Issue 48

V. M. G. Gomes et alii, Frattura ed Integrità Strutturale, 48 (2019) 304-317; DOI: 10.3221/IGF-ESIS.48.30 304 Focused on the “Portuguese contributions for Structural Integrity” Monotonic and fracture behaviours of bolted connections with distinct bolt preloads and surface treatments Vítor M.G. Gomes Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal vtgomes@fe.up.pt , https://orcid.org/0000-0002-3982-6913 Mariana Rodrigues INEGI, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal mfrodrigues@inegi.up.pt José A.F.O. Correia, Miguel A.V. Figueiredo, Abílio M.P. de Jesus, António A. Fernandes INEGI/ Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal jacorreia@inegi.up.pt , https://orcid.org/0000-0002-4148-9426 mfiguei@fe.up.pt , https://orcid.org/0000-0002-6425-4339 ajesus@fe.up.pt , https://orcid.org/0000-0002-1059-715X aaf@fe.up.pt, https://orcid.org/0000-0002-7146-9944 A BSTRACT . This paper presents a research about the monotonic and failure behaviours of bolted joints made of thin plates of S350GD and S355MC steels grades applied for rack structures. A full factorial matrix of static monotonic tests was performed considering two joints configurations, two material thicknesses, three surface coatings and two preload levels. Slip tests were also performed according to the EN 1090-2 standard to evaluate joint slip factors for the three material surface conditions. Numerical simulations of static tests were also performed using J2 plasticity and compared with experimental data. From experimental results, it is verified that increasing thickness and preload results an increasing of failure loads and sliding loads, respectively. Slip tests revealed the lowest slip factors for the painted specimens, followed by uncoated specimens and the higher slip factor was verified for zinc-coated specimens. Regarding failure modes, it verified that the S355MC specimens with single connection fractured by shear, while the S350GD specimens fractured from splitting and shear. In addition, for specimens with multiple connections for both materials, the failure occurred in net cross-section. The FE results reproduced conveniently the ultimate loads as well as the failure modes, including the clamping and friction effects. K EYWORDS . Rack Structures; Bolted Joints; Monotonic Behaviour; Friction; Numerical Simulation. Citation: Gomes, V.M.G., Rodrigues, M., Correia, J.A.F.O., Figueiredo, M.A.V., Jesus, A.M.P., Fernandes, A.A. Monotonic and Fracture Behaviours of Bolted Connections with Distinct Bolt Preloads and Surface Treatments, Frattura ed Integrità Strutturale, 48 (2019) 304-317. Received: 02.10.2018 Accepted: 07.12.2018 Published: 01.04.2019 Copyright: © 2019 This is an open access article under the terms of the CC-BY 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.