Parametric study of multi storied RCC flat slab structure under seismic effect having different plan aspect ratio and salenderness ratio

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A
PROGRESS REPORT
ON
“Parametric study of multi storied R.C.C flat slab structure under seismic
effect having different plan aspect ratio and slenderness ratio.”
This progress work is submitted in partial fulfillment of the requirements for the completion of
the project & dissertation work.
(Session 2015-2016)
. Submitted by .
Shubham S. Borkar
Sourabh kumar
. SUPERVISOR .
Prof. Sudhir kapgate
( Department of civil engineering)
DEPARTMENT OF CIVIL ENGINEERING
NAGPUR INSTITUTE OF TECHNOLOGY,NAGPUR

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CERTIFICATE
This is to certify that progress work of the project work entitled
“Parametric study of multi storied R.C.C flat slab structure under seismic
effect having different plan aspect ratio and slenderness ratio.”
. Submitted by .
Shubham Borkar
Sourabh kumar
This progress work , as a part and parcel of the entire project work, completed by Shubham
Borkar & Sourabh kumar under my supervision and submitted in partial fulfillment of the
requirement for the completion of the project work in the Academic Year 2015-2016
. Prof. Sudhir kapgate .
(Department of Civil Engineering, NIT)

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INDEX
CONTENT PAGE NO.
Certificate II
Abstract -
Chapter 1: Aim & Objective 4-5
Chapter 2: Introduction 6-7
Chapter 3: Assumptions 8-9
Chapter 4: Plan Aspect ratio 10
Chapter 5: Slenderness ratio 11
Chapter 6: Literature Survey 12-13
Chapter 7: Methodology 14
References 15

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AIM
"Parametric study of multi storied R.C.C. flat slab structure under seismic effect
having different plan aspect ratio and slenderness ratio."

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OBJECTIVES
 To calculate design lateral forces on multi-storied R.C.C. Flat slab structure with regular building
configuration in plan but different aspect ratio using “Response Spectrum Analysis.”
 To calculate and study the response of structure situated in seismic zone IV and their comparison.
 To determine limit aspect ratio and slenderness ratio for safe and stable structure.
 To perform analysis using ETABS for static and dynamic analysis.

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INTRODUCTION
Definition of flat slab :
Flat slab is a reinforced concrete
slab supported
By columns with or without drops
& column
Head.

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COMPONENTS OF FLAT SLABS
Drops: To resist the punching shear which is predominant at the contact of slab and column
support, the drop dimension should not be less than one -third of panel length in that direction.
Column heads: Certain amount of negative moment is transferred from the slab to the column at
the support. To resist this negative moment the area at the support needs to be increased .This is
facilitated by providing column capital/heads flat slab.
FLAT SLAB WITH DROP PANEL& COLUMN HEAD

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ASSUMPTIONS
 STRUCTURE Multi- Storied R.C.C. Flat slab Structure
NUMBER OF STOREY 11
 PLAN DIMENSIONS
• AREA 1200 m2
• COLUMN SPACING
 IN X DIRECTION 6m
 IN Y DIRECTION 6m
• FLOOR TO FLOOR HEIGHT 3.6m
• COLUMN SIZE (600 mm X 600 mm)
• SLAB THICKNESS 300 mm
• DROP THICHNESS 150mm
• DROP SIZE (1.25mX1.25m)
 LOADING
• DEAD LOAD As Per IS 875:1987 ( Part 1)
• LIVE LOAD As Per IS 875:1987 ( Part 2 )
• AT TYPICAL FLOOR 4.0 kN/m2
• FLOOR FINISH 1.0 kN/m2
 DATA FOR SEISMIC ANALYSIS
• EARTHQUAKE LOAD As Per IS 1893 (Part 1)-2002
• TYPE OF FOUNDATION Isolated Column Footing
• DEPTH OF FOUNDATION 3.5m
• TYPE OF SOIL Type II, Medium As Per IS 1893

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• BEARINGCAPACITY OF SOIL 200 kN/m2
• PERCENTAGE DAMPING 0.5%
• TYPE OF FRAME Special moment resisting Frame
 METHOD OF ANALYSIS RESPONSE SPECTRUM METHOD
 LOAD CASES

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PLAN ASPECT RATIO (L/B)
• AREA CONSTANT = 1200 M2
• TABLE MODEL GROUP FOR ASPECT RATIO (L:B)
MAIN
GROUP
ASPECT
RATIO
LENGTH WIDTH COLUMN
SPACING
L : B L (m) B(m) X(m) Z(m)
M1 1 35 35 6 6
M2 2 49 25 5.85 5.5
M3 3 60 20 5 6
M4 4 60 15 6 5
M5 5 90 18 6.25 6

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SLENDERNESS RATIO (H/B)
• Various slenderness ratio can be obtained by changing no. Of storey & keeping width of building
constant

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 TABLE MODELFOR SLENDERNESSRATIO (H:B)
SR.NO MODEL
GROUP
MODEL ASPECT
RATIO
NO. OF
STOREY
STOREY
HEIGHT
SLENDERNESS
RATIO(L:B) G + 3.60 (H:B)
1
M1
M11
1
3 14.40 0.41
M12 5 21.60 0.61
2
M13 7 28.80 0.82
3
M14 9 36.00 1.03
4
M15 11 43.20 1.23
5
6
M2
M21
2
3 14.40 0.57
7 M22 5 21.60 0.86
8 M23 7 28.80 1.15
9 M24 9 36.00 1.44
10 M25 11 43.20 1.73
11
M3
M31
3
3 14.40 0.72
12 M32 5 21.60 1.08
13 M33 7 28.80 1.44
14 M34 9 36.00 1.8
15 M35 11 43.20 2.16

