testing can be done with strain gauges or manometers. If one wants to obtain the stress value in a certain dir...

AI Technical Summary

Problems solved by technology

[0004] At present, the main problems in the field of engineering stress testing are: the lack of real-time monitoring of stress during the construction and use of large concrete structures, the lack of application of the Internet of Things system during use, and the high cost of testing concrete structures; The data obtained by the directional stress test technology is not systematic, and the three-dimensional stress state cannot be evaluated; the research results of the three-dimensional strain rosette can be used to obtain the three-dimensional strain state of a point in the medium, but there must be many deficiencies in calculating the stress according to the strain; and in concrete 3D stress testing techniques have not been seen in the literature

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