Experience of application of vibroacoustic analysis to testing of a reinforced concrete bridge on the Dnister river in v. Zalisky
Abstract
A methodology has been developed for the application of vibro-acoustic diagnostics of the technical condition of bridges and their structural elements when carrying out static and dynamic tests of bridges by improving filtering methods and highlighting wavelet transform signal trends.
The object of study is the process of static and dynamic testing of bridges and their structural elements using acoustic emission diagnostics of a technical condition.
The subject of the study is the nature of the development of the process of deformation of reinforced concrete bridge spans under the influence of static and dynamic test loads.
The purpose of the study is to improve the reliability and reliability of the results of static and dynamic tests of bridges using acoustic emission diagnostics of their condition by improving filtering methods and highlighting wavelet transform signal trends. The use of the method of vibro-acoustic emission based on the wavelet transform provides the determination of the characteristics of the formation of acoustic pulses, the determination of the growth and extinction of their amplitudes and the change in frequency characteristics over time. The advantages of using wavelet transform are the possibilities of software implementation of removing noise from the signal and highlighting certain frequency components of the signal as independent components. The equipment for measuring and fixing signals of vibroacoustic emission was developed, which consists of a four-channel recording unit, an external analog-to-digital conversion module, a control laptop, and a size range of wideband piezoelectric transducers integrated on neodymium magnets. The developed vibroacoustic analysis was tested during static and dynamic tests of a reinforced concrete bridge across the river Dniester on the highway M-12, km 28 + 964 near the village Zaliski. The established values of the oscillation frequency of the run beams is the passport characteristics of the bridge and how the input values are used to assess the degree of wear of the span structure during operation. The developed methodology and equipment for vibro-acoustic diagnosis of the technical condition of bridges and their structural elements are recommended for use in related fields, including for the diagnosis of structures and building structures to be tested.
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