Reinforced concrete structure crack type judgment method based on moment tensors

Abstract

The invention discloses a reinforced concrete structure crack type judgment method based on moment tensors. According to the method, a load is applied to a reinforced concrete flexural member, and meanwhile acoustic emission signals during crack generation are collected to obtain the amplitude of P-wave initial motion; based on mathematical analysis and a mechanical model, feature values of the moment tensors of different crack types are analyzed, the feature values are decomposed into a shear model part, a tension model deviator part and an isotropous part, and a crack type evaluation standard is established; the collected crack amplitude is substituted into a moment tensor equation set, and the moment tensors of corresponding cracks are obtained; and the feature values of the moment tensors of the cracks are subjected to normalization processing, and the crack type is judged according to the crack type evaluation standard. Through the method, by combining mathematical analysis and the mechanical principle, the type of the cracks generated by the concrete member under stress can be judged by means of acoustic emission, the generation mechanism of the cracks is analyzed, and a newway and method are provided for health monitoring and disaster early-warning on a reinforced concrete structure.

Description

Technical field [0001] The invention belongs to the technical field of acoustic emission monitoring, and particularly relates to a method for judging the type of cracks in reinforced concrete structures based on a moment tensor. Background technique [0002] Acoustic emission (AE) testing technology is an important dynamic non-destructive testing method, mainly by collecting the instantaneous elastic wave generated by the rapid release of local strain energy inside the material to judge the damage degree inside the structure. Combine the theory of inverting the focal mechanism of the moment tensor in seismology with the acoustic emission method in non-destructive testing, and introduce it into civil engineering to invert the damage mechanism of materials or structures. In the acoustic emission based on the moment tensor In terms of technical research, most of them only focus on plain concrete materials or mortar test blocks, and rarely involve reinforced concrete structures. Rei...

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Problems solved by technology

Combining the theory of moment tensor inversion of seismic source mechanism in seismology with the acoustic emission method in nondestructive testing, and introducing it into civil engineering to invert the damage mechanism of materials or structures, the acoustic emission method based on moment tensor In terms of technical research, most of them are only researched on plain concrete materials or mortar test blocks, and few involve reinforced concrete structures.

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