Effect of width and layers of GFRP strips on deflection of Reinforced Concret...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Axial Capacity Enhancement of CFRP Confined Columns Made of Steel Fiber Reinf...IOSRJMCE
Results of the experimental study on the axial compressive behavior of steel fiber reinforced concrete (SFRC) wrapped with fiber reinforced polymer (FRP) have been presented in this paper. A total of 18 concrete cylinders were tested under axial compression. The effects of steel fiber parameters were investigated which includes fiber aspect ratio (AR) and fiber volume fraction (VF). The concrete cylinders were divided into groups of confined and unconfined ones. In accordance with previous study, it was found that, FRP confined cylinders showed greater axial stress than that of unconfined specimens. Although the presence of steel fiber increases the peak axial stresses for both confined and unconfined group of specimens, but no significant change of peak axial stress (and peak strain) has been observed in both confined and unconfined group due to increase of fiber volume ratio. But with the increase of fiber aspect ratio, the peak axial stresses of both unconfined and FRPconfined cylinders were found to slightly decrease. It was also observed that, concrete specimens reinforced with internal steel fiber absorbed much higher energy than that of unreinforced ones.
A Study on Effect of Sizes of aggregates on Steel Fiber Reinforced ConcreteIJERD Editor
Plain, unreinforced concrete is a brittle material, with a low tensile strength, limited ductility and
little resistance to cracking. In order to improve the inherent tensile strength of concrete there is a need of
multidirectional and closely spaced reinforcement, which can be provided in the form of randomly distributed
fibers. Steel fiber is one of the most commonly used fibers The present experimental study considers the effect
of aggregate size and steel fibers on the modulus of elasticity of concrete. Crimped steel fibers at volume
fraction of 0%.0.5%, 1.0% and 1.5% were used. Study on effect of volume fraction of fibers and change of
aggregate size on the modulus of elasticity of concrete was also deemed as an important part of present
experimental investigation. This work aims in studying the mechanical behavior of concrete in terms of modulus
of elasticity with the change of aggregate size reinforced with steel fibers of different series for M30 and M50
grade concretes. The results obtained show that the addition of steel fiber improves the modulus of elasticity of
concrete. It was also analyzed that by increasing the fiber volume fraction from 0%, to 1.5% there was a healthy
effect on modulus of elasticity of Steel Fiber Reinforced concrete.
Effect of width and layers of GFRP strips on deflection of Reinforced Concret...inventionjournals
International Journal of Engineering and Science Invention (IJESI) is an international journal intended for professionals and researchers in all fields of computer science and electronics. IJESI publishes research articles and reviews within the whole field Engineering Science and Technology, new teaching methods, assessment, validation and the impact of new technologies and it will continue to provide information on the latest trends and developments in this ever-expanding subject. The publications of papers are selected through double peer reviewed to ensure originality, relevance, and readability. The articles published in our journal can be accessed online.
Axial Capacity Enhancement of CFRP Confined Columns Made of Steel Fiber Reinf...IOSRJMCE
Results of the experimental study on the axial compressive behavior of steel fiber reinforced concrete (SFRC) wrapped with fiber reinforced polymer (FRP) have been presented in this paper. A total of 18 concrete cylinders were tested under axial compression. The effects of steel fiber parameters were investigated which includes fiber aspect ratio (AR) and fiber volume fraction (VF). The concrete cylinders were divided into groups of confined and unconfined ones. In accordance with previous study, it was found that, FRP confined cylinders showed greater axial stress than that of unconfined specimens. Although the presence of steel fiber increases the peak axial stresses for both confined and unconfined group of specimens, but no significant change of peak axial stress (and peak strain) has been observed in both confined and unconfined group due to increase of fiber volume ratio. But with the increase of fiber aspect ratio, the peak axial stresses of both unconfined and FRPconfined cylinders were found to slightly decrease. It was also observed that, concrete specimens reinforced with internal steel fiber absorbed much higher energy than that of unreinforced ones.
