A Basic Study to Develop Structural Deformation Measurement and Visualization System Using Ultrasonic Sensors

초록

A HC-SR04 ultrasonic sensor, which is inexpensive and widely used across various fields, was applied to monitor deformations such as displacement or strain in structural members. Up to four sensors were connected to a single board, forming one module, and these modules were arranged in a mat-shaped configuration and affixed to the measurement area. The ultrasonic sensor measured the distance between each module, and these values were used as the coordinate values for the modules. Sensor modules, including dummy modules, were placed at the location where shear cracks occurred in the concrete beam. This setup consisted of a total of 16 nodes, with the sensor module locations serving as nodes and forming nine rectangular elements. A finite element analysis using these nodes and elements was conducted to calculate the strain within the measurement area at each stage of the experiment. Subsequently, the process of visualizing the structure’s deformation was carried out. This setup could be used multiple times by attaching it to the area to be measured, allowing for the visual display of the concrete beam’s deformation at each load stage, which served as a test object. © 2023 by Korea Concrete Institute.

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