Method for monitoring damage of concrete structure based on piezoelectric intelligent aggregate

Abstract

The invention discloses a method for monitoring the damage of a concrete structure based on piezoelectric intelligent aggregate. The method comprises the following steps: designing a piezoelectric intelligent aggregate sensor and a driver which are independently packaged; and establishing a damage statistical index of the concrete structure based on wavelet analysis and a method for determining the damage degree, the damage probability and the damage position, and providing a statistical recognition algorithm for the damage of the concrete structure of the piezoelectric intelligent aggregate based on wavelet analysis. According to the method disclosed by the invention, the influences of partial test errors are eliminated to a certain degree, and the uncertainty of a damage identification problem is well reflected and is converted into mathematical description in the probability statistical significance, so that the problem of uncertainty of the damage identification is effectively solved, the damage degree and damage probability of the concrete structure can be determined, and the rough position (range) of the damage can be effectively recognized.

Description

technical field [0001] The invention relates to the field of civil engineering, in particular to a method for monitoring damage to concrete structures based on piezoelectric intelligent aggregates. Background technique [0002] With the development of civil engineering structures in the direction of large-scale, complex and intelligent, the theoretical methods, experimental research and engineering application of concrete structure health monitoring and damage identification have become the focus of academic research. Piezoelectric smart materials, such as lead zirconate titanate (Piezoelecrtric Lead Zirconate Titanate, referred to as PZT), have the superior characteristics of sensing and driving, and their applications are long-term health monitoring and qualitative and quantitative overall status of major engineering structures and infrastructure Damage identification technology provides a new way of thinking. By effectively processing massive uncertain measurement data a...

AI Technical Summary

Problems solved by technology

The deterministic method is to deal with structural damage problems with essential uncertainties under the ideal conditions of ignoring the influence of some uncertain factors, which is not conducive to detecting damage in the early stage, resulting in the actual structural state even if no degradation occurs. Changes in monitoring results

Therefore, it is difficult to distinguish whether the change of the monitoring signal is caused by structural damage or the change of environmental factors and operating conditions, which leads to the contradiction between the theoretical method and practical application, the contradiction between the damage identification model and the actual problem, and causes the damage identification accuracy to decline. Or the damage degree is misjudged, and the monitoring data cannot truly reflect the actual health status of the structure, which hinders the practical application of structural health monitoring and damage identification methods based on piezoelectric intelligent sensors / drivers

Images