A Study on Effect of Sizes of aggregates on Steel Fiber Reinforced ConcreteIJERD Editor
Plain, unreinforced concrete is a brittle material, with a low tensile strength, limited ductility and
little resistance to cracking. In order to improve the inherent tensile strength of concrete there is a need of
multidirectional and closely spaced reinforcement, which can be provided in the form of randomly distributed
fibers. Steel fiber is one of the most commonly used fibers The present experimental study considers the effect
of aggregate size and steel fibers on the modulus of elasticity of concrete. Crimped steel fibers at volume
fraction of 0%.0.5%, 1.0% and 1.5% were used. Study on effect of volume fraction of fibers and change of
aggregate size on the modulus of elasticity of concrete was also deemed as an important part of present
experimental investigation. This work aims in studying the mechanical behavior of concrete in terms of modulus
of elasticity with the change of aggregate size reinforced with steel fibers of different series for M30 and M50
grade concretes. The results obtained show that the addition of steel fiber improves the modulus of elasticity of
concrete. It was also analyzed that by increasing the fiber volume fraction from 0%, to 1.5% there was a healthy
effect on modulus of elasticity of Steel Fiber Reinforced concrete.
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
An experimental investigation was conducted to investigate the behavior of ultra-high strength reactive concrete (RPC) columns before and after strengthening with carbon fiber reinforced polymer (CFRP) sheets jacketing under eccentric axi al load. Twelve columns were tested up to failure, strengthened and retested to examine strengthening efficiency and to evaluate the effects of variation of the concrete type (normal or RPC), presence of steel fibers and main steel reinforcement ratio. Experimental results showed that CFRP jacketing increases the ultimate failure load of strengthened columns up to 185%, highly stiffens them (reduces lateral displacements) and allow more ductile failure than the original columns. Also, inclusion of steel fibers in RPC columns increases failure loads up to 86%, prevents palling of the concrete cover and increase the ductility.
Flexure Behaviour of Ferrocement Strengthened RC beamsIEI GSC
Presentation on Flexure Behaviour of Ferrocement Strengthened RC beams by Akshay Dhariwal & Prof Sunil Raiyani, Institute of Technology, Nirma University, Ahmedabad at #33NCCE 33rd National Convention of Civil Engineers at #IEIGSC
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Flexural behaviour of reinforced cement concrete beam wrapped with gfrp sheeteSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
“Strengthening Of PCC Beams by Using Different Types of Wire Mesh Jacketing”IJMER
This paper presents the effect of the use of different types of wire mesh jacketing to the PCC
beams. The experimental work is mainly concerned with the study of flexural strength of concrete by
different types of wire mesh jacketing. This study brings out the importance of use of strengthening of
existing structure technology by using locally available wire mesh. In this paper, the beams of plain
cement concrete are bonded with locally available wire mesh to strengthen of structural member for
increase its strength. The method mention in this paper is most suited for strengthening and retrofitting
due to their easy availability, economy and their property of being cast to any shape without needing
significant formwork.
Welcome to International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Shear and Flexural Behaviour of R.C.C. Beam With Circular Opening Strengthene...IJERA Editor
This paper explores the behavior of R.C.C. beam with circular opening strengthened by CFRP sheets. In this experimental work five beams were casted, one beam without opening (i.e. solid beam) and one with circular post opening and considered as control beams. The remaining three beams were externally strengthened by Carbon fiber reinforced polymer (CFRP) sheets with different strengthening schemes i.e. around the opening, inside the opening. These beams were simply supported and tested less than two points loading in the loading frame. The behaviors of such beams were studied in terms of load carrying capacity, load-deflection behavior and cracking patterns. From the test results it is concluded that the ultimate load carrying capacity of the R.C.C. beam strengthened with CFRP sheets increased in the range of 13.01% to 55.32%. Among all the strengthening schemes, the strengthening with CFRP around and inside the opening was found very effective in improving the ultimate load carrying capacity of beam.
