A Method for Studying the Mechanical Behavior of Materials in the Concrete Fracture Process Zone

Abstract

The invention discloses a method for studying the mechanical behavior of materials in the concrete fracture process area. By making primary concrete specimens, prefabricating cracks on the top of the specimens and bonding steel blocks; measuring the external dimensions of the specimens and the quality of the wedge-shaped loading frame; Set strain gauges on both sides of the tip of the prefabricated crack; mark the position of the quarter point at the bottom of the specimen; install the specimen on the testing machine through the loading pulley together with the wedge-shaped loading frame; install a knife-edge thin steel plate in the middle of the prefabricated crack; pass through the testing machine Load the test piece, while loading, the dynamic strain gauge collects data; the high-precision CCD camera collects images; until the test piece is destroyed; the collected data and collected images are processed and analyzed to obtain the analysis results. The invention combines the optical measurement DIC technology with the traditional electrical measurement method to determine the crack initiation toughness of the concrete and effectively prevent the occurrence of harmful cracks in newly-built concrete structures.

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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