Beam column joints in concrete framed structure have been identified as critical member for transferring forces and bending moments between beams and columns. The change of moments in beam and columns across the joint region, under loadings, induces high shear force and stresses as compared with other adjacent members. The shear failure caused is often brittle in nature which is not an acceptable structural performance. Retrofitting enhances the moment carrying capacity of joint. Often beam column joints need to be strengthened. Author proposes use of ferrocement for retrofitting as wrapping technique, cost effective alternative to costly FRP wrapping technique. In this present research study, modelling & comparison of Beam-Column joint with and without ferrocement jacket is carried out by finite element method using software ANSYS APDL. The comparison shows enhanced performance of the jacketed model over Non jacketed in terms of stresses, ultimate load carrying capacity.
Retrofitting of RCC structural members is necessary to prevent further distress in concrete. Retrofitting of RCC members should start with investigation and diagnosis of cracks and then by applying suitable retrofitting measures.
Retrofitting of RCC structural members is necessary to prevent further distress in concrete. Retrofitting of RCC members should start with investigation and diagnosis of cracks and then by applying suitable retrofitting measures.
Capacity of strengthened Reinforced concrete columnsKhaled Mahmoud
this presentation show main points of research focused on the analysis of concrete and steel jackets to get simple equations for design. Therefore, an experimental program consists of twenty columns strengthened with concrete jackets and steel jackets are performed. The results were compared with some of the design equations in available literature. These equations were modified to match the theoretical and experimental results. Recommendations for column behavior after strengthening are presented to help structural engineers to maximize the benefits of strengthening operation.
Repair and Retrofit on Beam and Column Jointsamerald24
A research experiment has been conducted on the structural performance of repaired minor damaged reinforced concrete beam and column Joints using composite known as CFRP (Carbon Fiber Reinforced Polymer) under simulated cyclic 2D loadings to find the practical lamination repair scheme for flexural strengthening, shear strengthening, and joint strengthening.
Strengthening Of Beams for flexure Using FRPReham fawzy
Introduction : ( What is FRP ? ) .
Fiber Material Behavior .
FRP STRENGTHENING SYSTEMS .
Analysis and design .
Application requirements for repair and strengthening works .
Retrofitting of Beam-Column Joint using Carbon Fibre Reinforced Polymer and G...Satyam Vijay Bhosale
Retrofitting of an existing building is immensely essential for the deteriorated and damaged structure in Engineering and Medical fields. It refers to endowing the structure with a service level higher than that initially planned by modifying the structures, not necessarily damage area. Beam-column joints, being the lateral and vertical load transferring connections in reinforced concrete structures are particularly vulnerable to failures and hence the satisfactory performance of these joints is key to control the performance of connecting structural members during any event.
The project involves the study of the load carrying capacity of the beam-column joint after the application of the CFRP (Carbon Fiber Reinforced Polymer) and GFRP (Glass fibre Reinforced Polymer) sheets. Five beam-column joint models were cast out of which one model was the control specimen and others were cast for the purpose of the retrofitting. Four specimens were retrofitted by L-shape and straight configurations. The project focused on the effect of using the CFRP sheets and GFRP sheets for enhancing the strength and ductility of the beam-column joint. The wraps were provided to prevent the shear failure of the beam-column joint. The failure criteria including ultimate capacity, mode of failure, initial stiffness, ductility and developed ultimate strain in the reinforcing steel and respective sheet were considered and then compared.
This is a ppt. on protection from corrosion of steel reinforcement in concrete structures. I had prepared this as a part of my class seminar. I made this by referring to the books on Concrete Technology by M.S.Shetty and M.L.Gambhir
Strength and durability of concrete - Repair and rehabilitation of structures...Shanmugasundaram N
Quality assurance for concrete – Strength, Durability and Thermal properties, of concrete - Cracks, different types, causes – Effects due to climate, temperature, Sustained elevated temperature, Corrosion - Effects of cover thickness.
Capacity of strengthened Reinforced concrete columnsKhaled Mahmoud
this presentation show main points of research focused on the analysis of concrete and steel jackets to get simple equations for design. Therefore, an experimental program consists of twenty columns strengthened with concrete jackets and steel jackets are performed. The results were compared with some of the design equations in available literature. These equations were modified to match the theoretical and experimental results. Recommendations for column behavior after strengthening are presented to help structural engineers to maximize the benefits of strengthening operation.
Repair and Retrofit on Beam and Column Jointsamerald24
A research experiment has been conducted on the structural performance of repaired minor damaged reinforced concrete beam and column Joints using composite known as CFRP (Carbon Fiber Reinforced Polymer) under simulated cyclic 2D loadings to find the practical lamination repair scheme for flexural strengthening, shear strengthening, and joint strengthening.
Strengthening Of Beams for flexure Using FRPReham fawzy
Introduction : ( What is FRP ? ) .
Fiber Material Behavior .
