Introduction strength, flexibility, stiffness and resistance to chemical harm.

Introduction

 

 

Glass fibers Reinforced polymer bars have been prepared by
various manufacturing technology and are widely used for various applications.
Nowadays, it has been used in construction, electronics, aviation, and
automobile application etc. glass fibers are having excellent properties like
high strength, flexibility, stiffness and resistance to chemical harm. They are
in the form of roving’s, chopped strand, yarns, fabrics and mats. Each of those
have unique properties and are used for various applications.

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In that case, Using Glass fiber reinforced polymer bars, an
alternative to steel as internal reinforcement for new concrete structures has
become a topic of interest due to the material’s high tensile strength, light
weight, and inability to corrode. Even the experimental testing is essential to
observe the actual behavior and failure mode of structures, this will be very
expensive, time consuming, and not possible for existing structures. Thus, the
development and utilization of advanced analytical methods such as finite
element analysis (FEA) is being encouraged to study the behavior of structures.

This research investigates the suitability of Glass fiber
Reinforced Polymer in Curved structures and its flexural behavior through a series
of numerical models.

 

Problem Statement

 

 

Fibers Reinforced polymer (FRP) materials were originally
developed for the use in the aerospace and automotive industries due to their
high strength and light weight. But later, because of some considerable
shortcomings, it has been introduced in Civil engineering applications too. Steel
reinforced concrete structures are susceptible to corrosion of the
reinforcement in Alkaline medium and this induces tensile stresses within the
concrete which leads to deterioration of Concrete. So FRP reinforcing bars can
be proposed which does not corrode electrochemically and making this technology
is an attractive solution for structures in corrosive environments.

Further, when it comes to curved structures steel
reinforcements cannot be used at all situations because of its high Elastic of
modulus. Thus, GFRP can be preferred for such situations which can show more
effective performance in flexure.

 

Significance of the research

 

 

Because of the shortcomings of the steel reinforcement, GFRP
can be used in various Civil engineering applications especially in curved
structures. When a new material such as GFRP is introduced experimental testing
is essential where the material is being utilized. As some results cannot be
visualized experimentally, preparing a numerical model will make more sense
because it saves the time and cost.

Due to the lower modulus of elasticity compared to the steel,
larger deflections and crack widths can be expected. So a complete study on its
flexural behavior on curved structure should be carried out. This research to
be done to predict the curvature effects on flexural performance since it has
not been researched widely.

 

Scope of the study

 

 

This research is mainly focusing on the curvature effects of
GFRP concrete beams and their flexural performance.  All the predictions from this finite element
model will allow for an effective design of future experimental tests and
accurate prediction of beam specimen.

                                                                                                                                                           

Aims and objectives of the research

 

 

·      
Identify the appropriate material properties of GFRP using
experimental study data

·      
Simulate a numerical model to analyze the flexural
performance of straight Glass fiber reinforced polymer bars used concrete
beams.

·      
Perform a numerical analysis of Curvature effects on flexural
performance of Glass fiber reinforced concrete beams.

 

 

 

 

Proposed Methodology

 

 

After reviewing all existing research papers on the relevant
research area thoroughly, current problems and other developed approaches can
be clearly identified. Hence, the appropriate modelling technique will be
defined.

Then the material properties of concrete such as compressive
strength, tensile strength, modulus of elasticity, poison’s ratio will be obtained.
Properties of GFRP should be also obtained from experimental studies. Numerical
model of Straight GFRP Concrete beams should be simulated using ABAQUS. For
this, Beam parts and sections should be assigned, Concrete element should be
selected and Beam boundary conditions should be assigned.

While
modelling, discrete one dimensional truss sections and Smeared reinforced
membrane sections both methods should be studied. Later, the model should be
developed to analyze the curvature effects on flexural performance of it.  Finally the results obtained from experimental
study and numerical model should be compared and concluded.