OPTIMUM DESIGN OF THE THICKNESS OF CARBON FIBRE REINFORCED POLYMER MATERIAL (CFRP) REQUIRED FOR STRENGTHENING OF DEFICIENT REINFORCED CONCRETE BEAM
OPTIMUM DESIGN OF THE THICKNESS OF CARBON FIBRE REINFORCED POLYMER MATERIAL (CFRP) REQUIRED FOR STRENGTHENING OF DEFICIENT REINFORCED CONCRETE BEAM
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Date
2019-12
Authors
MUHAMMAD, Nuruddeen
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Abstract
A Carbon fiber-reinforced polymer (CFRP) has emerged as promising material for rehabilitation
of existing reinforced concrete structures. However, one of the major concerns of using this
material is its high cost. In this research, a classical optimization technique was employed to
optimize the thickness of Carbon Fibre Reinforced Polymer material used in strengthening of
shear and flexuralydeficient reinforced concrete beam. A simply supported reinforced concrete
beam was designed in accordance with Eurocode 2 design criteria;the beam was subjected to
shear deficiency and subsequently flexural deficiency at 25% capacity reduction level.
Strengthening of the beam was achieved using externally bonded system with CFRP material of
1.2mm design thickness and in accordance with Intelligent sensing for imaging
structures(ISIS2004) strengthening guidelines. Results indicate that the application of CFRP
material increased the overall shear and flexural resistance of the beam by 95% and 79%
respectively.Generalised Reduced Gradient (GRG) method was employed for the optimization.
An optimum CFRP thickness of 0.06mm and 0.41mm was obtained from the result of the GRG
program implemented for shear and flexural strengthening of the deficient Reinforced
Concretebeam. Sensitivity analysis was carried out to determine the influence of parameters such
as load ratio, steel reinforcement ratio and different CFRP elastic modulus on the optimum
thickness of the material at 10, 20, 30, 40, 50 60, 70, 80, and 90% capacity levels. CFRP
modulus of 25GPa, 50GPa, 75GPa 100GPa125GPa and 150GPawas considered in the analysis.
The results indicate that the optimum thickness of the FRP material depends largely on the
magnitude of load ratio, the elastic modulus of the CFRP material and the steel reinforcement
ratio.
Description
A DISSERTATION SUBMITTED TO THE SCHOOL OF POSTGRADUATE STUDIES,
AHMADU BELLO UNIVERSITY, ZARIA
IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE AWARD
OF MASTER DEGREE IN CIVIL ENGINEERING
DEPARTMENT OF CIVIL ENGINEERING,
FACULTY OF ENGINEERING,
AHMADU BELLO UNIVERSITY,
ZARIA, NIGERIA
Keywords
OPTIMUM DESIGN,, THICKNESS,, CARBON FIBRE REINFORCED POLYMER MATERIAL,, REQUIRED FOR STRENGTHENING,, DEFICIENT REINFORCED CONCRETE BEAM