Method for studying material mechanics behaviors of concrete crack process zone

Abstract

The invention discloses a method for studying material mechanics behaviors of a concrete crack process zone. The method includes the steps that original-level concrete samples are manufactured, a crack is prefabricated in the top of each sample, and a steel block is bonded to each crack; the overall dimensions of the samples and the masses of wedge-shaped loading frames are measured; strain gages are arranged on the two sides of the pointed end of the prefabricated crack of each sample; the positions of quartile points are marked at the bottom of each sample; each sample is installed on a testing machine through loading pulleys along with the corresponding wedge-shaped loading frame; a knife edge thin steel plate is installed in the middle of each prefabricated crack; loading is carried out on each sample through the testing machine, and data are collected through a dynamic strain indicator while loading is carried out; images are collected through a high-accuracy CCD camera till the samples are damaged; the collected data and the collected images are processed and analyzed, and analysis results are obtained. According to the method, as the optical method DIC technology is combined with a traditional electrical testing method, the crack initiation toughness of concrete is determined, and harmful cracks of a new concrete structure are effectively prevented.

Description

technical field [0001] The invention relates to a method for studying the mechanical behavior of materials in a concrete fracture process area based on electrical and optical measurement methods, in particular to a method for studying the mechanical behavior of materials in a concrete fracture process area, which belongs to the technical field of concrete fracture damage analysis. Background technique [0002] Cracks in concrete structures are difficult topics in architectural research. The development of its design theory system can be roughly divided into three stages: fracture mechanics analysis stage, plastic analysis stage, and elastic analysis stage; The science to efficiently and rationally analyze the response of concrete structures. [0003] For half a century, researchers at home and abroad have successively proposed fracture models suitable for concrete nonlinear materials, such as virtual crack model, dual-parameter fracture model, double-K fracture model, etc. A...

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Problems solved by technology

[0004] At present, there is no special equipment for digital detection and analysis that has the potential to be widely used in the detection methods of structural cracks in China; although some concrete crack detectors have come out, most of these instruments are composed of voltage regulators, sensors, and display devices. , which is mainly aimed at the detection of large concrete buildings, such as the inspection of the internal concrete pouring of structures such as dams, large aqueducts, and bridges, and the inspection of external cracks in general civil buildings. Therefore, in this case, there is an urgent need for a time-saving, labor-saving, efficient, accurate, low-cost, automatic detection method to replace the traditional method, and the combination of electrical measurement and optical measurement is just a effective and practical approach

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