Method for testing concrete uniaxial tensile stress strain relationship through sound emission

Abstract

The invention discloses a method for testing concrete uniaxial tensile stress strain relationship through sound emission. The method comprises the following steps: performing three-point bending fracture test on a concrete beam, and monitoring material damage and strain development in the crack development and evolution process in a fracture process area by using a sound emission tester and a strain tester respectively; according to the initial gap length, the critical fracture process area length, the loading total time and the fracture initiation time, determining the time t required by thewhole destruction process of the first critical fracture process area; according to the sound emission characteristic of material damage and evolution within the time t, fitting a relation expressionbetween a material damage factor and fracture process area strain development within the time t and establishing a damage factor expression taking strain as internal variable so as to obtain a concrete uniaxial tensile stress strain relationship model. The method provided by the invention has important application value in developing concrete constitutive theory and test research thereof.

Description

technical field [0001] The invention relates to a concrete structure damage monitoring method, in particular to a method for acoustic emission testing of concrete uniaxial tensile stress-strain relationship. Background technique [0002] The stress-strain relationship of concrete is the basic theory of concrete structure analysis and engineering design, and plays a vital role in correctly evaluating the nonlinear mechanical behavior of concrete structures. At present, the one-dimensional damage constitutive model is relatively complete, but there is a lack of effective test methods to quantitatively monitor the evolution of material damage, that is, the concrete damage constitutive theory lacks corresponding test observation methods. [0003] The tensile stress-strain test method of concrete generally adopts the three-point bending fracture test, and the tensile stress-strain relationship is established with the concept of macroscopic fracture energy, ignoring the whole proc...

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Problems solved by technology

At present, the one-dimensional damage constitutive model is relatively complete, but there is a lack of effective test methods to quantitatively monitor the evolution of material damage, that is, the concrete damage constitutive theory lacks corresponding test observation methods

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