Studies on stress-strain behaviour of concrete mixes confined with BFRP rebars

K Ajay Kumar,V Srinivasa Reddy,S Shrihari,A Venkat Sai Krishna

doi:10.1051/e3sconf/202130901049

Abstract

In the present study, the stress-stain behaviour of confined concrete made with basalt fibre reinforced polymer bars (BFRP) were taken up. The stress-strain behaviour was studied for the concrete mixes confined with steel rebars and BFRP rebars. The confinement was given in the form of steel hoops in the cylinders, 3 hoops (0.8%), 4 hoops (1.1%), 5 hoops (1.3%) and 6 hoops (1.6%). The addition of basalt fibres along with confinement of concrete with steel and BFRP hoops enhanced the compressive strength, indicating further confinement effect in the concrete. It is observed that the addition of fibres is helpful in lower confinements only. Beyond 1.1% confinement, the addition of any type of basalt fibres doesn’t show any effect on compressive strengths. From the stress-strain behaviour of all types of concrete mixes, it is concluded that the ultimate load-carrying capacity and strains at peak stresses are more in concrete with BFRP hoops for mixes up to 1.1% confinement. The addition of basalt fibres to concrete has increased the ductility in both confined and unconfined states

Highlights

The Studies on Stress-Strain behaviour of concrete are essential in determining the parameters like energy absorption, toughness, plasticity index and they are very useful in design of structures using such concretes
The stress-stain behaviour of confined concrete made with basalt fibre reinforced polymer bars (BFRP) were done. In this phase of investigations, the stress-stain behaviour of concrete confined by steel and BFRP rebars were taken up
From the stress-strain behaviour of all types of FRSCC, it is concluded that the ultimate load-carrying capacity and strains at peak stresses are more in SFRSCC and HFRSCC for mixes up to 1.1% confinement

Summary

Introduction

The Studies on Stress-Strain behaviour of concrete are essential in determining the parameters like energy absorption, toughness, plasticity index and they are very useful in design of structures using such concretes. Further modelling the stress-strain behaviour helps in predicating their behaviour. The stress-stain behaviour of confined concrete made with basalt fibre reinforced polymer bars (BFRP) were done

Methodology

Findings

Conclusions