Flexural behaviour of interior r.c.beam column joint with and without slab under cyclic loading

IJRET: International Journal of Research in Engineering and Technology eISSN: 2319-1163 | pISSN: 2321-7308
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Volume: 03 Issue: 06 | Jun-2014, Available @ http://www.ijret.org 558
FLEXURAL BEHAVIOUR OF INTERIOR R.C.BEAM COLUMN JOINT
WITH AND WITHOUT SLAB UNDER CYCLIC LOADING
Revathi.R1
, Srisanthi .V.G2
1
Research Scholar, Department of civil engineering, Coimbatore Institute of Technology, Coimbatore– 641 014, Tamil
Nadu, India
2
Associate Professor, Department of civil engineering, Coimbatore Institute of Technology, Coimbatore – 641 014,
Tamil Nadu, India
Abstract
The behavior of reinforced concrete moment resisting frame structures in recent earthquakes all over the world has highlighted
the consequences of poor performance of beam column joints. Beam column joints in a reinforced concrete moment resisting
frame are crucial zones for the transfer of loads effectively between the connecting elements (i.e. beams and columns) in the
structure. In 1976, the design of beam column joint is first recommended and subsequently revision is carried out in the year
1985. Design specifications only for the beam column joints are given in IS 13920:1993. There is no provision for the type of
column joint whether it be Edge column, Corner column or Interior column. Effect of slab is also not considered in this code.
Hence a study and investigation is required on the beam-column joint with slab to suggest improvement in reinforcement detailing
based on influence of slab. Two scaled specimens, one Interior Beam-Column joint with slab (BCJS) and another Interior Beam-
Column joint without slab (BCJ) were made. Tests were carried out in structural laboratory and the results are discussed here.
Keywords: Column joint with slab( BCJS), Beam – Column joint without slab (BCJ), Moment resisting frame, Interior
joint, Energy dissipation, Ductility factor.
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1. INTRODUCTION
In the analysis of reinforced concrete moment resisting
frames, the joints are generally assumed as rigid. In Indian
practice, the joint is usually neglected for specific design
with attention being restricted to provision of sufficient
anchorage for beam longitudinal reinforcement. This may be
acceptable when the frame is not subjected to earthquake
loads. There have been many catastrophic failures reported
in the past 50 earthquakes, in particular with Turkey and
Taiwan earthquakes occurred in 1999, which have been
attributed to beam column joints. The poor design practice
of beam column joints is compounded by the high demand
imposed by the adjoining flexural members (beams and
columns) in the event of mobilizing their inelastic capacities
to dissipate seismic energy. Unsafe design and detailing
within the joint region jeopardize the entire structure, even if
other structural members conform to the design
requirements. Since past three decades, extensive research
has been carried out on studying the behavior of joints under
seismic conditions through experimental and analytical
studies. Various international codes of practices have been
undergoing periodic revisions to incorporate the research
findings into practice.
2. LITERATURE REVIEW
Hikmat E.Zerbe et al (1990) studied the seismic response
of connections in two bay RC frame subassemblies with a
floor. It was found that the presence of slab increases the
shear strength in the joints and was not affected by the
energy dissipation capacity in continues subassembly.
Lateral load resistance increased by as much as 30 percent at
3 percent lateral drift and degradation of stiffness. Based on
the results, the suggestion is made to include the effect of a
floor slab in the procedure for designing beam-column
connections. Gilson N.Guimaraes et al (1992) studied the
evaluation of joint-shear provisions for interior beam-
column slab connections using high-strength materials of
four interior beam column slab connections constructed with
combinations of normal and high strength and reinforcement
are presented and existing joint shear provisions are
evaluated for use in designs of connections constructed with
high strength materials. Devados Menon et al (2007)
conducted a detailed investigation of the design of RC beam-
column joints. In this study three international code of practice
like ACI 318M-02, NZ 3101:1995, pr EN1998-1 were followed
for designing the RC beam-column joints under seismic load.
The performance specimens which had details as per various
codes were compared. They concluded that there is need to
revise the code IS13920:1993. This had become inadequate in
minimum column width, column/beam flexural strength ratio,
and nominal shear strength of beam column joints and effective
shear area of joint. Burcu B.Canbolat et al (2008) conducted
an experimental investigation on seismic behaviour of
eccentric reinforced concrete beam–column-slab
connections. The study focused on the effect of eccentricity
of spandrel beams with respect to the column. Specimens
included a floor slab and transverse beam to evaluate the
effect of slab participation. Test results indicated that the
floor system significantly reduced the negative influence of
eccentricity and observed that damage was reduced. The