Experimental Investigation of Axial Capacity and Energy Absorption of SFRC Co...IJMERJOURNAL
ABSTRACT: This paper presents the results of the experimental study on the axial compressive behavior of steel fiber reinforced concrete (SFRC) wrapped with fiber reinforced polymer (FRP). A total of 18 concrete cylinders were tested under axial compression. The effects of steel fiber parameters were investigated which includes fiber aspect ratio (AR) and fiber volume fraction (VF). The concrete cylinders were divided into groups of confined and unconfined ones. In accordance with previous study, it was found that, FRP confined cylinders showed greater axial stress than that of unconfined specimens. Although the presence of steel fiber increases the peak axial stresses for both confined and unconfined group of specimens, but no significant change of peak axial stress (and peak strain) has been observed in both confined and unconfined group due to increase of fiber volume ratio. But with the increase of fiber aspect ratio, the peak axial stresses of both unconfined and FRP-confined cylinders were found to slightly decrease. It was also observed that, concrete specimens reinforced with internal steel fiber absorbed much higher energy than that of unreinforced ones.
Strengthening of reinforced concrete beam using steel fiber at different dept...eSAT Journals
Abstract
This paper presents the results of an experimental investigation for enhancing the shear and ultimate strength capacities of reinforced concrete (RC) beams using steel fiber at different depths. Ultimate loads, load-deflection curves, cracking and crushing patterns have been compared with those of the RC beams without steel fiber henceforth noted as controlled beam. A total of four sets of experiments each having three concrete beams, one set control beam and three sets with randomly distributed discrete steel fiber at different depths henceforth noted as fiber reinforced concrete (FRC) beam, were performed to determine the most economical structure in the perspective of ultimate strength and shear capacity. From the test results, it was found that incorporation of steel fiber in RC beams have shown to be effective in enhancing the shear strength capacity. It has also been observed that the strength increases with the use of varying depth of steel fiber. Beam strengthened using this scheme has shown 20% increase in shear strength and ultimate load in comparison to controlled beam.
Key Words: Reinforced Concrete Beams, High Strength Concrete, Steel fibers, strengthening
Research Inventy : International Journal of Engineering and Scienceresearchinventy
Research Inventy : International Journal of Engineering and Science is published by the group of young academic and industrial researchers with 12 Issues per year. It is an online as well as print version open access journal that provides rapid publication (monthly) of articles in all areas of the subject such as: civil, mechanical, chemical, electronic and computer engineering as well as production and information technology. The Journal welcomes the submission of manuscripts that meet the general criteria of significance and scientific excellence. Papers will be published by rapid process within 20 days after acceptance and peer review process takes only 7 days. All articles published in Research Inventy will be peer-reviewed.
An experimental investigation was conducted to investigate the behavior of ultra-high strength reactive concrete (RPC) columns before and after strengthening with carbon fiber reinforced polymer (CFRP) sheets jacketing under eccentric axi al load. Twelve columns were tested up to failure, strengthened and retested to examine strengthening efficiency and to evaluate the effects of variation of the concrete type (normal or RPC), presence of steel fibers and main steel reinforcement ratio. Experimental results showed that CFRP jacketing increases the ultimate failure load of strengthened columns up to 185%, highly stiffens them (reduces lateral displacements) and allow more ductile failure than the original columns. Also, inclusion of steel fibers in RPC columns increases failure loads up to 86%, prevents palling of the concrete cover and increase the ductility.
Flexure Behaviour of Ferrocement Strengthened RC beamsIEI GSC
Presentation on Flexure Behaviour of Ferrocement Strengthened RC beams by Akshay Dhariwal & Prof Sunil Raiyani, Institute of Technology, Nirma University, Ahmedabad at #33NCCE 33rd National Convention of Civil Engineers at #IEIGSC
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Flexural behaviour of reinforced cement concrete beam wrapped with gfrp sheeteSAT Publishing House
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
“Strengthening Of PCC Beams by Using Different Types of Wire Mesh Jacketing”IJMER
This paper presents the effect of the use of different types of wire mesh jacketing to the PCC
beams. The experimental work is mainly concerned with the study of flexural strength of concrete by
different types of wire mesh jacketing. This study brings out the importance of use of strengthening of
existing structure technology by using locally available wire mesh. In this paper, the beams of plain
cement concrete are bonded with locally available wire mesh to strengthen of structural member for
increase its strength. The method mention in this paper is most suited for strengthening and retrofitting
due to their easy availability, economy and their property of being cast to any shape without needing
significant formwork.
