International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 06 | Jun 2023
p-ISSN: 2395-0072
www.irjet.net
STRENGTHENING OF DISTRESSED STRUCTURAL ELEMENT BY USE OF GLASS FIBRE REINFORCED POLYMER Shivani Singh, Swati Chaudhary --------------------------------------------------------------------------***----------------------------------------------------------------------ABSTRACT In modern concrete technology, Fibre Reinforced Polymer (FRP) is widely utilized because of its excellent mechanical properties, such as non-conducting, good tensile strength, anti-corrosive , high stiffness etc.,. Reinforced concrete (RC) structural members will gradually lose durability without proper servicing, so these damaged RC structural members need to be repaired and maintained properly, or strengthened. Both the Externally Bonded (EB) and the Near Surface Mounted (NSM) method, both of which use FRP, might be used to reinforce these damaged RC elements. Depending on the FRP used, such as AFRP, CFRP, GFRP, etc., as well as the direction of the FRP, the implementation of FRP to a damaged RC member will result in an increase in strength. The primary objective of this papers is on the application of different FRP types to reinforce distressed RC components by raising their various strength metrics, including axial load carrying capacity, flexural strength, impact load, shear strength, durability and torsional strength. Another major worry in this evaluation is the FRP-enhanced RC member's failure.
1. INTRODUCTION Traditional techniques including external post-tensioning and steel plate connections are frequently employed to reinforce reinforced concrete beams, slabs, and columns. These techniques have intrinsic flaws, such as difficult application and short durability. For reinforced concrete beams and columns, the connection of FRP plates or thin plates has recently gained a lot of popularity. In reality, the Swiss Federal Material Testing and Research Laboratory reinforced RC beams with CFRP plates using FRP for the first time in the middle of the 1980s. This chapter is concerned with studying the behavior and strength of RC elements strengthened FRP plates and sheets. Beams strengthened with FRP suffix plate for flexural strength. RC beams wrapping with ‘D’ and full wrap for shear strength, columns wrap with main fiber horizontal for axial strength and slab wrapped at the soffit for flexural strengthening using FRP wraps. All the discussion are with reference to plain concrete beam and column, which have been the predominant concern of present research.
2. LITERATURE REVIEW CUM. FUNCTIONAL PROPERTIES 2.1. AXIAL LOAD CARRYING CAPACITY OF COMPRESSION MEMBER Although the improvement in strength is greater in the eccentric loaded column than the concentric loaded column, When wrapped in CFRP, the eccentrically laden column had a more noticeable impact. With more CFRP layers, a column's capacity to support weight rises. The CFRP wrapping also increases the column's ductility. According to research by K.P. Jaya et al., the weight carrying capability of a column wrapped in 2, 4, or 6 layers of GFRP increases by 8%, 28%, or 32%, respectively, compared to the specimen that isn't wrapped. When compared to unwrapped columns, columns that have been wrapped with CFRP have an average strength gain of 98.3%. Further comparing the improvement in load capacity wrapped in GFRP and CFRP, According to research by K.P. Jaya et al. (2012), while GFRP gains merely 70% with six layers, CFRP gains 98.3% with a single layer. Rochette et. al. investigation into the compressed rectangular and square column and enclosed with aramid and carbon. The author came to the conclusion that an excessive amount of confinement causes a highly abrupt and devastating event similar to a blast. The confinement effect is inversely correlated with the cross-sectional form for a specific number of wraps. Chaallal et. al. had used CFRP wrap in an exploratory inquiry. The specimen featured cross sections that were square, rectangular, and round. They discovered that the CFRP wrapping boosts compressive strength more for square or rectangular sections than the circular sections. Additionally, they found that the compressive strength significantly rises as
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