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joint shear stresses resisted by the connections, without
major damage was higher than the current design values.
This was due to the participation of a larger area of the joint
region in the resisting shear, which indicates that
“recommendations for design of beam column connections
in monolithic reinforced concrete structures ( ACI 352R-02)
for effective joint width are conservative”. Bindu.K.R et al
(2008) conducted a detailed investigation on the
performance of exterior beam column joints with cross-
inclined bars under Seismic loading. They investigated the
effect of inclined bars at the joint region. Four exterior beam
column joint were cast and tested under cyclic load. The
specimens which had joint reinforcement as per code IS
13920:1993 with inclined bars and the specimens without
inclined bars were tested. They concluded that the specimen
with inclined bars showed more ductility and energy
absorption capacity than specimen without inclined bars.
3. EXPERIMENTAL WORK
3.1 Material Properties
The Portland Pozzolana Cement conforming to IS: 1489 –
1991 is used. Cement was stored in a dry cool place during
the course of experimental study. Preliminary tests on
cement are conducted as per IS: 4031 – 1988. The results of
preliminary tests are given in Table 1.
Table 1 Properties of Cement
S.No Properties Test Results
1 Specific Gravity 3.15
2 Standard Consistency 33%
3 Initial Setting Time 120 Min.
4 Compressive Strength at 7 days 32.56 MPa
5 Compressive Strength at 28 days 37.85 MPa
3.2 FINE AGGREGATE
The fine aggregate used in this experimental investigation
was natural river sand confirming to zone III of IS: 383 -
1970. The details of sieve analysis of the fine aggregate are
given below in the Table 2 and properties of fine aggregate
are given in Table 3.
Table 2 Sieve Analysis of Fine Aggregate
IS Sieve Size Trai-1 Trai-2
Weight
Retained
(gms)
Cumulative
% Retained
% Weight
Passing
Weight
Retained
(gms)
Cumulative
% Retained
Weight
Retained
(gms)
4.75mm 5.50 1.10 98.90 9.30 1.86 98.14
2.36 mm 9.1 2.92 97.08 8.1 3.48 96.52
1.18 mm 29 8.72 91.28 25.7 8.62 91.38
600 m 84.5 25.62 74.38 77.5 24.12 75.88
300 m 289 83.42 16.58 298.5 83.82 16.18
150 m 75.5 98.52 1.48 71.6 98.14 1.86
75 m 6 99.72 0.28 7.1 99.56 0.44
Pan 1.4 100 0 2.2 100 0
Table 3 Properties of Fine Aggregate
1 Fineness Modulus 2.2
3 Zone III
3.3 Coarse Aggregate
Crushed granite aggregates particles passing through 20mm
and retained on 4.75mm I.S sieve was used as natural
aggregates which met the grading requirement of IS: 383 –
1970. The properties of coarse aggregate are given below in
the table 4.
Table 4 Properties of Coarse Aggregate
2 Water Absorption 0.15%
3.4 Water
Potable water available in the laboratory which satisfies
drinking standards was used for the concrete mixing and its
subsequent curing.
3.5 Mix Proportion
Indian standard Institution has brought out mix design
procedure mainly based on the work done in national
laboratories. Mix was designed for M20 grade of concrete.
These are confirmed in IS: 10262 – 1982.
The mix proportion for M20 grade of concrete was 1: 1.65:
2.65 with W/C ratio of 0.5.
3.6 Strength - Related Test for Concrete
The specimens were tested for the following test.
1. Cube compressive test
2. Cylinder splitting tensile strength test