Welcome to International Journal of Engineering Research and Development (IJERD)IJERD Editor
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
International Journal of Engineering Research and DevelopmentIJERD Editor
Electrical, Electronics and Computer Engineering,
Information Engineering and Technology,
Mechanical, Industrial and Manufacturing Engineering,
Automation and Mechatronics Engineering,
Material and Chemical Engineering,
Civil and Architecture Engineering,
Biotechnology and Bio Engineering,
Environmental Engineering,
Petroleum and Mining Engineering,
Marine and Agriculture engineering,
Aerospace Engineering.
Shear and Flexural Behaviour of R.C.C. Beam With Circular Opening Strengthene...IJERA Editor
This paper explores the behavior of R.C.C. beam with circular opening strengthened by CFRP sheets. In this experimental work five beams were casted, one beam without opening (i.e. solid beam) and one with circular post opening and considered as control beams. The remaining three beams were externally strengthened by Carbon fiber reinforced polymer (CFRP) sheets with different strengthening schemes i.e. around the opening, inside the opening. These beams were simply supported and tested less than two points loading in the loading frame. The behaviors of such beams were studied in terms of load carrying capacity, load-deflection behavior and cracking patterns. From the test results it is concluded that the ultimate load carrying capacity of the R.C.C. beam strengthened with CFRP sheets increased in the range of 13.01% to 55.32%. Among all the strengthening schemes, the strengthening with CFRP around and inside the opening was found very effective in improving the ultimate load carrying capacity of beam.
Experimental Investigation of Axial Capacity and Energy Absorption of SFRC Co...IJMERJOURNAL
ABSTRACT: This paper presents the results of the experimental study on the axial compressive behavior of steel fiber reinforced concrete (SFRC) wrapped with fiber reinforced polymer (FRP). A total of 18 concrete cylinders were tested under axial compression. The effects of steel fiber parameters were investigated which includes fiber aspect ratio (AR) and fiber volume fraction (VF). The concrete cylinders were divided into groups of confined and unconfined ones. In accordance with previous study, it was found that, FRP confined cylinders showed greater axial stress than that of unconfined specimens. Although the presence of steel fiber increases the peak axial stresses for both confined and unconfined group of specimens, but no significant change of peak axial stress (and peak strain) has been observed in both confined and unconfined group due to increase of fiber volume ratio. But with the increase of fiber aspect ratio, the peak axial stresses of both unconfined and FRP-confined cylinders were found to slightly decrease. It was also observed that, concrete specimens reinforced with internal steel fiber absorbed much higher energy than that of unreinforced ones.
Strengthening of reinforced concrete beam using steel fiber at different dept...eSAT Journals
Abstract
This paper presents the results of an experimental investigation for enhancing the shear and ultimate strength capacities of reinforced concrete (RC) beams using steel fiber at different depths. Ultimate loads, load-deflection curves, cracking and crushing patterns have been compared with those of the RC beams without steel fiber henceforth noted as controlled beam. A total of four sets of experiments each having three concrete beams, one set control beam and three sets with randomly distributed discrete steel fiber at different depths henceforth noted as fiber reinforced concrete (FRC) beam, were performed to determine the most economical structure in the perspective of ultimate strength and shear capacity. From the test results, it was found that incorporation of steel fiber in RC beams have shown to be effective in enhancing the shear strength capacity. It has also been observed that the strength increases with the use of varying depth of steel fiber. Beam strengthened using this scheme has shown 20% increase in shear strength and ultimate load in comparison to controlled beam.
Key Words: Reinforced Concrete Beams, High Strength Concrete, Steel fibers, strengthening
Experimental study on Torsion behavior of Flange beam with GFRPIJSRD
The Study deals with experimental study using glass fiber polymers in civil science. Repairing represents an important aspect of the construction industry and its importance is increasing due to surrounding conditions or geoenvironmental degradations, increased service loads, reduced ability (to hold or do something) due to (old/allowing to get old/getting older), worsening because of poor construction materials and work quality’s and need for seismic-related have demanded the need for repair and rehabilitation of existing structures. Fiber reinforced polymers has been utilized effectively as a part of numerous applications such as low weight, high quality and capacity to last. Numerous past examination chips away at torsion strengthening were centered on strong rectangular RC Beams with distinctive strip designs and diverse sorts of fiber. Distinctive models were produced to torsion test for strengthening of RC beams and effectively utilized for approval of the test works.In the present work test study was done with a specific end goal to have a superior comprehension the conduct of torsion reinforcing of strong RC flanged T-Beam. A RC T-beam is deliberately examined and intended for torsion like a RC rectangular beam; the impact of cement on flange is disregarded by codes. In the present study impact of width in changing so as to oppose torsion is concentrated on flange width of controlled bars. Alternate specification considered is reinforcing and fiber orientations.