FRP STRENGTHENING SYSTEMS .
Analysis and design .
Application requirements for repair and strengthening works .
Retrofitting of Beam-Column Joint using Carbon Fibre Reinforced Polymer and G...Satyam Vijay Bhosale
Retrofitting of an existing building is immensely essential for the deteriorated and damaged structure in Engineering and Medical fields. It refers to endowing the structure with a service level higher than that initially planned by modifying the structures, not necessarily damage area. Beam-column joints, being the lateral and vertical load transferring connections in reinforced concrete structures are particularly vulnerable to failures and hence the satisfactory performance of these joints is key to control the performance of connecting structural members during any event.
The project involves the study of the load carrying capacity of the beam-column joint after the application of the CFRP (Carbon Fiber Reinforced Polymer) and GFRP (Glass fibre Reinforced Polymer) sheets. Five beam-column joint models were cast out of which one model was the control specimen and others were cast for the purpose of the retrofitting. Four specimens were retrofitted by L-shape and straight configurations. The project focused on the effect of using the CFRP sheets and GFRP sheets for enhancing the strength and ductility of the beam-column joint. The wraps were provided to prevent the shear failure of the beam-column joint. The failure criteria including ultimate capacity, mode of failure, initial stiffness, ductility and developed ultimate strain in the reinforcing steel and respective sheet were considered and then compared.
This is a ppt. on protection from corrosion of steel reinforcement in concrete structures. I had prepared this as a part of my class seminar. I made this by referring to the books on Concrete Technology by M.S.Shetty and M.L.Gambhir
Strength and durability of concrete - Repair and rehabilitation of structures...Shanmugasundaram N
Quality assurance for concrete – Strength, Durability and Thermal properties, of concrete - Cracks, different types, causes – Effects due to climate, temperature, Sustained elevated temperature, Corrosion - Effects of cover thickness.
Effect of Wire Mesh Orientation on Strength of Beams Retrofitted using Ferroc...CSCJournals
Various retrofitting techniques are used in field and out of all plate bonding technique is considered as the best. In this technique, the plates of different materials viz CFRP, GFRP, ferrocement etc are bonded to the surface of structural member to increase its strength. Ferrocement sheets are most commonly used as retrofitting material these days due to their easy availability, economy, durability, and their property of being cast to any shape without needing significant formwork. In the present work, effect of wire mesh orientation on the strength of stressed beams retrofitted with ferrocement jackets has been studied. The beams are stressed up to 75 percent of safe load and then retrofitted with ferrocement jackets with wire mesh at different orientations. The results show that the percent increase in load carrying capacity for beam retrofitted with ferrocement jackets with wire mesh at 0, 45, 60 degree angle with longitudinal axis of beam, varies from 45.87 to 52.29 percent. Also a considerable increase in energy absorption is observed for all orientations. However, orientation at 45 degree shows higher percentage increase in energy absorption followed by 60 and 0 degree respectively.
A Study of R. C. C. Beam Column Junction Subjected To QuasiStatic (Monotonic)...IOSR Journals
Abstract - Beam and column where intersects is called as joint or junction. The different types of joints are
classified as corner joint, exterior joint, interior joint etc. on beam column joint applying quasi-static loading on
cantilever end of the beam. and study of various parameters as to be find out on corner and exterior beam
column joint i.e. maximum stress, minimum stress, displacement and variation in stiffness of beam column joint
can be analyzed in Ansys software ( Non-Linear FEM Software) Significant experimental research has been
conducted over the past three decades on hysteretic behavior of beam-column joints of RC frames under cyclic
displacement loading. The various research studies focused on corner and exterior beam column joints and
their behavior, support conditions of beam-column joints. Some recent experimental studies, however,
addressed beam-column joints of substandard RC frames with weak columns, poor anchorage of longitudinal
beam bars and insufficient transverse reinforcement. the behavior of exterior beam column joint is different
than the corner beam column joint
The awareness on seismic design for reinforced cement concrete (RCC) beam-column (BC) joint was started with publication of ACI-ASCE 352 report in 1976. In past earthquakes, several RCC buildings were suffered by severe damages/collapses. These failures were occurred due to the usage of poor detailing in joint and insufficient anchorage of beam longitudinal bars. The research on the BC joint was started in 1967 and extensive research has been carried out on studying the behaviour of RCC joints under seismic condition through experimental and analytical studies. There are different methods of reinforcing techniques have been developed over the years and their main aim was to determine the effective reinforcing technique for beam-column joint which include easy to adopt, effective performance, economical and cost-effective. This paper gives an overview of the use of different reinforcing techniques used in beam-column joint so far. The objective of this paper is to critically review the different techniques developed so far with reference to the effect of each technique and outlined the salient features of each technique.