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3.7 Cube Compressive Strength
For cube, compression testing of concrete, 150mm cubes
were used .All the cubes were tested in saturated condition,
after wiping out the surface moisture as shown Fig. 1. Three
cubes were tested at the age of 7 days and 28 days of curing
for concrete using compression testing machine of 2000 kN
capacity. Test result for compressive strength of cube is
given in table 5 and table 6.
Fig. 1 Compressive strength of cube
Table 5 Compressive Strength OF Cube at 7 Days
S.No Name of the Specimen Compressive
Strength in
N/mm2
1 Beam column joint without
slab
18.12
2 Beam column joint with slab 17.36
Table 6 Compressive Strength of Cube at 28 Days
S.No Name of the Specimen Compressive
Strength in N/mm2
1 Beam column joint
without slab
26.34
2 Beam column joint with
slab
27.36
3.8 Splitting Tensile Strength
This is an indirect test to determine the tensile strength of
cylindrical specimens. Splitting tensile strength tests were
carried out on cylinder specimens of size 150 mm diameter
and 300 mm length at the age of 28 days curing, using
compression testing machine of 2000 kN capacity. The load
was applied gradually till the specimens split and readings
were noted. The test set up for the splitting tensile strength
on the cylinder specimen is shown in Fig. 2.Test result was
given in the table 7. The splitting tensile strength has been
calculated using the following formula.
ft= 2P / DL
Where
ft – Splitting tensile strength of the specimen in Mpa
P – Maximum load in N applied to the specimen
D – Measured diameter of the specimen in mm, and
L – Measured length of the specimen in mm
Fig. 2 Split Tensile Test
Table 7 Split Tensile Strength of Cylinder at 28 Days
S.No Name of the Specimen Split tensile
Strength in N/mm2
1 Beam column joint
without slab
2.829
slab
3.112
3.9 Flexural Strength Test
Beam specimens of size 10 x10 x50 cm were cast and tested
as shown in Fig. 3 to determine the flexural strength of
concrete at the age of 28th days. The bearing surfaces of the
supporting and loading rollers are wiped clean, and any
loose sand or other material removed from the surfaces of
the specimen where they are to make contact with the
rollers. The specimen is then placed in the machine in such a
manner that the load is applied to the uppermost surface as
cast in the mould, along two lines spaced 13.3 cm apart. The
axis of the specimen is carefully aligned with the axis of the
loading device. The load is applied without shock and
increasing continuously at a rate such that the extreme fibre
stress increases at approximately 0.7kg/sq.cm/min that is at
a rate of 180kg/min. The load is increased until the
specimen fails, and the maximum load applied to the
specimen during the test is recorded.
The flexural strength of the specimen is expressed as the
modulus of rupture fb and the results are given in table 8.
Fb= PL / bd2
Where
b – measured width in cm of the specimen
d – measured width in cm of the specimen
P – maximum load in kg applied to the specimen, and
L – Measured length of the specimen in mm
Fig. 3 Tensile Strength of Concrete

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Table 8 Tensile Strength of Concrete at 28 Days
S.No Name of the Specimen Tensile
Strength in N/mm2
1 Beam column joint
without slab
6.534
slab
5.348
4. ANALYSIS OF FRAME
A four storey two bay frames including 1.5 m foundation
depth multistorey reinforced concrete building falling under
the seismic Zone – III has been analyzed using STADD.pro.
The specimens were designed for seismic load according to
IS 1893(Part I): 2002 & IS 13920: 1993. Based on the
critical combination of load, the value for bending moment,
shear force and axial forces were taken for the design of
Beam - Column joint with slab (BCJS) and Beam – Column
joint without slab (BCJ). The maximum moment occurred at
the ground floor level. Ground floor interior joint is
considered for the experimental work.
The three dimensional view of the building taken for
analysis is shown in Fig.4 and elevation is shown in Fig. 5.
Fig. 4 Three Dimensional View of the Building
Fig. 5 Elevation of Frame
5. SPECIMEN
Beam – Column joint specimen consisted of four numbers
of beam (North, South, East and West) and two numbers of
column (Top and Bottom).These are monolithically
connected at the joint. Another specimen was made as said
above with 40mm thick slab. Based on the end condition of
building the moment coefficient was calculated. Detailing of
reinforcements are based on the code Sp 34. Following Fig.
6 shows the detail of reinforcements.
It was difficult to make the test specimens to the original
scale to suit the loading arrangement facilities. Hence the
test specimens were reduced to one fourth scale .The cross
section of the reduced beam was 100 mm×100 mm and the
cross section of the reduced column was 100 mm×100 mm.
4 numbers of 10 mm ø bars were used as main bars in the
column. Transverse reinforcement in the column with 6mm
ø bars at a spacing of 40mm c/c up to 120 mm from face of
joint and 60mm c/c for middle portion of 180mm and then
spacing of 40mm c/c for the remaining length. 2 numbers of
8 mm diameter bars as tension reinforcement and 2 numbers
of 8 mm diameter bars as compression reinforcement were
used for all beams and stirrups of 6mm ø bars at a spacing of
50mm c/c up to 150 mm from face of joint and 150mm c/c
for middle portion of 300mm and then spacing of 50mm c/c
for the remaining length were used .The thickness of the
slab was 40 mm.
Fig. 6 Reinforcement Details of Beam-Column Joint
Specimen as per the code IS 13920:1993.
The reinforced concrete Beam-Column joint with slab and
Beam-Column joint without slab specimens were cast and
cured for 28 days. The specimens were placed in the
reaction frame and tested under cyclic loading in the
structural laboratory. The column ends were provided by
pinned connections. On one end of the column, an axial load
of 50 kN was applied by using a hydraulic jack of 500 kN
capacity. Cyclic load was applied at the free end of all the
beams by using a hydraulic jack through load cell. Linear
Variable Differential Transducers (LVDTs) were placed on
the extreme edge of the all beams to show the deflection that
occurred at the point of application of load on the beam. The
following Fig. 7 and Fig. 8 show the details of the BCJ and
BCJS specimens respectively.