IJERA (International journal of Engineering Research and Applications) is International online, ... peer reviewed journal. For more detail or submit your article, please visit www.ijera.com
Behaviour of Steel Fibre Reinforced Concrete Beam under Cyclic LoadingIOSR Journals
Abstract: This paper describes the influence of steel fibre distribution on the ultimate strength of concrete
beams. An experimental & analytical investigation of the behaviour of concrete beams reinforced with
conventional steel bars and steel fibres under cyclic loading is presented. It is now well established that one of
the important properties of steel fibre reinforced concrete (SFRC) is its superior resistance to cracking and
crack propagation. As a result of this ability to arrest cracks, fibre composites possess increased extensibility
and tensile strength, both at first crack and at ultimate load and the fibres are able to hold the matrix together
even after extensive cracking. The net result of all these is to impart to the fibre composite pronounced post –
cracking ductility which is unheard of in ordinary concrete. The transformation from a brittle to a ductile type
of material would increase substantially the energy absorption characteristics of the fibre composite and its
ability to withstand repeatedly applied, shock or impact loading. Tests on conventionally reinforced concrete
beam specimens, containing steel fibres in different proportions, have been conducted to establish loaddeflection
curves. It was observed that SFRC beams showed enhanced properties compared to that of RC beams
with steel fibres. The experimental investigations are validated with the analytical studies carried out by finite
element models using ANSYS.
Keywords: Steel fiber, concrete, properties, crack, ductility, technology.
Experimental Behavior of RC Beams Strengthened by Externally Bonded CFRP with...IJERDJOURNAL
Abstract:- Carbon fiber-reinforced polymers (CFRP) laminates, or plates, offer very high-strength potential; however, handling of long pieces of these flexible plates can present challenges under field conditions. The development of methods for splicing CFRP plates will enhance the versatility and Practicality of using these materials in field applications. This paper studies the efficiency of CFRP lap splice in externally bonded CFRP flexural strengthened reinforced concrete beams. Seven half-scale beams with different conditions were tested in two-point bending until failure. Two groups were tested; the first one includes control specimens: the first without CFRP strengthening, the second strengthened with full length and without splice, and the third with cutoff at middle of the beam. All specimens in the second group having cut-off at the middle and with lap splice lengths equal 300, 450, 600, 900 mm. respectively on each side of the cut-off. The study illustrates the effect of confinement on the first crack load, failure load, mid-span deflection, and strain in both reinforcement and CFRP. The failure load was also predicted analytically by CEB-FIP (1993), adopting the traditional sectional analysis for strain compatibility. Instead of strain measuring, three accurate bond-slip models are used to provide accurate prediction for the contribution of CFRP in the flexural capacity of the strengthened beam since all strengthened beams are failed by interfacial debonding of CFRP.
Experimental behavior of circular hsscfrc filled steel tubular columns under ...eSAT Journals
Abstract
This paper presents an outlook on experimental behavior and a comparison with predicted formula on the behaviour of circular
concentrically loaded self-consolidating fibre reinforced concrete filled steel tube columns (HSSCFRC). Forty-five specimens were
tested. The main parameters varied in the tests are: (1) percentage of fiber (2) tube diameter or width to wall thickness ratio (D/t
from 15 to 25) (3) L/d ratio from 2.97 to 7.04 the results from these predictions were compared with the experimental data. The
experimental results) were also validated in this study.
