Test method for measuring concrete uniaxial tension damage evolution equation based on sound emission technology

Abstract

The invention discloses a test method for measuring concrete uniaxial tension damage evolution equation based on sound emission technology. The sound emission technology is used for monitoring the change of the released strain energy in the process of completely forming a fracture process zone from the occurring of the concrete microscopic crack, thereby reflecting the material damage evolution process corresponding to a concrete tension stress-strain full curve; and a function expression of the uniaxial tension damage evolution process is obtained by fitting experimental data. The model can reliably predict an intensification section, a softening section in the stress-strain curve in the concrete uniaxial tension and the rigidity degradation under loading / unloading effect. The method disclosed by the invention has important application value for developing the concrete constitutive theory and the test research thereof.

Description

technical field [0001] The invention relates to a mechanical parameter—a test and measurement method for the uniaxial tensile damage evolution equation of concrete, in particular to a test method for measuring the concrete uniaxial tensile damage evolution equation based on acoustic emission technology. Background technique [0002] Concrete damage constitutive relation is the basic theory of concrete structure analysis and engineering design, which plays a key role in accurately simulating the nonlinear mechanical behavior of concrete structure. The uniaxial tensile stress-strain relationship of concrete is generally determined by uniaxial tensile tests, but concrete is significantly brittle, which makes it difficult to obtain the softening section in the stress-strain relationship of concrete by uniaxial tensile tests. At the same time, there is still a lack of methods to measure the damage evolution of concrete under uniaxial tension through experiments. [0003] Since t...

AI Technical Summary

Problems solved by technology

The uniaxial tensile stress-strain relationship of concrete is generally determined by uniaxial tensile test, but concrete has significant brittleness, which makes it difficult to obtain the softening section in the stress-strain relationship of concrete by uniaxial tensile test

At the same time, there is still a lack of methods to measure the damage evolution of concrete under uniaxial tension through experiments.

Images