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Fig. 7 Beam-Column joint with slab (BCJS) specimen
Fig. 8 Beam-Column joint with slab (BCJS) specimen
Tests were carried out for the Beam – Column Joint without
slab specimen and Beam – Column Joint with slab specimen
and the results were observed at each end of the beam using
LVDTs placed at the top of the beam.
6. RESULTS AND DISCUSSIONS
6.1 Load Vs Deflection
Maximum load and corresponding deflection for each cycle
in all the four beams of beam – column joint without slab
(BCJ) and beam – column joint with slab (BCJS) specimens
are given in Table 9 and Table 10. The maximum Load
carrying capacity of BCJ was 20 kN but in BCJS it was 55
kN. Load Vs No.of cycle is also shown in Fig.9 for BCJ and
Fig. 14 for BCJS specimen. The deflection of BCJ was
maximum in 4th
cycle at but it was maximum only at 11th
cycle in BCJS. It indicated that the Beam Column Joint with
Slab (BCJS) showed better results in Load carrying capacity
and in resisting the defection than the Beam Column without
Slab (BCJ). Load Vs Deflection curve of all the Beams of
BCJ are shown in Fig. 10 to 13 and Load Vs Deflection
curve of all the Beams of BCJS are shown in Fig. 15 to 18.
Table 9 Load Carrying of Beam-column Joint without Slab (BCJ) for each cycle
Cycle Max. Load
In each cycle (kN)
Deflection (mm)
North Beam South Beam East Beam West Beam
1st
Cycle 5 3.2 3.4 2.8 3.0
2nd
Cycle 10 8.2 10.5 7.6 9.8
3rd
Cycle 15 12.3 13.2 12.5 12.9
4th
Cycle 20 21.2 22.8 21.0 21.5

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Fig. 9 Load VS No. of Cycle for BCJ
Fig. 10 Load vs. Deflection Curve for North Beam
Fig. 11 Load vs. Deflection Curve for South Beam
0
5
10
15
20
25
0 1 2 3 4 5
LoadinkN
No of Cycle
Load Vs No of Cycle
0
5
10
15
20
25
0 5 10 15 20 25
LoadinkN
Deflection in mm
Load vs Deflection curve for North beam
0
5
10
15
20
25
0 5 10 15 20 25
LoadinkN
Deflection in mm
Load vs Deflection curve for South beam