Keywords: Self-compacting concrete; Concrete-filled steel tube; axial load behavior; Ultimate capacity.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
1. International Journal of Research in Advent Technology, Vol.3, No.6, June 2015
E-ISSN: 2321-9637
94
A Study on Hybrid FRP Wrapped Axially Loaded RC Capsule
Column
Saravanan S1
, Sakthieswaran N2
, Shiny Brintha G3
1
PG Scholar (Structural Engineering), Regional Centre of Anna University Tirunelveli Region, Tamilnadu, India.
2
Dept. of Civil Engg, Regional Centre of Anna University Tirunelveli Region, Tamilnadu, India.
Email:ssaravanan38@gmail.com
Abstract- The use of fiber reinforced polymer (FRP) materials for structural repair and strengthening has been continuously
increasing in recent years, due to several advantages associated with these composites when compared to conventional materials
like steel. The study is undertaken to find out the strength of the columns by adopting hybrid FRP rovings. Four chosen
wrapping patterns are wrapped around the column of different specimens of same size are preferred for the research and the
strength obtained from the wrapping pattern is compared with that of the unconfined column. The cross section of the column
measuring up to 150x380mm and shorter face radius measuring 75mm is casted. Three types of FRP are used in the
experimental stages namely Glass, Basalt and Jute fibres. After thorough analysis the specimen CBGJ wrapped with Basalt,
Glass and Jute fibre has got more axial compressive strength than other specimen chosen for study and also CBGJ wrapping
pattern has got 25% more compressive strength than the unconfined column.
Index Terms-BFRP, GFRP, Jute, Strengthening, Axial compression.
1. INTRODUCTION
Over the years, engineers have used different methods and
techniques to retrofit existing structures by providing external
confining stresses. For the past few years, the concept of
jacketing has been investigated to provide such forces [1].
Externally applied jackets, have been used as a reinforcement
to contain concrete for different reasons. Engineers have used
traditional materials such as wood, steel, and concrete to
confine and improve the structural behavior of concrete
members. Section enlargement is one of the methods used in
retrofitting concrete members. This method is as old as the
concrete industry itself. Steel jacketing has been proven to be
an effective technique to enhance the seismic performance of
old bridge columns (Priestley et al.1996) [2]. Nowadays, the
use of fiber reinforced polymer has been considered the best
strengthening material due to their excellent performance in
the field of strengthening, repairing and retrofitting of
concrete structures especially in columns. The use of FRP
composites as a jacketing material around the square concrete
columns can increase the strength and ductility of square
columns [3]. Such strengthening technique has proved to be
very effective in enhancing their ductility and axial load
capacity. However, most of the available studies on the
behavior of FRP confined concrete columns have
concentrated on circular shaped columns with normal
strength. The data available for columns of square or
rectangular cross sections have increased over recent years but
are still limited [5-7].
Fiber Reinforced Polymers (FRP) has emerged over
the last decade as a new material to be used in structural
engineering, due to its attractive mechanical properties.FRP
systems, however, have recently gained world-wide
recognition as strengthening measures to increase the ductility
and load carrying capacity of existing structural members. As
a result, these materials have shown great potential in
becoming an attractive alternative to concrete and even steel
jackets. One important application of this composite
retrofitting technology is the use of FRP jackets to provide
external confinement to RC columns when the existing
internal transverse reinforcement is inadequate. The
application of FRP in the construction industry can eliminate
some unwanted properties of high strength concrete, such as
its brittle behaviour.FRP is particularly useful for
strengthening columns and other unusual shapes.
1.1 Scope and Objective
The Main Endeavour of this work is to experimentally
scrutinize the effects of upgrading the load carrying capacity
of Reinforced Concrete Capsule shaped columns subjected to
axial compression by confining with GFRP, BFRP, Jute
flexible wraps.
The objectives of this study are as follows:
i. To evaluate the effectiveness of external Hybrid FRP
strengthening for Capsule shaped concrete columns.
1.2 External Confinement with FRP
The application of FRP in the construction industry can
eliminate some unwanted properties of concrete, such as
the brittle behaviour of high-strength concrete. FRP is
particularly useful for strengthening columns and other
unusual shapes (Li, Hadi 2003) [4]. As already mentioned, the
use of FRP materials in concrete compression members
2. International Journal of Research in Advent Technology, Vol.3, No.6, June 2015
E-ISSN: 2321-9637
95
produces an increase in strength depending on the FRP
properties (material type, strength, thickness etc.), on the
concrete properties, and prevalently on the shape of the
transverse cross-section (Campione, Miraglia 2003).
