Application of digital image correlation to the analysis of displacement field of thin-walled steel sigma beams reinforced with carbon fiber fabric

<ns3:p>This paper presents the results of laboratory tests obtained using the ARAMIS 6M digital image correlation method. The displacement measurement and deformation assessment were carried out for CFS beams with a cross-section of 200×70×2 and a span of 2700 mm, made of S350GD steel, reinforced and unreinforced (reference), loaded in a four-point bending scheme. The beams were reinforced with SikaWrap 230 C fabric glued to the edge stiffeners using SikaDur 330 adhesive. The tests were carried out for two cases, i.e., with the possibility of cross-section deplanation at the supports and for the lack of deplanation at the supports. Based on the obtained results, it was found that in the case of vertical and horizontal displacements, the use of the proposed reinforcement has a particularly beneficial effect for the case when there is no possibility of cross-section deplanation at the supports.</ns3:p>