Non-contact methods of studying impact effects on load-bearing span structures

by

V.A. Nurzai1, F.A. Gubarev1, P.A. Elugachev2, A.A. Bannikov2, A.V. Mostovshchikov2

1Sevastopol State University, RF, Sevastopol, Universitetskaya St., 33

2Tomsk State University of Architecture and Building, RF, Tomsk, Solyanaya Sq., 2

 E-mail: VANurzai@sevsu.ru

DOI: 10.33075/2220-5861-2025-2-29-41

UDC 624.21.09-047.36                 

EDN: https://elibrary.ru/gsgxne

Abstract:     

The article presents the results of computer modeling and physical experiments aimed at determining the eigenfrequencies of vibrations and the response to the impact for a model of a road bridge. The vertical impact caused by the passage of vehicles along the bridge span was modeled. Eigenfrequency and Time-Dependent, Modal analyses were performed for the model built in the COMSOL Multiphysics environment. The eigenfrequencies of vibrations of the structure were determined. The impact was replaced by an equivalent vertical impact in the form of a half-sine pulse of 6.058*g with a duration of 10 μs. In physical experiments, the results of the impact when dropping a load weighing 30 kg from a height of 0.2 m into the center of the span together with static loading by two concrete blocks were considered. In the experiments, two contactless optical measurement methods were used simultaneously to compare the results: the photomodulation method using holographic films and the laser speckle correlation method, which give the results of displacements in relative units – brightness bits and image displacement pixels, respectively. The results were controlled using a certified vertical displacement measuring system “FAZA-1T”, showing the absolute displacement of the surface over time. The article will be of interest to specialists in vibration control of road structures.

Keywords: photomodulation method, laser speckle correlation method, vibration measurement, bridge vibration, remote sensing

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