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.
Highlights
Structural strengthening and rehabilitation have grown in popularity over the last decade because of their obvious benefits and applications
(i) Load carrying capacity of the single layer of fully wrapped and strip-wrapped beams is improved by 23% and 10%, respectively, in comparison with the control beams. e jute fibre-reinforced polymer (JFRP) bonded to the beam, which inhibited the development of cracks and delayed their formation
When the JFRP was used in the flexure deficient beams, initial cracks formed at higher loads than their respective control beams
Summary
Structural strengthening and rehabilitation have grown in popularity over the last decade because of their obvious benefits and applications. Sen and Reddy [17] compared the natural to artificial fibre-reinforced polymer composite-retrofitted RC beams for their flexure strength, strengthening significantly improved ductility, flexural strength, and load-deflection behaviour. A review of the literature revealed the behaviour and effect of fibre-reinforced polymer composites (both artificial and natural) strengthening on RC beams under flexural loading systems. In this research study, the purpose is to determine the influence of natural JFRP on the posttensioned concrete beams, structurally retrofitted, and to improve the flexural behaviour of the concrete beams. E following issues are intended to be addressed in the current research investigation: (a) the first step is to investigate the feasibility/applicability of using a natural fibre system to strengthen beams and improve their performance and (b) the second objective is to comprehend the flexural capacity of the posttensioned beams wrapped with jute fibre-reinforced polymer (JFRP) composites. Research Significance. e following issues are intended to be addressed in the current research investigation: (a) the first step is to investigate the feasibility/applicability of using a natural fibre system to strengthen beams and improve their performance and (b) the second objective is to comprehend the flexural capacity of the posttensioned beams wrapped with jute fibre-reinforced polymer (JFRP) composites. e authors investigated JFRP composites for their mechanical properties to confirm their suitability [25]
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