A FEM-based model to study the behaviour of corroded RC beams shear-repaired by NSM CFRP rods technique

Abstract

This paper presents the main features of finite element FE numerical model developed using the computer code FEMIX to predict the near-surface mounted NSM carbon-fiber-reinforced polymer CFRP rods shear repair contribution to corroded reinforced concrete RC beams. In the RC beams shear repaired with NSM technique, the Carbon Fibre Reinforced Polymer (CFRP) rods are placed inside pre-cut grooves onto the concrete cover of the RC beam's lateral faces and are bonded to the concrete with high epoxy adhesive. Experimental and 3D numerical modelling results are presented in this paper in terms of load-deflection curves, and failure modes for 4 short corroded beams: two corroded beams (A1CL3-B and A1CL3-SB) and two control beams (A1T-B and A1T-SB), the beams noted with B were let repaired in bending only with NSM CFRP rods while the ones noted with SB were repaired in both bending and shear with NSM technique. The corrosion of the tensile steel bars and its effect on the shear capacity of the RC beams was discussed. Results showed that the FE model was able to capture the main aspects of the experimental load-deflection curves of the RC beams, moreover it has presented the experimental failure modes and FE numerical modelling crack patterns and both gave similar results for non-shear repaired beams which failed in diagonal tension mode of failure and for shear-repaired beams which failed due to large flexural crack at the middle of the beams along with the concrete crushing, three dimensional crack patterns were produced for shear-repaired beams in order to investigate the splitting cracks occurred at the middle of the beams and near the support.

Shear strengthening of RC beams with NSM FRP. I: Review of strength models

“…Hawileh 2012; Ke et al, 2022; Omran and El-Hacha 2012; Sakar et al, 2014; Zhang and Teng 2014; Yao and Wu 2016; Zhang and Yu 2016; Zhang and Teng 2013) and shear (e.g. Abdel-Jaber et al, 2021; Almassri et al, 2015; Barros et al, 2013; Haddad and Obaidat 2018; Jawdhari and Adheem 2018; Mostofinejad et al, 2019) to simulate the behaviours of strengthened beams in debonding failure modes. Relevant strength models for NSM FRP flexurally (e.g.…”

Reduce of bearing strength of the bent reinforce-concrete elements on a sloping section with the corrosive damage of transversal armature

“…In foreign literature it is possible to distinguish some works [11,12] which give the results of researches of durability and character of destructions of the reinforce-concrete beams on a sloping section, exposed to influence of aggressive environment.…”