IJSRD - International Journal for Scientific Research & Development| Vol. 7, Issue 06, 2019 | ISSN (online): 2321-0613
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Seismic Performance of RC Multi-storey Building Resting on Sloping
Ground
Parvez Alam Tikotikar1 Saddam Hussain Masali2 2Assistant Professor
1,2Department of Civil Engineering 1,2Secab Institute of Technology, Vijayapura, Karnataka, India
Abstract— The buildings on sloping ground different from
other buildings. The buildings in hilly areas have to be
configured differently, resulting in adoption of either a Step
back building or a Step back set back building. The various
floors of such buildings step backs towards hill slope and at
the same time buildings may have setbacks also. These
buildings are very irregular, resulting in varying column
heights. In the present study, Equivalent Static Analysis and
Response Spectrum analysis as per IS: 1893 (part 1): 2002
have been conducted on hill slope buildings with varying
number of bays across slope direction and having varying
slope angles with the horizontal using ETABS 9.7.4 software.
The results were obtained in the form of Time Period, top
storey displacement, base shear, storey drift and shear force
induced in columns. It is observed that the short columns on
uphill side attracts maximum shear force, are the worst
affected during seismic excitation and Step back building
could prove more vulnerable than other configuration of
building.
Keywords: ETABS Software, E.S.M., RC Multi-Storey
Building
I. INTRODUCTION
The shortage of plain ground in bumpy regions forces
development movement on inclining ground bringing about
different significant structures, for example, strengthened
cement encircled medical clinics, universities, lodgings and
workplaces laying on uneven slants. In certain pieces of
world, uneven region is progressively inclined to seismic
movement; for example upper east area of India. In this
uneven areas, generally material like, the adobe, brunt block,
stone workmanship and dressed stone brick work, timber
fortified solid, bamboo, and so forth, which is locally
accessible, is utilized for the development of houses. In this
way, there is well known and squeezing interest for the
development of multi storey structures on slope incline in and
around the urban communities. The structures built on
slanting ground results in sporadic auxiliary setup having
establishments at various dimensions. Such structures present
unique auxiliary and constructional issues. Dynamic
attributes of slope structures are altogether not quite the same
as the structures laying on level geology, At the point exposed
to horizontal loads, the structures are for the most part
exposed to noteworthy torsional reaction. Further, because of
site conditions, structures on slope incline are described by
unequal segment statures inside a story, which results in
extreme variety in solidness of sections of a similar story. The
short, firm segments on tough side draw in a lot higher
sidelong powers and are inclined to harm. The present
investigation is a push to recognize the seismic conduct of
structures laying on changing inclines with the fluctuating
story level by performing Equivalent static examination and
Response investigation. Displaying and Analysis of
structures laying on inclining ground is finished range
utilizing ETABS programming bundle.
II. METHODOLOGY
In the present investigation, two structure designs are
considered, which incorporate advance back structures
signified as STEP and venture back set back structures meant
as STEPSET arranged on inclining ground. Number of story
considered for each kind of setups is 10, 12 and 14 story. Plan
format of every design incorporates, 3 narrows and 4 straights
over the incline bearing were 6 bayous are with considered
all long slant heading, which will kept constant for equal all
arrangements of structure outline. Slants of ground, considers
were 20 degree, 30 degree & 40 degree with present their
level. Absolutely 36 RC structures have been considered with
the setups referenced above, by considering 12 building
casings on each Slope point. The sections are adopt to have
square to keep away from the problems as direction.
A. Objective of the Study
1) To study the seismic performance of buildings resting on
varying slopes.
2) To study the seismic performance of buildings resting on
varying slopes with varying storey level and varying
number of bays across slope.
3) To perform Static analysis and Response spectrum
analysis of Hill buildings using ETABS software.
B. Description of Building Structure
The details of building I given in below table 1
STRUCTURE DESCRIPTION
No of Stories G+9,G+11,G+13
Height of one storey 3.5 m
Height of Base Storey 4.80 m
Soil Type Medium Soil
Seismic Zone IV
Importance Factor 1
Grade of Concrete M30 (Column)
M25 (Beam and Slab)
Grade of Steel Fe 415
Size of The Beam 300mmX400mm
Size of the Column 500mmX500mm
Slab Thickness 150 mm
Live Load 3 KN/m
Live Load on Roof 2.5 KN/m
Floor Finish 1 KN/m
III. MODELING AND ANALYSIS
ETABS is a complex, still easy to use, unusual reason
investigation the setup program was expanded and explicitly
for structure frameworks. (ETABS) Version 9 includes an
Seismic Performance of RC Multi-storey Building Resting on Sloping Ground
(IJSRD/Vol. 7/Issue 06/2019/096)
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instinctive and ground-breaking Unparalleled graphical
interface demonstrating, diagnostic, and planning systems,
Coordinated use of a typical database. Yet the situation
remains unchanged. speedy and easy to do. Straight forward
structures, The largest and most complicated ETABS can also
cope with structure models, including a wide scope the
instrument for decisions concerning non-linear practices
auxiliary designers in there structure business.