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Fig. 12 Load vs. Deflection Curve for East Beam
Fig. 13 Load vs. Deflection Curve for West Beam
Table 10 Load Carrying Capacities of Beam- Column Joint With Slab (BCJS) for Each Cycle
0
5
10
15
20
25
0 5 10 15 20 25
LoadinkN
Deflection in mm
Load vs Deflection curve for East beam
0
5
10
15
20
25
0 5 10 15 20 25
LoadinkN
Deflection in mm
Load vs Deflection curve for West beam
Cycle Max. Load
In each cycle (kN)
Deflection (mm)
North Beam South Beam East Beam West Beam
1st
Cycle 5 2.2 2.4 2.3 2.0
2nd
Cycle 10 5.2 5.6 5.0 5.2
3rd
Cycle 15 8.5 8.4 8.0 7.8
4th
Cycle 20 15.6 15.3 15.4 15.0
5th
Cycle 25 18.9 18.3 18.6 18.0
6th
Cycle 30 22.8 22.4 22.6 22.2
7th
Cycle 35 26.5 26.3 25.8 25.8
8th
Cycle 40 29.8 29.6 29.2 29.0
9th
Cycle 45 32.5 32.3 31.9 31.8
10th
Cycle 50 36.8 36.4 35.8 35.6
11th
Cycle 55 40.2 39.8 38.2 38.5

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Fig. 14 Load Vs No of Cycle for BCJS
Fig. 15 Load vs. Deflection curve for North Beam
Fig. 16 Load vs. Deflection curve for South Beam
0
10
20
30
40
50
60
0 1 2 3 4 5 6 7 8 9 10 11 12 13
LoadinkN
No of Cycles
Load vs No of cycles
-10
0
10
20
30
40
50
60
0 10 20 30 40 50
LoadinkN
Deflection in mm
Load vs Deflection curve for North beam
0
10
20
30
40
50
60
0 10 20 30 40 50
LoadinkN
Deflection in mm
Load vs Deflection curve for South beam

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Fig. 17 Load vs. Deflection curve for East Beam
Fig. 18 Load vs. Deflection curve for West Beam
6.2 Energy Dissipation
6.2.1 Energy Dissipation Capacity of BCJ
The energy dissipation capacity was calculated using the
enclosed area of the load deformation curve. Here the test
result of beam which was in north direction is chosen for
discussion. The energy dissipation of North Beam is shown
in Fig. 19.
Fig. 19 Energy Dissipation Capacity for North Beam of BCJ
0
10
20
30
40
50
60
0 10 20 30 40 50
LoadinkN
Deflection in mm
Load vs Deflection curve for East beam
0
10
20
30
40
50
60
0 10 20 30 40 50
LoadinkN
Deflection in mm
Load vs Deflection curve for West beam
0
20
40
60
80
100
120
140
1 2 3 4 5
CumulativeEnergydissipation
inkNmm
No of cycle
Energy dissipation curve for North beam

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6.2.2 Energy Dissipation Capacity of BCJS
The energy dissipation capacity was calculated using the
enclosed area of the load deformation curve. The energy
dissipation of North Beam is shown in Fig. 20.
Fig. 20 Energy dissipation capacity for North beam of BCJS
6.3 Crack Patterns
In the beam-column joint without slab specimen(BCJ) , the
cracks developed in the compression and tension side of
beam during loading and the bond between concrete and
reinforcement were reduced consequently. The first crack
occurred near the beam-column junction at 10 kN and
further increase in loading, made the cracks propagated and
the initial cracks started widening. Ultimate crack developed
at beam column joint at 20kN load. Spalling of concrete is
also occurred.Crack pattern is shown in the Fig. 21.
Fig. 21 Crack pattern of Beam-Column joint (BCJ)
specimen
In Beam – Column joint with slab specimen(BCJS) , the
initial cracks were observed at 20 KN on the surface of the
slab on further loading this crack was propagated and found
running towards beam. Ultimate crack developed at beam
column joint at 55 kN load. The deflected shape of the BCJS
specimen is given in the Fig. 22.
Fig. 22 Crack pattern of Beam-Column joint (BCJ)
specimen
6.4 Ductility Factor
Ductility is an important characteristic of any structural
element. It was described as the capacity of a structural
element to undergo deformation beyond yield without losing
much of its strength. Ductility has generally been measured
by a ratio called ductility factor. It is usually expressed as a
ratio of deflection (∆) at ultimate stage to the corresponding
property at yield as shown below
Displacement ductility factor µ∆ = ∆u / ∆y
Where ∆u – Ultimate displacement and ∆y – Yield
displacement
From the experiment it was observed that the Ductility
factor of BCJS specimen is more when compared to BCJ
specimen. The values of displacement ductility factors for
BCJ and BCJS are listed in Table 11 and Table 12
Table 11 Ductility Factor of Beam Column Joint Without
Slab (BCJ)
Sl.No Beam
Direction
Deflection (mm)
At
Yield
∆y
At
Ultimate
∆u
Ductility
Factor
µ∆=( ∆u/∆y)
1 North 8.2 21.2 2.58
2 South 10.5 22.8 2.17
3 East 7.6 21.0 2.76
4 West 9.8 21.5 2.19
0
100
200
300
400
500
1 2 3 4 5 6 7 8 9 10 11 12
CumulativeEnergydissipationin
kNmm
No of cycle
Energy dissipation curve for North beam

