Test piece of concrete direct tensile test, test piece forming die and integrated equipment

Abstract

The invention discloses a test piece of a concrete direct tensile test, a test piece forming die and integrated equipment. According to the invention, the test piece of the concrete direct tensile test, the test piece forming die of the concrete direct tensile test and the integrated equipment of the concrete direct tensile test are provided; the test piece of the concrete direct tensile test is a square-cross section equal thickness dumbbell-type tension test piece; the test piece forming die of the concrete direct tensile test comprises a side mold framework and a base plate, the side mold framework is formed by performing butt joint on two linked side plates; and the integrated equipment of the concrete direct tensile test comprises a loading framework, a loading mechanism, a test piece tensioning clamper, a test piece deformation test clamp and a data acquisition system. The Test piece of concrete direct tensile test, the test piece forming die and the integrated equipment have the advantages of reasonable design, simple structure, environmental protection, high efficiency and accurate testing.

Description

technical field [0001] The invention relates to the technical field of engineering testing and testing, in particular to a concrete direct tensile test specimen, a specimen forming mold and a complete set of equipment. Background technique [0002] Concrete direct tensile test is an important technical means to accurately obtain a series of tensile parameters such as concrete tensile strength, ultimate tensile value and tensile modulus of elasticity, which provides an important basis for concrete structure design, theoretical analysis and performance evaluation. However, there is no ideal test method and device for direct tensile test of concrete at present, and the uniaxial tensile strength of concrete is mostly obtained through indirect tensile test or through empirical formula conversion with compressive strength. Indirect tensile test methods for concrete, such as splitting tensile strength and flexural tensile strength, are relatively simple, but they are not strictly s...

AI Technical Summary

Problems solved by technology

Although the fixture provided by this invention can clamp and tensile test the eight-shaped concrete specimen, the practice shows that the success rate of the test is very low, that is, the fracture of the specimen is almost all at the variable section, and it is difficult to occur at the predetermined failure. Within the range, the obtained test results cannot reflect the essential characteristics of concrete random fracture

Since a reasonable solution cannot be given in terms of the type of specimen and the design method of the tension and clamping fixture of the specimen, it is difficult to avoid the stress concentration at the variable section of the specimen, and it is impossible to obtain more valuable test results. Therefore, it is necessary to Develop a specimen type and a complete set of equipment that is reasonable in structure, convenient in operation, and can accurately test the direct tensile properties of concrete, and is convenient for direct tensile tests on ordinary testing machines

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