Abstract
This paper presents the practical results of the evaluation of the data obtained by using ground-based radar interferometer during measurements carried out on bridge structures. Due to the nature of the objects studied, the authors proposed a comprehensive method of data analysis, which identifies whether the passage of the vehicle did not damage the bridge. The effective use of vehicles as a source of bridge excitation allowed us to first develop a method for determining the damping parameters resistant to potentially occurring beating frequencies. As a result, it is possible to determine these subsets of data registered with radar, for which it is possible to assume compliance with linear systems. This type of data, often omitted in other works, forms the basis for the second important element of the research—an algorithm based on the ARMA model supporting defect detection. The optimization of the performed calculations, in particular the proposed optimal ARMA model order, the method of fault identification based on the DSF parameter, or fault identification based on a nonmetrical Cook’s distance leads to a robust and scalable method. The method’s low computational complexity allows for implementation in real-time solutions. In addition, the distribution of errors and the sensitivity of classifiers based on the DSF parameter and Cook’s distances leaving them will enable the automation of the classification process using machine learning. The proposed method is universal; in particular, it can be used for radar interferometry methods because it is resistant to potentially variable environmental conditions.
Highlights
In the group of objects that must be monitored during load tests and require monitoring are, among others, bridge structures and buildings exposed to the influence of seismic factors. e monitoring of such facilities and their examination under test loads should provide a basis for assessing the safety of the structure at the time of its commissioning and in the future
Attention should be paid to the radar interferometry technique that allows simultaneous observation of many elements representing the tested structure
E use of radar observations of many points on the site to analyze the health of the structure is quite wide. is type of research is carried out for both bridge and high-rise buildings by determining the vibration parameters based on dynamic displacement monitoring [1]
Summary
Many failures can be identified based on the analysis of observations carried out using various measuring devices In this group, attention should be paid to the radar interferometry technique that allows simultaneous observation of many elements representing the tested structure. Is work presents an algorithm for conducting research under testing or operational load that allows simultaneous observation which will allow for identifying any structural damage that may occur during testing and are the basis for building a reference database of the system based on SHM. An algorithm for detecting and automatically identifying the defects of buildings and structures is applied It is useful for engineering structures susceptible to dynamic excitations such as bridges, viaducts, flyovers, masts, and towers, as well as free-standing chimneys (single and multi-flue) based on tests carried out under testing or operational load.
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