Strengthening of high performance concrete beam column joints using fibre reinforced polymer

Abstract

In the current study, the beam column joint core is constructed using HPC. Several FRP designs are used to strengthen these joints, and the efficiency of the systems is assessed. The HPC mix of M70 grade was used to cast the control specimens of beam column joints, which underwent failure testing after casting. HPC was only used to cover the joint area up to 20% of each joint sideand#39;s length and remaining beam column joint cast using M20 concrete. By filling in the fractures, voids and preparing the surface for the later application of a FRP strengthening system, all of the tested control specimens that had been damaged in the early phase had been repaired. The beam-column joints have been classified into four groups: A, B, C, and D. Glass fibre reinforced polymer (GFRP) fabric, SikaWrap-430G, Carbon fibre reinforced polymer (CFRP) fabric, SikaWrap -230C, and Carbon fibre reinforced polymer (CFRP)fabric, SikaWrap-450C were the three main types of FRP fabric wrap materials and Sika Corbodur S514 Carbon Fibre Reinforced Polymer (CFRP) Laminate Plates were used. The jointsand#39; first crack load, maximum load, load deformation behaviour, characteristics of failure, and ductility-related metrics were examined. Double layer all-around wrapping has been found to significantly increase load carrying capacity compared to single layer all-around wrapping. The effectiveness of CFRP2 over GFRP and CFRP1 can also be inferred. The specimens with Single Layer Front, Back, and Side (SFBS) strengthening pattern showed superior performance. Flexural toughness, tensile strength and ductility-related metrics are significantly improved by the use of FRP. When HPC beam-column joints have failure in the form of cracking and spalling, FRP can be used to successfully strengthen them. This method will be superior to conventional ones because FRP has better strength and stiffness to weight ratios, excellent fatigue behaviour, and corrosion resistance, as well as quick applications and relatively short construction times. newline