Bonding hoop FRP to the column surface enhances axial
load capacity and ductility of columns. The hoop FRP
resists lateral deformations due to the axial loading,
resulting in a confining stress to the concrete core, delaying
rupture of the concrete and thereby enhancing both the
ultimate compressive strength and the ultimate compressive
strain of the concrete.
2. EXPERIMENTAL INVESTIGATION
2.1 Specimen Layout
A total of 4 FRP wrapped and one unconfined control
concrete columns with dimensions of 150x 380mm with
shorter face radius 75mm were prepared and tested under
axial compression loading. The main experimental parameters
were included different layers of hybrid FRP with different
pattern.
Fig. 1 Wrapping Pattern of Specimen
Table 1 Specimen Wrapping Configuration
Specimen
ID
CC CGJ CBJ CGBJ CBGJ
Wrap strip
No
Layer Layer Layer Layer Layer
1 1 1 2 1 2 1 2 1 2
i - - G G B B G B B G
ii - - J J J J J J J J
iii - - G G B B G B B G
iv - - J J J J J J J J
v - - G G B B G B B G
G- GFRP B - BFRP J- JUTE
Width of wrapping for all strips was 100mm.
2.2 Material Properties
2.2.1 Internal steel reinforcement
Details of the internal reinforcing bars are shown in fig
2. 4nos of 16mm dia and 2nos of 12mm dia bars used as main
reinforcement and 8mm dia bars used as stirrups 200mm C/C
spacing.
Fig. 2 Reinforcement Details
2.2.2 Concrete
Portland Pozzolana cement , natural sand (fine
aggregate) and crushed coarse aggregate 20mm & 10mm size
were used for the concrete mix. The mix proportion of M20 is
3. International Journal of Research in Advent Technology, Vol.3, No.6, June 2015
Fig. 3 Location of Strain gauge
1:1.33:3.14 by weight of cement, sand, coarse
aggregate and water cement ratio 0.5 was adopted.
2.2.3 FRP system
Glass FRP, Basalt FRP, Jute rovings were used as
confinement reinforcement.
2.2.4 Strain gauge
The strain gauge type was BICSA
length of 10mm fixed in the longitudinal reinforcement. The
detail of the locations of strain gauges on steel reinforcements
shown in fig 3
3. RESULT AND DISCUSSION
3.1 Observed behaviour
At the early stages of loading of the confined specimens, the
noise related to the micro cracking of concrete c
evident. At the latter stages of loading, a plastic
was produced by the stretching of the FRP sheets.
3.2 Axial Load-Displacement Behaviour
The variation of displacement with that of the load was plotted
for all the specimens as shown in Fig 4. From the load
displacement curves it is observed that the unwrapped
specimen CC failed at a load of 750kN with a displacement of
1.24mm. The FRP wrapped specimens CGJ, CBJ, CGBJ and
International Journal of Research in Advent Technology, Vol.3, No.6, June 2015
E-ISSN: 2321-9637
Fig. 3 Location of Strain gauge
1:1.33:3.14 by weight of cement, sand, coarse
aggregate and water cement ratio 0.5 was adopted.
Glass FRP, Basalt FRP, Jute rovings were used as
The strain gauge type was BICSA-10 with a gauge
reinforcement. The
detail of the locations of strain gauges on steel reinforcements
At the early stages of loading of the confined specimens, the
noise related to the micro cracking of concrete core was
evident. At the latter stages of loading, a plastic-like sound
was produced by the stretching of the FRP sheets.
The variation of displacement with that of the load was plotted
. From the load –
displacement curves it is observed that the unwrapped
specimen CC failed at a load of 750kN with a displacement of
1.24mm. The FRP wrapped specimens CGJ, CBJ, CGBJ and
CBGJ failed at loads of 850kN, 900kN, 950kN, 1000kN with
the corresponding displacements of 1.46mm, 1.49mm,
1.608mm and 1.76mm.
