Concrete stress-strain full-curve test apparatus and working method

Abstract

The invention discloses a concrete stress-strain full-curve test apparatus and working method. A square sleeve is used as a test piece clamp to be clamped between two ends of a test piece. On one hand, a displacement sensor can be more firmly fixed on the test piece, and when the test piece is instantaneously damaged, the movement of the displacement sensor can be effectively prevented from influencing a test result; and on the other hand, the square sleeve is made of a high-strength steel material, and under the condition of transverse deformation of the test piece, the test data can be prevented from being influenced by the stress deformation. The concrete stress-strain full-curve test apparatus is simple in structure, reasonable in design, easy in operation, firm, unlikely to deform andcapable of being used circularly for a long time. When the test piece is under the stress, the test piece is greatly deformed in the transverse direction, so that an ordinary test clamp is likely todeform under the squeezing to influence the secondary use; however, the concrete stress-strain full-curve test apparatus is made of the high-strength steel plate, so that the deformation is unlikely to occur, the repeat test can be carried out, and the test result is accurate.

Description

Technical field [0001] The invention belongs to the field of construction engineering test detection, and specifically relates to a concrete stress-strain full curve test device and a working method. Background technique [0002] In recent years, high-performance concrete has been rapidly developed and used in many practical engineering projects. High performance concrete has many excellent characteristics such as high durability, high workability, high strength and high volume stability, and has been adopted in many important projects so far. Because of the high strength and brittleness of high-performance concrete, the uniaxial compression failure stress-strain full curve test device of ordinary concrete cannot be applied to high-performance concrete, and the falling section of the stress-strain curve of high-performance concrete cannot be obtained. At present, there is no suitable testing device for testing the full stress-strain curve of high performance concrete under uniax...

AI Technical Summary

Problems solved by technology

[0003] For the test of failure strain, if the method of attaching strain gauges is used, the deformation of the whole process of failure of high-performance concrete cannot be obtained due to the limitation of the strain gauge range.

At present, there is also a method of adding rigid components to obtain the descending section of the stress-strain curve, but this method requires repeated centering, the test efficiency is low, and ideal test results cannot be obtained.

In addition, there is a ring-shaped support test device, but the high-performance concrete has a high failure strength, and the energy is released instantaneously at the moment of destruction. The ring-shaped support cannot guarantee the stability of the displacement meter and cannot obtain accurate displacement data.

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