Natural Jute Fibre-Reinforced Polymer Composite System for Posttensioned Beam Strengthening in Flexure

Abstract

Existing structures require repair and strengthening owing to degradation caused by incorrect design and construction, environmental impacts, or structural upgradation to meet new seismic design standards or to correct execution problems that occurred during construction. These strengthening requirements can be satisfied by a variety of strengthening techniques. The creation of a fibre-reinforced polymer (FRP) composite system offers a new design method for the strengthening of existing structures. In this study, posttensioned beams are strengthened by using sustainable materials such as natural jute fibre-reinforced polymer (FRP) composites. The performance of these composite systems in the flexural strengthening of posttensioned beams was used to assess their effectiveness. Consequential result for longitudinal reinforcement throughout the length of the beam for flexural strengthening was evaluated. Flexural performance, crack width, ductility, and load-deflection relationship study of control beams (Scheme A) and retrofitted beams (Schemes B and C) under different wrappings were considered in the investigation. An experimental study depicts that using the full wrapping (FW) technique increases the flexural strength of PSC beams wrapped in JFRP by 23% and, by using the strip wrapping (SW) technique, the flexural strength is increased by 10%. The JFRP composite system of strengthening has shown the highest deformability index and showed that the JFRP material has enormous potential as a structural strengthening material.

Mechanical Characterization of Biocomposites Reinforced with Untreated and 4% NaOH-Treated Sisal and Jute Fibres

“…(e work highlights the processing methods and characterization of natural FRP composites. Archana et al [30] have studied the properties of biodegradable composites to suit the strengthening of the existing structure. (ey noticed that heat-treated fibre-reinforced composites have resulted in better properties than the untreated fibre composites.…”

“…Based on their performance under tests, they were concluded that natural fibre-reinforced polymer composites can be used as a substitute for artificial fibre-reinforced polymer composites. Archana et al [31] showed experimentally that jute NFRC system can be used for posttensioned beam strengthening in the civil application, and it can be a better choice for replacing artificial fibre composites. Sen et al [32] studied the efficacy of jute FRP composite for retrofitting of existing beams, and they have compared it with the artificial fibre systems such as carbon and glass FRP.…”

Natural fibres and biopolymers in FRP composites for strengthening concrete structures: A mixed review

“…Bio-based FRPs have been used to strengthen RC beams in various conditions including regular rectangular beams, pre-damaged beams [65], beams with corroded reinforcement [66,67], beams with insufficient reinforcement [67][68][69][70], beams with openings [71], deep beams [65,72,73] and post-tensioned beams [74,75].…”

“…Researchers have predicted the behaviour of bio-based FRP systems in various ways. Some authors predicted the behaviour of RC strengthened beam numerical modelling with software like ABACUS [3,86], ANSYS [6,76] and ATENA [70,91], while some have used artificial neural network modelling [74,95]. Some authors have also adopted analytical methods.…”

Use of Natural and Synthetic Fiber-Reinforced Composites for Punching Shear of Flat Slabs: A Comparative Study

“…De Azevedo et al [29] suggested that natural fibers exhibited promising potential in augmenting the flexural strength of geopolymer matrices. Several researchers [30][31][32][33][34][35][36] highlighted the ability of natural fibers in improving the structural behavior of RC beams. Others [37,38] used natural fibers in the renovation of RC columns.…”