Concrete compression breaking stress-strain total curve testing device

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...

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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

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