International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 08 | Aug 2023
p-ISSN: 2395-0072
www.irjet.net
PARAMETRIC STUDY OF GLASS FIBRE REINFORCED POLYMER (GFRP) STRENGTHENED CONCRETE COLUMN UNDER ECCENTRIC COMPRESSION LOAD Ajay Kumar, Deepak Tarachandani Applied Mechanics Department L. D. College of Engineering Ahmedabad ------------------------------------------------------------------------***------------------------------------------------------------------------properties, resulting in reduced load-carrying capacity ABSTRACT: The study investigated the performance of and serviceability. To prevent corrosion and degradation, protective measures are necessary, but they can come with a significant upfront cost.
reinforced concrete columns that were strengthened using GFRP materials when subjected to eccentric loading. Eccentric loading refers to the application of a load that is not centrally located, causing an off-centre force on the column. This type of loading is known to introduce additional challenges and stress concentrations in the column.
Glass fiber reinforced polymer (GFRP) bars are considered the optimal alternative to steel bars due to their high tensile strength, lightweight nature, low density, and excellent electromagnetic resistance. Most importantly, they possess superior corrosion resistance.
The objective of the research was to evaluate the effectiveness of GFRP strengthening in improving the performance of reinforced concrete columns under eccentric loading. The researchers conducted FEA analysis on a series of reinforced concrete columns, with various parameters such as length, cross section, eccentricity, end condition and varied spacing of stirrups to compare their ultimate load carrying capacity and displacement.
Fiber Reinforced Polymers (FRP) were originally created for the aerospace industry and later adopted by the automotive industry. However, their superior characteristics in comparison to other materials made them a preferred choice for civil engineering applications over time. When it comes to research on FRP-confined concrete columns, the focus is typically on studying the stressstrain relationship of these columns, observing how they behave under eccentric load, and evaluating their seismic performance.
Finite Element Analysis (FEA) is employed to simulate the behaviour of GFRP-strengthened concrete columns. The numerical models are validated against experimental results obtained from laboratory tests conducted on prototype specimens. The study investigates the influence of each parameter on the ultimate load carrying
Since most columns in structures are subjected to eccentric loads, the study of the behaviour of FRPconfined reinforced concrete columns under such loads holds greater significance.
capacity and displacement of the columns, aiming to identify the optimal configuration for GFRP strengthening.
2. FINITE ELEMENT MODELLING: Numerical simulations of GFRP reinforced concrete columns were done by using software ABAQUS. During the modelling of specimens, the concrete material models, boundary conditions, and different geometric and material parameters. The concrete material was modelled as a homogeneous 3D solid section. Diameter of main reinforcement is 25 mm and diameter of stirrups is 8 mm.
Overall, the research demonstrated the potential of GFRP strengthening in enhancing the behaviour and performance of reinforced concrete columns subjected to eccentric loading. These findings can contribute to the development of improved design guidelines and strategies for strengthening existing structures or designing new ones with increased resistance to eccentric loading effect.
In total 48 number of models were prepared and the variable in models are length, end condition, cross sectional dimension, eccentricity and varied stirrup spacing.
Key words: GFRP, Eccentric loading, Strengthening. 1.
INTRODUCTION: When exposed to a humid environment, the steel bars in reinforced concrete (RC) structures experience a decline in their mechanical © 2023, IRJET
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