Fig.4 Axial load – displacement of
The specimen CBGJ has
compared to controlled specimen and other specimen.
The Basalt fiber has produce larger
compared to glass fibre.
3.3 Axial load- Strain behaviour
The behaviour of axial load vs strain for specimen CC,
CBJ, CGBJ, CBGJ are as shown in fig 5
Fig 5 Axial Load
0
100
200
300
400
500
600
700
800
900
1000
0.000.100.200.300.400.500.600.700.80AxialLoadinkN
Displacemant in mm
0
100
200
300
400
500
600
700
800
900
1000
0 1000 2000
AxialLoadinkN
Strainx10
International Journal of Research in Advent Technology, Vol.3, No.6, June 2015
96
CBGJ failed at loads of 850kN, 900kN, 950kN, 1000kN with
corresponding displacements of 1.46mm, 1.49mm,
displacement of Specimens
specimen CBGJ has higher displacement
compared to controlled specimen and other specimen.
The Basalt fiber has produce larger displacement
Strain behaviour
of axial load vs strain for specimen CC, CGJ,
e as shown in fig 5.
Axial Load – Strain curves
0.800.901.001.101.201.301.401.501.601.701.801.90
Displacemant in mm
CC
CGJ
CBJ
CGB
J
2000 3000 4000 5000
Strainx10-6
CC
CGJ
CBJ
CGBJ
CBGJ
4. International Journal of Research in Advent Technology, Vol.3, No.6, June 2015
E-ISSN: 2321-9637
97
The specimen CBJ has observed higher strain with lower load
and specimen CBGJ has observed lower strain with higher
load.
3.4 Comparison of Compressive Strength
From the graphs shown in the Figures 6 and 7 it is
found that due to the high tensile strength of the hybrid FRP
confinement, the compressive strength of column specimen
CGJ is increased by 11.76% when compared with specimen
CC. And also the compressive strength of column specimen
CBJ is increased by 16.67% when compared with specimen
CC. The compressive strength of column specimen CGBJ is
increased by 21.06% when compared with specimen CC. The
compressive strength of column specimen CBGJ is increased
by 25% when compared with specimen CC.
Fig.6 Comparison of Compressive Strength
Fig.7 Comparison of % Increase in Compressive Strength
4. CONCLUSION
This research was aimed to propose and to investigate the new
strengthening technique of strip pattern for hybrid FRP
confinement of capsule shaped RC columns. The following
conclusions can be drawn from the test results.
The wrapping of FRP has increased the compressive strength
and ductility compared to the specimen without wrapping.
The compressive strength of column specimen CGJ is
increased by 11.76% when compared with control specimen
CC and the maximum strain is reached 0.002386 at the axial
load of 850kN. The compressive strength of column specimen
CBJ is increased by 16.67% when compared with control
specimen CC and the maximum strain is reached 0.005048 at
the axial load of 900kN. The compressive strength of column
specimen CGBJ is increased by 21.06% when compared with
control specimen CC and the maximum strain is reached
0.004365 at the axial load of 950kN. The compressive
strength of column specimen CBGJ is increased by 25% when
compared with control specimen CC and the maximum strain
is reached 0.003707 at the axial load of 1000kN.
The hybrid FRP wrapping containing Basalt, Glass,
and Jute absorbs more strength than the other hybrid FRP
wrapping patterns involved in this research. The wrapping
procedure adopts capsule shaped columns because if we use
rectangular shaped columns it may debond the corner of the
column. There is enough literature available to justify the fact
that rectangular shaped columns have damaged the column in
the previous research studies. The capsule shaped column
wrapping is done in parts of the column through stripping
pattern in the vulnerable region of the column alone to reduce
the cost of the FRP materials involved in stripping the
column.
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[1] Yousef A. Al-Salloum (2007) ‘Influence of edge
sharpness on the strength of square concrete columns
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CGJ
11.76
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25
0
5
10
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20
25
30
CompressiveStrengthin%
Specimen ID
CC
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CGJ
24.64
CBJ
26.09
CGBJ
27.54
CBGJ
28.99
0
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35
CompressiveStrengthN/mm2
Specimen ID
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E-ISSN: 2321-9637
98
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