International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023
p-ISSN: 2395-0072
www.irjet.net
Flexural Analysis of RC Beam Strengthened with Side Near Surface Mounted-CFRP Techniques Mohd. Faisal Ameen Mohd. Ejaz1, Prof. P.S. Lande 2 1PG Student Department of Applied Mechanics, Government College of Engineering, Amravati, Maharashtra, India 2 Associate Professor, Department of Applied Mechanics, Government College of Engineering, Amravati,
Maharashtra, India ---------------------------------------------------------------------***---------------------------------------------------------------------
Abstract - In this paper an analytical and numerical study
mounted (NSM) fiber-reinforced polymer (FRP) reinforcement technique has gained significant attention in both research and practical applications in recent years. Side near surface mounted fiber reinforced polymer technique is one of the several methods which are employed to improve reinforced concrete elements. The side near surface mounted (SNSM) technique has been proposed for strengthening RC beams. In SNSM method the CFRP rods were placed laterally, adjacent to the longitudinal steel bars inside precut grooves. CFRP; also called Carbon fiberreinforced polymer, is a composite material made of a polymer matrix reinforced with fibres have been used. It is not prone to corrosion in hostile environment. The FRP bars are protected from detrimental mechanical impact due to their embedding within the concrete and the use of a binder agent. After the strengthening process is completed, the structural appearance of the elements is typically almost unchanged. With the development of fiber-reinforced polymer (FRP) composites, FRP reinforcement emerged as an innovative alternative to traditional steel reinforcement. FRP composites, embedded in a polymer matrix, possess high strength, low weight, and corrosion resistance. Research studies started to emerge, focusing on the application of these materials for the strengthening of concrete elements and structures. Due to high tensile strength FRP bars can resist larger loads. When it comes to designing strengthened elements, there may not be a specific code dedicated solely to this method. However, various models and guidelines have been developed by researchers and organizations to estimate the ultimate capacity and predict the failure behavior of strengthened elements. Some of the key data that should be collected during the inspection of deteriorated beams include:
was conducted on RC beam strengthened with the side near surface mounted technique. Finite element-based software ANSYS was used to model the geometry of the beam. Thus, the result generated by the software is compared with manual hand calculations using mathematical and theoretical concepts given by Indian Standard and American standard codes. The results are validated by comparing analytical and experimental setups conducted by previous researchers. The result obtained shows a good agreement between the analytical and numerical results. This higher accuracy in the result is achieved by using Finite Element based software ANSYS. The result shows a significant reduction in the deflection of the RC beam strengthened with side near surface mounted CFRP rebar and strip. The comparative result of the SNSM and NSM methods is obtained and the flexural response of the beam is studied. Flexural strength, maximum shear, Strain energy, maximum stress, and strain are the parameters carried out in this study. Key Words: Flexural strength, FRP, CFRP, SNSM, NSM, Stress, Strain energy, Shear.
1.INTRODUCTION Several factors might decrease the ultimate load-carrying capacity of concrete structures such as steel corrosion in an aggressive environment, design calculation errors, and poor mix design. Demolition and reconstructing deteriorated structures are uneconomical. Therefore, it is considered important to strengthen and improve the strength of deteriorated structures. Structural strengthening involves upgrading existing structures to enhance the strength of structural members, enabling them to carry additional loads or improving their performance under existing loads. There are various factors that can necessitate structural strengthening, including construction errors, changes in building codes, deterioration over time, modifications in building usage, or deficiencies in the original design. The near-surface mounted (NSM) fiber-reinforced polymer (FRP) technique is one of the methods used to strengthen reinforced concrete elements. The NSM technique involves bonding fiber-reinforced polymer materials, such as carbon or glass fibers, to the surface of existing concrete elements in order to enhance their structural capacity. The near-surface
© 2023, IRJET
|
Impact Factor value: 8.226
• The main reinforcement ratio which plays a significant role in the effectiveness of strengthening measures, especially in reinforced concrete beams. If the existing element is already over-reinforced, the effectiveness of strengthening may be limited, as the failure mode may shift to compression failure rather than tension failure. According to the ACI (American Concrete Institute) Code, excessive reinforcement can lead to brittle failure modes and is generally not desirable. • Determining the concrete cover thickness is essential to assess the feasibility of using the near-surface
|
ISO 9001:2008 Certified Journal
|
Page 336