Shear Behaviour of RC Beams Strengthened by Various Ultrahigh Performance Fibre‐Reinforced Concrete Systems

Abstract

This study presents a numerical investigation on the shear behaviour of shear-strengthened reinforced concrete (RC) beams by using various ultrahigh performance fibre-reinforced concrete (UHPFRC) systems. The proposed 3D finite element model (FEM) was verified by comparing its results with those of experimental studies in the literature. The validated numerical model is used to analyse the crucial parameters, which are mainly related to the design of RC beams and shear-strengthened UHPFRC layers, such as the effect of shear span-to-depth ratio on the shear behaviour of the strengthened or nonstrengthened RC beams and the effect of geometry and length of UHPFRC layers. Moreover, the effect of the UHPFRC layers’ reinforcement ratio and strengthening of one longitudinal vertical face on the mechanical performance of RC beams strengthened in shear with UHPFRC layers is investigated. Results of the analysed beams show that the shear span-to-depth ratio significantly affects the shear behaviour of not only the normal-strength RC beams but also the RC beams strengthened with UHPFRC layers. However, the effect of shear span-to-depth ratio has not been considered in existing design code equations. Consequently, this study suggests two formulas to estimate the shear strength of normal-strength RC beams and UHPFRC-strengthened RC beams considering the effect of the shear span-to-depth ratio.

Ultra-High-Performance Fiber-Reinforced Concrete: Applications

“…ˑBoth ˑthe ˑbusiness ˑand ˑpublic ˑsectors ˑare ˑincreasingly ˑpaying ˑcloser ˑattention ˑto ˑand ˑpushing ˑfor ˑgreater ˑefforts ˑto ˑmake ˑuse ˑof ˑthis ˑnovel ˑand ˑpromising ˑmaterial [23][24][25][26][27][28]. Several varieties of "UHPC ˑhave ˑbeen ˑdeveloped ˑto ˑdate ˑin ˑvarious ˑcountries and by various manufacturers, ˑincluding ˑCeracem+, ˑBSI+, ˑcompact ˑreinforced ˑcomposites ˑ(CRC), ˑmultiscale ˑcement ˑcomposite ˑ(MSCC), ˑand ˑreactive ˑpowder ˑconcrete ˑ(RPC) ˑ [29][30][31][32][33][34]. ˑIn ˑMalaysia, ˑUHPC ˑbegan ˑits ˑindustrial-commercial ˑpenetration as a sustainable construction material under the brand name Dura+ in late" 2010 [31,[35][36][37][38].…”

Ultra-High-Performance Fiber-Reinforced Concrete: Fresh Properties

“…ˑFurthermore, ˑFerrara, et al [56] ˑdiscovered ˑthat ˑthe ˑtype ˑof ˑplacing ˑof ˑfresh ˑUHPC ˑin the mold, rather than the casting technique utilized, has a substantial impact ˑon ˑuniform ˑfiber ˑdistribution [57][58][59][60][61]. ˑFresh ˑUHPC ˑis ˑplaced ˑfrom ˑone ˑedge ˑof ˑthe ˑmold, ˑletting ˑit ˑto ˑflow ˑto ˑthe ˑother ˑend ˑin ˑthe ˑlongitudinal ˑdirection, ˑdemonstrating ˑa ˑmore ˑsuitable ˑfiber" ˑorientation ˑfor ˑachieving ˑthe ˑgreater ˑflexural strength [62][63][64][65][66][67][68][69][70].…”

Shear-flexural cracking strength of RC beams with external vertical prestressing rebars: Theoretical investigation and numerical simulation

“…Numerical simulation proved to be effective in studying the shear behavior of RC structures (Mansour et al, 2021; Mansour and Tayeh, 2020; Sakr et al, 2019). The analysis method in this part is that, first, the FE models were created for the eight test specimens given by Altin et al (2003), and the numerical simulation results were compared with the theoretical value and experimental data to validate the FE models.…”