International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 11 Issue: 07 | July 2024
p-ISSN: 2395-0072
www.irjet.net
Enhancing the Strength of Reinforced Concrete Beams With Glass Fiber Reinforced Polymer Composite Strengthening Akash Dewangan1, Dr. R.R.L.Birali2, Mr.Akhand Pratap Singh3 M.Tech Scholar1, Assistant Professor2, Assistant Professor3 Department of Civil Engineering Shri Rawatpura Sarkar University Raipur Chhattisgarh -----------------------------------------------------------------------------***------------------------------------------------------------------------Abstract Extensive research is underway globally on the application of fiber-reinforced polymer (FRP) wraps, laminates, and sheets for the repair and strengthening of reinforced concrete structures. Fiber-reinforced polymer (FRP) systems offer a highly effective and economically viable alternative to traditional repair methods for enhancing the structural performance of weakened concrete members. This study focuses on the experimental investigation of the flexural and shear behavior of reinforced concrete (RC) beams strengthened with continuous glass fiber reinforced polymer (GFRP) sheets. Concrete beams externally reinforced with epoxybonded GFRP sheets were tested to failure under a symmetrical two-point concentrated static loading system. Two experimental sets were utilized: SET I involved three beams deficient in flexure, including one control beam and two beams strengthened with GFRP sheets in flexure; SET II involved three beams deficient in shear, including one control beam and two beams strengthened with GFRP sheets in shear. The strengthening was performed with varying amounts and configurations of GFRP sheets. Key experimental data, including load, deflection, and failure modes, were recorded for each beam. The study details the procedure for applying GFRP sheets and investigates the impact of the number of GFRP layers and their orientation on the ultimate load-carrying capacity and failure modes of the beams. Keywords: Reinforced Concrete Beams, Glass Fiber Reinforced Polymer (GFRP), Flexural Strengthening, Shear Strengthening, Experimental Investigation, Load Carrying Capacity, Failure Modes.
1. Introduction The maintenance, rehabilitation, and upgrading of structural members are critical challenges in civil engineering. Many older structures, built to outdated design codes, are now deemed unsafe according to current standards. Replacing these elements is expensive and time-consuming, making strengthening a preferable method to enhance load-carrying capacity and extend service life. Infrastructure decay, often due to deterioration or damage, has prompted the development of various repair and strengthening techniques. Structural strengthening is needed for:
Increased Load Requirements: Changes in use or additional loads demand enhanced capacity.
Unanticipated Loads: Structures must resist new loads from wind, seismic forces, or blasts.
Deficiencies in Design: Issues like corrosion, damage, or design errors necessitate strengthening.
Each project presents unique challenges, including space, constructability, and budget constraints. Strengthening typically involves addressing flexural, shear, axial, and torsional forces, and can be achieved through techniques such as section enlargement, externally bonded reinforcement, post-tensioning, and supplemental supports.
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