Modern measurement methods in strength tests of sigma thin-walled steel beams

¹ Lublin University of Technology, Faculty of Civil Engineering and Architecture, ul.Nadbystrzycka 38d, 20-618 Lublin
² Poznan University of Technology, Institute of Structural Engineering, Marii Skłodowskiej-Curie 5, 60-965 Poznań, Poland

^* Corresponding author: i.szewczak@pollub.pl

Abstract

In the paper the modern measurement methods of structural deformation using GOM optical measuring systems based on digital image processing were presented. First part of the work demonstrates the results of measurement of initial geometrical imperfections of steel structural elements using the Tritop optical 3D coordinate measuring machine. The method of preparation of sigma type steel beams with a height of 200 mm, a flange width of 70 mm and a wall thickness of 2 mm is presented. Afterwards, the subsequent stages of measurements and the method of reading the obtained results and their interpretation are described. The next step presents a test stand designed to perform strength tests of thin-walled sigma beams in a four-point bending scheme. In addition, the method of preparation of beam’s surface to measurement of 3D using the Aramis system and electrofusion strain gauges is presented. The deformation values obtained for three sigma-type steel beams were compared with respect of two mentioned measurement methods. The final conclusions and recommendations regarding the methodology of geometry and strain measurement using optical measuring systems complete the work.