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Concrete compressive failure stress-strain full curve test device

A technology of breaking stress and testing equipment, which is applied to measuring equipment, using stable tension/pressure to test the strength of materials, instruments, etc., can solve the problems of failure to obtain test results, pressure damage of displacement gauges, displacement of upper and lower ring brackets, etc. problems, to achieve the effect of improving test efficiency and test effect, ensuring plane stability, and ensuring accuracy

Active Publication Date: 2017-09-15
ZHENGZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the practical application shows that the device still has shortcomings: because it adopts two sets of setscrews and four clamping points to clamp the specimen vertically and symmetrically, it can completely guarantee the vertical deformation of completely homogeneous elastic materials. Test accuracy, but concrete is a heterogeneous material. Once the specimen is compressed and produces lateral deformation, if there is a difference in the lateral deformation of the concrete in the two vertical directions, two results may occur: one situation is that if the reinforcement is not too tight It is possible to make a group of set screws in the vertical direction deviate from the original position, so that the upper and lower ring brackets will be displaced, so that accurate test results cannot be obtained; another situation is that if the clamping is too tight, the lateral deformation of the specimen will cause extrusion. The pressure may deform or even destroy the upper and lower annular brackets, and bring errors to the test results
When measuring the compression deformation of the test piece, this kind of device also adopts the clamping measurement method, which also has the risk of causing the displacement gauge to be damaged under pressure.
Although this device can meet the needs of testing the elastic modulus of plastic concrete within a certain range, it cannot be used to test the full stress-strain curve of concrete when it is damaged under compression
[0005] In the research on the compressive performance of concrete, it is sometimes necessary to add rigid components in order to obtain a better full-curve descending section. To measure the real load on the specimen, it is necessary to make a load sensor clamping fixture. During the test, the specimen must be repeated. All unreasonable designs will make the test efficiency very low, and may not be able to obtain ideal test results

Method used

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  • Concrete compressive failure stress-strain full curve test device
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  • Concrete compressive failure stress-strain full curve test device

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: see figure 1 , figure 2 , image 3 , Figure 4 , Figure 5 and Figure 6 , figure 1 The concrete compressive stress-strain full curve testing device in this embodiment includes a loading fixture, a specimen deformation testing fixture and a data acquisition and processing system. Specifically, it consists of top plate 1, ball hinge 2, ball hinge connector 3, force transmission plate 4, spring 5, slide rod 6, load sensor 7, pressure plate 8, pillar 9, test piece 10, rubber pad 11, and L-shaped test piece positioning. Plate 12, position adjustment screw 13, specimen positioning seat 14, bottom plate 15, fixed clamping nail 16, butterfly bolt 17, deformation sensor ejector rod 18, deformation sensor upper bracket 19, movable clamping nail 20, baffle plate 21, Clamping nail compression spring 22, computer 23, controller 24, longitudinal deformation sensor 25, lateral deformation sensor 26, deformation sensor middle bracket 27, lateral deformation sensor...

Embodiment 2

[0044] Example 2: see Figure 7 , the concrete compressive stress-strain full curve test device of the present embodiment is completely the same as that of the embodiment 1 in the loading fixture and data acquisition and processing system, and its specimen deformation test fixture is different from the characteristics of the embodiment 1 in that: in the deformation sensor The bracket fixing frame is provided with a movable clamping nail, and the outside of the right limb is fixedly connected with a movable clamping nail limiting frame. The right side of the frame is fixedly connected to the clamping frame of the lateral displacement meter. The outer frame of the clamping frame corresponds to the top plate of the lateral displacement meter. is the mean value of the two lateral displacement sensors.

Embodiment 3

[0045] Embodiment 3: see Figure 8, this embodiment is exactly the same as Embodiment 1 and Embodiment 2 in terms of the loading fixture and data acquisition and processing system, and its difference from Embodiment 1 and Embodiment 2 is that the lateral deformation sensor is clamped on the limit frame On the outer frame, the top bead of the measuring end of the lateral deformation sensor is pushed against the top plate connecting the two movable clamping nail baffles. The movable clamping nails are connected by shafts, which can ensure the independence of the two movable clamping nails, and can measure the lateral deformation of the specimen at the same time.

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Abstract

The invention relates to a concrete compression breaking stress-strain total curve testing device. The device comprises a loading clamp, a test-piece deformation testing clamp and a data collecting and processing system, wherein a tested test-piece is arranged in the loading clamp; the test-piece deformation testing clamp clamps the tested test-piece and is connected with the data collecting and processing system. The concrete compression breaking stress-strain total curve testing device is reasonable in design, simple in structure, convenient to operate, environmentally friendly, efficient, accurate in testing result and easy to promote and implement.

Description

technical field [0001] The invention relates to a concrete compression failure stress-strain full curve testing device, which belongs to the technical field of construction engineering testing and detection. Background technique [0002] Concrete is the most widely used building material in modern construction engineering, and the formed reinforced concrete structure is also the main type of engineering structure. The stress-strain full curve of concrete under uniaxial compression failure is one of the basic bases for the rational design of reinforced concrete structures and the study of their strength and deformation behavior, especially for the analysis of the whole elastic-plastic process of structural members. Sectional stress distribution, analysis of ductility and restoring force characteristics of anti-seismic and anti-explosion structures, etc. However, at present, there is no suitable test device for testing the full stress-strain curve of concrete under compressio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/04G01N3/08
Inventor 汤寄予高丹盈赵军齐新华王四巍赵顺波张龑陈刚吕铭艳
Owner ZHENGZHOU UNIV
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