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 TABLE MODELFOR SLENDERNESSRATIO (H:B)contd.
SR.NO
MODEL
GROUP
MODEL
ASPECT
RATIO
NO. OF
STOREY
STOREY
HEIGHT
SLENDERNES
S RATIO
(L:B) 3.60 (H:B)
16
M4
M41
4
3 14.40 0.96
17 M42 5 21.60 1.44
18 M43 7 28.80 1.92
19 M44 9 36.00 2.4
20 M45 11 43.20 2.88
21
M5
M51
5
3 14.40 0.8
22 M52 5 21.60 1.2
23 M53 7 28.80 1.6
24 M54 9 36.00 2
25 M55 11 43.20 2.4

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ANALYSIS OF 11 STOREYR.C. STRUCTURE
PLAN ASPECT RATIO (L/B)= 1
SLENDERNESS RATIO (H/B)= 0.96
ANALYSIS OF G+11 STOREYR.C. STRUCTURE
PLAN

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LITERATURE SURVEY
S.S. Patil, Rupali A. Sigi(2014) [1]“Flat Slab Construction in India”:
This paper deals with the different type of RCC flat slab structure and design of flat slab with the
help of IS 456:2000 and ACI-381(2) codes.
Conclusion:-
• Design of conventional R.C.C flat plate/slab in India, utilizing Indian codes,has many
shortcomings, which have to be addressed and revised soon.
• Conventional R.C.C structure should be the preferred choice for spans up to 10 meters.
• Until then indian engineers will continue to use indian codes in combination with other
standards like the aci, bs or euro code to design and analyze flat slabs/plates .
Rucha.S.Banginwar, M.R.Vyawahare, P.O.Modani, [2] “Effect of Plan Configurations
on the Seismic Behaviour of the structure By Response Spectrum Method”
• To evaluate the effect of plan configurations on the response of structure by
RSM(response spectrum method).
• The IS-1893 (Part I: 2002) guidelines and methodology are used to analyse the problem.
• Behaviour of different geometrical configurations of structure which are located in the
same area during earthquake by RSM.
• More emphasis is made on the plan configurations and its is analysis by RSM.
Conclusion:-
• Plan configurations of structure has significant impact on the seismic response of
structure in terms of displacement, story drift, story shear. The torsion and displacements
were obtained on higher side in some shapes in comparison to other.

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Prof. K S Sable, Er. V A Ghodechor, Prof. S B Kandekar, [3]“Comparative Study of
Seismic Behavior of Multistory Flat Slab and Conventional Reinforced Concrete
Framed Structures”
• Studied conventional R.C.C building and flat slab building for different floor height.
• The effect of seismic load has been studied for the two types of building with different
height.
• Observation includes behaviour of structure under effect of seismic loading in terms of
changes in natural time period, base shear,sway moments and column axial forces
Conclusion:-
• The natural time period increases as the height of building ( No. of stories) increases,
irrespective of type of building viz. conventional structure, flat slab structure and flat slab
with shear wall. However, the time period is same for flat slab structure and flat slab with
shear wall.
Mohit Sharma and Dr. Savita Maru (2014), [4]
“Dynamic Analysis of Multistoried Regular
Building”:
• Performed the seismic analysis on G+30 storied regular building using STAAD Pro
V8i.
• Performed analysis with both static and a dynamic method as per the parameters
mentioned in IS 1893 2002 part I.
• Compared between two methods of analysis on the basis of Axial Forces, Torsion
and Moment at different nodes and beam.
Conclusion:-
• Result obtained for Dynamic Analysis were higher that the values as obtained by
Static Analysis for the same points and conditions.

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METHODOLOGY
SR.NO SEMESTER ACTIVITY DURATION
1. VII Review of existing literature by different research 1 month
2. VII Study of is 1893:2002 and learning Software ETABS 3 month
3. VII Formulating the assumption stating the scope of
project by considering various parameter
1 month
4. VIII Modeling and analysis of the structure with the help
of software
1 month
5. VIII Comparison of the data obtained after analysis 2 month
6. VIII Understanding the results of analysis, formulating
Conclusion and further recommendation keeping
scope of study in mind
2 month
7. VIII Dissertation writing 1 month

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REFRENCES
• I.S. 456-2000, Indian standard code of practice for plain and reinforced concrete, bureau of indian
standard, new Delhi.
• Basics of Structural Dynamics & ASEISMIC Design by S.R Damodarasamy & S. Kavitha
• Paz. Mario. “Structural dynamics" theory and computation, CBS, publishers and distributors
dayaganj, new delhi.
• Bis-1893, criteria for earthquake resistant design of structures-part-1, general provisions and
buildings, bureau of indian standards, new delhi -2002.
• I.S-13920."Ductile detailing of reinforced structures subjected to seismic force" code of practice
bureau of indian standards, new delhi -1993.
• I.S 4326 – 1993, earthquake resistant design and construction of buildings - code of practice,
bureau of indian standard, new delhi
• SP-16-1980- design aids for reinforced concrete to is-456-1978-bureau of indian standards, new
delhi.
• IS-875-1987.".Indian standard code of practice for structural safety loadings standards Part-1, 2"
Bureau of Indian Standards, New Delhi.
Www.Nicee.Org, the national information centre of earthquake engineering(nicee - established 1999)
.

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THANK YOU