Experimental and numerical analyses of flexurally-strengthened concrete T-beams with stainless steel. (1st October 2018)

• Record Type: Journal Article
• Authors: Franco, Noel; Biscaia, Hugo; Chastre, Carlos
• Is Part Of: Engineering structures. Volume 172(2018)
• Page Start: 981
• Page End: 996
• Publication Date: 2018-10-01
• Subjects: Concrete beams -- Flexural strengthening -- Stainless steel -- Externally Bonded Reinforcement -- Near Surface Mounted -- Numerical simulation; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2018.06.077
• Languages: English
• ISSNs: 0141-0296

Abstract

Graphical abstract: Highlights: The stainless-steel to concrete bond-slip relationships are obtained through bonding tests. Post-installed stainless steel bars and rods are used to flexural strengthening RC T-beams. The EBR, NSM and MF-EBR techniques are used to strengthening the RC T-Beams. The flexural behaviour and the rupture modes of the RC T-beams are discussed. The numerical simulations of the RC T-beams are presented and compared with the experiments. Abstract: This work presents the results and the main conclusions of a series of experimental tests carried out to evaluate the efficiency of post-installed stainless steel reinforcement on the flexural strengthening of Reinforced Concrete (RC) T-beams when the bonding techniques EBR (Externally Bonded Reinforcement), NSM (Near Surface Mounted) and MA-EBR (EBR with Mechanical Anchors) are used. The RC T-beams were also modelled using a commercial Finite Element (FE) software in order to predict their behaviour until the rupture. For this purpose, a set of single-lap shear tests were also carried out to evaluate the local bond-slip relationships developed within the Stainless Steel (SS)-to-concrete interface. Due to the experimental bond-slip relationships, the numerical simulations were able to predict, with good accuracy, the different behaviours of the RC T-beams until their rupture. Moreover, the different rupture modes observed on all the RC T-beams herein tested were very well estimated by the numerical analyses. The tests of the RC T-beams showed that all the strengthening techniques allowed their flexural stiffness to be increased. Nevertheless, the RC T–beams strengthened with the EBR and NSM techniques had premature ruptures, i.e. the rupture in the RC T-beams occurred even before the yielding of their steel reinforcements. The RC T-beam strengthened with the MA-EBR technique showed good ductility and the highest load bearing capacity, which means that the MA-EBR technique is the best bonding technique herein used.