Durability Behaviour of Notched Steel Beam Strengthened with Prestressed CFRP Plate


Deng J., Li J.

10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in Civil Engineering (CICE), İstanbul, Turkey, 8 - 10 December 2021, vol.198, pp.2277-2286 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 198
  • Doi Number: 10.1007/978-3-030-88166-5_197
  • City: İstanbul
  • Country: Turkey
  • Page Numbers: pp.2277-2286
  • Keywords: CFRP, Notched steel beam, Prestress loss, Wetting/drying cycles, Fatigue damage, Flexural behavior, METALLIC BEAMS, FATIGUE
  • Istanbul Technical University Affiliated: No

Abstract

Strengthening deficient steel structures using prestressed Carbon Fibre Reinforced Polymer (CFRP) would be a promising technology. Fatigue loading and hygrothermal exposure can weaken the adhesive bonding, thereby affecting the durability behaviour of the strengthened structures. In this paper, the prestress loss and flexural performance of strengthened steel beams subjected to fatigue damage (FD) and wetting/drying cycles (WDCs) were experimentally investigated. The prestress loss after WDCs exposure is less than 60.8 mu epsilon, indicating the effectiveness of the end anchorage system. The FD, WDCs, and the combined effects have a slight influence on the stiffness and load capacity of the strengthened steel beams. However, the debonding initiation is greatly affected by FD and WDCs for strengthened steel beams, and further degradation can be found for strengthened steel beam subjected to the combined effects. Moreover, the ultimate CFRP utilization ratio remains above 90% for prestressed beams even subjected to the combined effects.