Numerical simulation of performance of near-surface mounted FRP-upgraded beam–column sub-assemblages under cyclic loading

Abstract

This study deals with the performance of the upgrading schemes for the existing gravity load designed (GLD) reinforced concrete (RC) beam -column sub-assemblages using near-surface mounted (NSM) fibre-reinforced polymer (FRP) bars. In this study, exterior beam -column sub-assemblage of a general RC-framed structure has been considered. Numerical investigations of the sub-assemblages have been carried out under cyclic loading using nonlinear finite element analysis. Experimentally validated numerical models have been used for evaluating the performance of various upgrading schemes using NSM bars. Cyclic behaviour of reinforcement, concrete modelling based on fracture energy, bond-slip relations between concrete and steel reinforcement have been incorporated. The study also includes numerical investigation of crack and failure patterns, ultimate load-carrying capacity, strain comparisons and formation of plastic hinges, load-displacement hysteresis, energy dissipation and ductility. Seismic performance in terms of energy dissipation and development of strain in beam bar shows that some of the upgraded schemes are found to be comparable to the seismically designed ductile specimens. The findings of this study would be helpful to the practising and design engineers for developing detailing criteria for newly designed -or strengthening of deficient -reinforced concrete structure.

An experimental and analytical investigation of reinforced concrete beam-column joints strengthened with a range of CFRP schemes applied only to the beam

“…Thus, a large number of tests have been carried out to investigate the behaviour of RC beam-column joints under monotonic or cyclic loading; generally, these tests involved the concentric loading of the beams and columns (i.e. Davood and Alireza, 2017; Hamil, 2000; Mostofinejad and Hajrasouliha, 2019; Mostofinejad et al, 2018; Parker, 1997; Sarsam and Phipps, 1985; Sasmal, 2009; Triantafillou and Antonopoulos, 2003). However, in practice, structural members undergo a combination of both concentric and eccentric (torsion) loads during the construction stages and their working life.…”

Performance evaluation of intermittently CFRP wrapped square and circularised square reinforced concrete columns under different loading conditions

“…The use of fibre reinforced polymer (FRP) in strengthening existing deficient RC structures has been gaining increasing popularly in the construction industry (Durucan and Anıl, 2017;Oller, Cobo, & Marí, 2011;Shannag, Al-Akhras, & Mahdawi, 2014). The popularity of FRP is due to its advantageous characteristics such as high tensile strength, lightweight, resistance to corrosion and ease of construction (La Malfa Ribolla et al, 2018;Sasmal, Khatri, & Karusala, 2015;Shannag, et al, 2014). The FRP has been successfully applied for strengthening RC columns (Z.…”

A review of FRP strengthened concrete structures under extreme loading

“…A large number of studies have been carried out to investigate the seismic performance of beam-column joints strengthened using FRP systems. The FRP strengthening for exterior or interior beamcolumn joints can be usually classified in six schemes: (a) L-shape overlay on the beam-column joint ( Li and Chua 2009, Attari et al 2010, Li and Kai 2011, Fakharifar et al 2014, (b) column wrapping (Pantelides et al 2008, Li and Kai 2011, Fakharifar et al 2014, Realfonzo et al 2014, (c) column and beam wrapping (Li and Chua 2009, Sasmal et al 2011, Akguzel and Pampanin 2012, Agarwal, et al 2014, Hadi and Tran, 2015, (d) column warping in addition to U-shape external bonding under beam (Al-Salloum and Almusallam, 2007, Li and Chua 2009, Alsayed et al 2010, Alhaddad et al 2012, Fakharifar et al 2014, (e) web-bonded FRP (Pantelides et al 2008, Li and Kai 2011, Fakharifar et al 2014, Realfonzo et al 2014, (f) near surface mounted FRP on beam and/or column (Sasmal et al 2014). These schemes may be jointly applied in order to dramatically improve the seismic performance of the joints (Li and Kai 2011).…”