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Table 12 Ductility Factor of Beam Column Joint With Slab
(BCJS)
Sl.No Beam
Direction
Deflection (mm)
At
Yield
∆y
At
Ultimate
∆u
Ductility
Factor
µ∆=( ∆u/∆y)
1 North 8.5 40.2 4.37
2 South 8.4 39.8 4.74
3 East 8.0 38.2 4.78
4 West 7.8 38.5 4.94
7. SUMMARY
An experimental investigation was carried out on BCJ and
BCJS specimen under cyclic loading. The Results of the
experimental study on BCJ specimen and BCJS specimen
were analyzed and compared to reach the concluding points.
In BCJS specimen, it is obviously noticeable that the yield
load carrying capacity was 2 times more than that of the
BCJ specimen and also the ultimate load carrying capacity
was 2.75 times more than that of the BCJ specimen. It is
also clear that in the BCJS specimen, the energy dissipation
capacity of North beam were observed as 3.85 times more
than that of the BCJ specimen.
Noticing the crack pattern in the BCJS and BCJ, a
significant difference was observed. In BCJS first crack was
observed at the top of slab and it propagated towards the
beam, but in BCJ specimen first crack was observed at
Beam – Column joint itself and it widened for further
loading. On finding the different facts of the ductility factor
of North beam in BCJS was increased by 1.83 times than
that of BCJ specimen.
8. CONCLUSIONS
Referring the existing pattern, Indian standard for
earthquake resistant design of structures IS 1893 and Indian
standard for ductile detailing of reinforced concrete
structures IS 13920 do not have any provisions for Beam
Column Joint with Slab. So it is hereby recommended that
the strength of slab plays an important role in beam column
joint and it should be considered and the corresponding
details have to be included in these Indian standards.
REFERENCES
[1] Hikmat E.Zerbe and Ahmad J.durrani , 1990,
“Seismic Response of Connections in two-bay R / C
Frame subassemblies ” Journal of structural
engineering, vol.115, No.11, Pg. 2829-2843.
[2] Gilson N.Guimaraes et al, 1992, “Evaluation of
Joint-Shear Provisions for Interior Beam-Column
Slab Connections Using High-Strength Materials”,
ACI structural journal, Vol. 89,No.1.,Pg. 89-98.
[3] Devados Menon et al, 2007, ”Design of RC Beam
Column Joints Under Seismic Loading – A Review”.
Journal of structural engineering 2007, Vol. 33, Pg.
449-457.
[4] Burcu B.Canbolat and James K.Wight, 2008,
“Experimental Investigation on Seismic Behaviour of
Eccentric Reinforced concrete Beam-Column-Slab
Connections”, ACI structural journal , Vol 105, No.2,
Pg. 154-162
[5] K.R.Bindu and K.P.Jaya, 2008, “Performance of
Exterior Beam Column Joints With Cross - Inclined
Bars Under Seismic Type Loading”, Journal of
Engineering and Applied Science, 2008 ,Vol 7, Pg.
591-597.
[6] IS:13920-1993, 1993, “Indian Standard code of
practice for ductile detailing of concrete structures
subjected to seismic forces”, Bureau of Indian
Standards, New Delhi.
[7] P.C. varghese, 2006, “Advanced reinforced concrete
design”, Prentice hall of India private limited .

Flexural behaviour of interior r.c.beam column joint with and without slab under cyclic loading

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Flexural behaviour of interior r.c.beam column joint with and without slab under cyclic loading