Existing structure concrete fatigue residual strain testing method based on deformation modulus

Abstract

The invention provides an existing structure concrete fatigue residual strain testing method based on a deformation modulus. An actual concrete stress-strain curve is established through testing and analyzing mechanical parameters of concrete on a representative secondary stress component; at a maximum compressive strain part of a key section of a main stress component, a concrete unloading / reloading deformation modulus is tested; static-force equivalent strain and static-force equivalent stress corresponding to the concrete unloading / reloading deformation modulus are calculated according to a strain equivalent principle, so that concrete fatigue residual strain is obtained. By adopting the existing structure concrete fatigue residual strain testing method provided by the invention, the technical problem that the residual strain cannot be obtained by a traditional field testing method is solved, and stressed concrete damage degree evaluation standards, concrete static-force equivalent strain indexes and concrete post-damage predicted strength based on the residual strain,are given.

Description

technical field [0001] The invention relates to the technical field of engineering detection, in particular to a method for testing residual strain of existing structural concrete based on unloading / reloading deformation modulus. Background technique [0002] In actual engineering, concrete structures are often subjected to repeated loading and unloading fatigue loads during their service life, and concrete damage is reflected in the magnitude of residual strain and total strain macroscopically, which has nothing to do with the action history of external loads. Due to the representativeness and stability of residual strain to characterize concrete damage, it is recognized as one of the key parameters for evaluating the damage state of concrete structures, and it is suitable for concrete of various strength levels. However, there are still difficulties in its on-site testing and analysis, mainly in the following aspects: [0003] (1) At present, the test and analysis of the ...

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Problems solved by technology

[0007] The invention relates to a method for testing the fatigue residual strain of existing structural concrete based on the deformation modulus, and aims to solve the technical problem that the existing method cannot obtain the residual strain of the concrete, so that the cumulative damage state of the concrete structure cannot be quantitatively evaluated

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