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 in...

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