EXPERIMENTAL INVESTIGATION OF REINFORCEMENT COUPLERS AS REPLACEMENT OF BENT BARrk pandey
In reinforced concrete structures, it is essential to enhance the performance of
beam–column joints in moderate and severe seismic susceptibility areas. An attempt has
been made to study and evaluate the performance of exterior beam–column joint using
proper reinforcement anchorage and joint core detail. The anchorages are detailed as per
ACI-352 (Mechanical anchorage), ACI-318 (900Standard bent anchorages) and IS-456 along
with confinement as per IS-13920. Significant improvements were observed in seismic
performance, ductility and strength while using stirrups bar in combination with mechanical
anchorage detail for higher seismic prone areas, apart from resolution to reducing
congestion of reinforcement in joint core. To assess the performances of anchorages and
joint details, three groups of three specimens each were tested under monolithic loading.
The test results are evaluated and presented in this paper.
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
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![International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 07 Issue: 05 | May 2020 www.irjet.net p-ISSN: 2395-0072
© 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 337
2. OBJECTIVES OF STUDY
The article represents analytical study to evaluate additional moment resisting capacity of the joint. Progression from rigid
joint to pin joint/plastic hinge. Performance of RC beam-column joints retrofitted with ferrocement jacket under flexural
loading. The article comments on Comparative study of the bare RC beam-column joints with and without ferrocement jacket
for its structural behaviour.
3. LITERATURE REVIEW
The unique properties of ferrocement have been investigatedextensivelybymanyresearchers.Thefollowingliteraturesurvey
includes summary of research papers presented in popular journals on topics similar to current field of study.
B. Venkatesan and R. Ilangovan performed [1], study using four specimens. Specimens were tested under cyclic loading in
cantilever portion using hydraulic push and pull jack in which two as reference specimen and remaining two used for
strengthen specimen with the Ferrocement laminate is a composite material collective with weld mesh and woven mesh and
they found that capacity of the retrofitted specimen is 66% more than that of the ductile control specimen.
P. Kannan, S. Sivakumar, and K. R. Bindhu [2], in their study, six scaled down models of the beam-column joint of a non-
seismically designed structure were prepared. Retrofitting were done in two form conventional and advanced. In advanced
technique the corner joint were rounded. In the result it was found that both techniquewere33.33%moreefficientincarrying
ultimate load capacity compared to non-retrofitted model.
Nassif H. H. and Najm H [3], the adding of a thin layer of ferrocement to a concretebeamalsoenhancesitsductility andcracking
strength. An increase in the number of layers leads to enhancement in the cracking stiffness of the composite beams.
K. R. Bindhu, P. M. Sukumar, and K. P. Jaya [4], tested their specimen under two different axial loads to evaluate the effect of
axial load on the behaviour of joints. According to them an increase in the column axial load improves the load carrying
capacity and stiffens the joints but reduces the load carrying capacity and ductility.
C. V. R. Murty, D. C. Rai, K. K. Bajpai, and S. K. Jain [5], Have tested the exterior beam column joint subject to static cyclic loading
by changing the anchorage detailing of beam reinforcement and shear reinforcement. It was reported that the practical joint
detailing using hairpin-type reinforcement is a competitive alternative to closer ties in the joint region.
D. G. Gaidhankar, M. S. Kulkarni, and A. R. Jaiswal[6], they tested Flexural strength and loadcarryingcapacityofthe beam. They
found that strength of the beam increases when the number of mesh layers increases from 2 to 4 numbers alsothere was 60%
percent increase in load carrying capacity for that of the woven mesh.
C. G. Karayannis, C. E. Chalioris, and G. M. Sirkelis[7], the effect of retrofittingofRCexteriorbeam-columnjointswithreinforced
concrete jackets. The joints were initially loaded to cyclic loading and then retrofitted using thin RC jackets and they retested
under the same load sequence. Test results indicated that the seismic performance of the retrofitted specimens was fully
restored and, in some cases, substantially improved with respect to the performance of the same specimens in the initial
loading, since they exhibited higher values of load capacity and hysteretic energy dissipation.
G. S. Dhanoa, J. Singh, and R. Singh[8], they studied the retrofitting effect on the beam casted. The Retrofitting of the beams by
ferro cement technique using two different welded mesh wires increased the load carrying capacity by 35% and 45% for
stressed beams and 55% and 70% for overloading beams.
N. Karthika and N. M. Azhar[9], they studied the strengthening of reinforced concrete columns usingferrocementlaminates.In
The study test they results showed that the confined concrete specimens can enhance the ultimate concrete compressive
strengths and failure strains. They column retrofitted performed better in reducing the deflection and increasing the moment
carrying capacity.
4. ANALYTICAL SIMULATION PROGRAM
The nonlinear response of joint with ferrocement jacketing can be computed using the finite element method (FEM). The
graphical user interface in ANSYSprovides anefficientandpowerful environmentfor solvingmanyanchoringproblems.ANSYS
enables virtual testing of structures using computers, which is the present trend in the research and development world. This
study uses static analysis model which support RCC element in ANSYS Apdl.](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)