Fig. 1: Typical 2D and 3D Step back building model on 20°
slope
Fig. 2: Typical 2D and 3D Step back set back building
model on 20° slope
Fig. 3: Typical 2D and 3D Step back building model on 30°
slope
Fig. 4: Typical 2D and 3D Step back set back building
model on 30° slope
Fig. 5: Typical 2D and 3D Step back building model on 40°
slope
Fig. 6: Typical 2D and 3D Step back set back building
model on 40° slope
Seismic Performance of RC Multi-storey Building Resting on Sloping Ground
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IV. RESULTS
A. Top Storey Displacement Variation (E.S.M.)
Fig. 7: Variation of top storey displacement with respect to
hill slope for STP buildings
Fig. 8: Variation of top storey displacement with respect to
hill slope for STPSET buildings
B. Top Storey Displacement Variation (R.S.M.)
Fig. 9: Variation of top storey displacement with respect to
hill slope for STP buildings
Fig. 10: Variation of top storey displacement with respect to
hill slope for STPSET
C. Base Shear Variation (E.S.M.)
Fig. 11: Variation of base shear with respect to hill slope for
STP buildings
Fig. 12: Variation of base shear with respect to Hill slope for
STPSET buildings
D. Base Shear Variation (R.S.M.)
Fig. 13: Variation of base shear with respect to hill slope for
STP buildings
Seismic Performance of RC Multi-storey Building Resting on Sloping Ground
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Fig. 14: Variation of base shear with respect to Hill slope for
STPSET buildings
E. Storey Drift Variation(E.S.M.)
Fig. 15: Variation of storey drift with respect to hill slope
for STP buildings
Fig. 16: Variation of storey drift with respect to hill slope
for STPSET buildings
F. Storey Drift Variation(R.S.M.)
Fig. 17: Variation of storey drift with respect to hill slope
for STP buildings
Fig. 18: Variation of storey drift with respect to hill slope
for STPSET buildings
G. Shear Force in Short column
Fig. 19: Variation of shear force in columns of STP on 20⁰
Slope
Fig. 20: Variation of shear force in columns of STPSET on
20⁰ Slope (RSA)
Fig. 21: Variation of shear force in columns of STP on 30⁰
Slope (RSA)
Seismic Performance of RC Multi-storey Building Resting on Sloping Ground
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Fig. 22: Variation of shear force in columns of STP on 40⁰
Slope (RSA)
V. CONCLUSION
1) Time period and top storey displacement increases with
increase in number of story level. Base shear, storey drift
decreases with increase in number of story level.
2) Step back buildings produces higher value of time
period, top storey displacement and base shear than Step
back Set back building frames.
3) Step back set back buildings produces 45-56% higher
value of storey drift than Step back buildings.
4) As the number of bays increases across slope direction,
time period decreases, however, top storey displacement,
base shear, storey drift increases due higher stiffness.
5) As the Slope angle increases, time period, top storey
displacement decreases, which indicates that the stiffness
is increasing of the buildings with increase in hill slope.
6) As the Slope angle increases, Base shear, Storey drifts
increases.
7) In case of buildings resting on sloping ground, short
column on uphill side attracts maximum shear force in
the range of 39-319%, compared to adjacent long
columns, which are the worst affected due to seismic
excitation. Special attention should be given while
designing these columns.
8) Step back set back buildings may be favoured on sloping
ground, provided special attention is given to reduce
storey drift.
9) Buildings resting on higher angle are the critical
buildings, as they produce 58- 63% higher value of base
shear and 31-43% higher value of storey drift than the
buildings resting on lower slope angles.
10) Shear force induced in short column on uphill side of
buildings on 30⁰ hill slope is found to be 33-40% higher
compared to other slope angles due to higher stiffness of
the column.
VI. SCOPE OF THE STUDY
The study is carried out considering two types of building
configurations as Step back buildings and Step back set back
buildings situated on varying slopes with the horizontal and
which are located in seismic zone IV. Seismic performance is
studied by performing Equivalent static method and
Response spectrum method. The modeling and Analysis is
done using ETABS v 9.7.4 software package.
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