RCC DESIGN PRESENTATION FOR G+11

1. 1

2. “SEISMIC ANALYSIS OF G+11 STOREY C-SHAPE BUILDING
PROVIDED WITH AAC BLOCKS USING RESPONSE SPECTRUM
METHOD BY ETABS.”
Dissertation work by
Mr. RAKESH KARN
USN:18MTRSE005
Department of Civil Engineering
Faculty of Engineering and Technology
JAIN (Deemed-to-be University)
Under the guidance of
Prof. Manu S E
Assistant Professor
Department of Civil Engineering
Faculty of Engineering and Technology
JAIN (Deemed-to-be University)

3. CONTENT
1. Introduction
2. Review
3. Problem Identification
4. Problem Statement
5. Objectives
6. Materials & Methodology
7. Result and Discussion
8. Conclusion
9. Future scope
10. References
3

4. 1. INTRODUCTION
 To make structure safe and economical, structural
analysis should be carried for high rise buildings.
 Seismic analysis is mandatory to determine the
seismic forces.
 There are two parts of analysis those are static
analysis and dynamic analysis. Others sub analysis
are listed below in the flow diagram.
4

5. 5
Contd..,
SEISMIC
ANALYSIS
STATIC
ANALYSIS
LINEAR NON-
LINEAR
DYNAMIC
ANALYSIS
LINEAR NON-
LINEAR
1.Equivalent static
method
or lateral force method
or seismic coefficient
method
2. Displacement method
3. Energy based method
4. Capacity based
method
Push over
method
•Response spectrum
method/ mode
•Linear time history
method
Non- linear
time history
method
Fig: 1.1 Methods of analysis

6. Description of project
Building type RC Building
Location Patna
Structure type SMRF
Plinth area 2240 m2
Number of stories G+11
Floor to floor height 3.25m
Type of slab Two-way slab
Beam 350 mm x 450mm
Column 450 mm x 610 mm
Type of stair case Dogleg stair case
Type of lift Multi cell wall
Method of analysis Dynamic analysis
Concept of Design Limit State Design
6

7. 7
Grade of Reinforcement Fe415
Grade of Concrete M25 for Column
M20 for Beam, Slab
Calculation of DL As per Is 875-1987 part I
Calculation of LL As per Is 875-1987 part II
Calculation of WL As per Is 875-1987 part III
Calculation of seismic load As per Is 1893-2002 part I
Preliminary Design of
member
As per IS 456-2000
Soil type Medium
Bearing capacity 120 KN / m2
Contd..,

8. 2.RIVIEW OF LITERATURE
8
Sl. No. Author Title Work done
1 Hasselblad A
E et.al(2013)
Seismic analysis of RC
building and investigating the
performance of the building if
it is exposed to the seismic
load by response spectrum
method.
BY: STAAD Pro.
• Seismic load and static load
are taken in consideration.
• It result that to resist large
displacement large dimension
should be required.
• Drift were two to three time
more than allowed load for
seismic load and static load
.
2 Patil.
A.S.(2013)
Non-linear dynamic analysis
of ten storied RCC Building
considering various seismic
intensity and seismic
response.
By: (SAP 2000-15)
Variation occurrence of the
pattern in the seismic response
in story displacement and base
shear , concluded time history is
feasible to use for seismic
analysis provide safe design of
building.

9. 9
Sl. No. Author Title Work done
3
Mindaye
et.al(2016)
Seismic responses
analysis of G+10
RCC building with
the help of response
spectrum method and
linear analysis
approaches of
equivalent static
lateral force using .
Various response such as
overturning moment , lateral
force, displacement, base shear
was plotted, so as to compare
the obtained result of the
dynamic and static analysis.
Building might become
uneconomical because of high
value of force and other
moment. So, response spectrum
method consideration is
necessary.

10.  It was found during survey and research that the
building during earthquake it get failure of member
of frames or may get collapse of building.
 It is also found that building were uneconomical
design which was analyzed by static analysis method
or other improper methods for high rise building.
3. PROBLEM IDENTIFICATION
10

11.  The failure of building can be minimised during
earthquake effect or during lateral load.
 The building will be economically designed as the
wall provided is of AAC (Aerated Autoclave
Concrete Blocks) Block which is light in weight
makes load less up to 3 time less than normal brick,
ultimately the percentage of steel can be minimized
makes economical building.
4. PROBLEM STATEMENT
11

12. 5. OBJECTIVES OF THE RESEARCH WORK
12
1. Structural analysis of
building by ETABS 2016
by response spectrum
method.
2. Analysis and designing
of building economically
according to different
code.

13. 13
3. Study the effect of
earthquake load that’s
lateral load, wind load
on building by response
spectrum method.
Contd..,

14. 6. MATERIALS AND METHODOLOGY
14
Etabs
Etabs is a software here it was used for analysis
design based on Indian standard codes IS 1893:2002 part I for
Earthquake load or lateral load, IS 875: 1987 part I for dead
load, IS 875:1987 part II for live load and IS 875:1987 part III
for wind load calculation. For different geometry of building
and also by different methods of analysis.

15. 6.1 ACC BLOCK
 Autoclaved Aerated Concrete (AAC) block is made with fine aggregates,
cement, and an expansion agent that causes the fresh mixture to rise like
bread dough.
 In fact, this type of concrete contains 80 percent air. In the factory where it
is made, the material is moulded and cut into precisely dimensioned units.
 Cured blocks or panels of autoclaved aerated concrete are joined with thin
bed mortar.
 Components can be used for walls, floors, and roofs.
 The lightweight material offers excellent sound and thermal insulation, and
like all cement-based materials, is strong and fire resistant.
 In order to be durable, AAC requires some type of applied finish, such as a
polymer-modified stucco, natural or manufactured stone, or siding.
15

16. 6.2 Response Spectrum Analysis Method
16
1. Response spectrum
analysis of building can be
applied for seismic analysis.
2. Maximum displacement
and member force gives
average of many
earthquake motion.

17. METHODOLOGY
17
Mater
ial
Defini
ng
Preli
minar
y
desig
n of
sectio
n
Sectio
n
defini
ng as
per
preli
minar
y
deign
Defini
ng
load
patter
n
Defini
ng
Respo
nse
spectr
um
functi
on
Defin
ing
RS in
Load
cases
Defini
ng
Load
combi
nation
Defini
ng
mass
sourc
e
Defini
ng
Diaph
ragm
Defini
ng
Diaphr
agm
Check
model
Analy
ze
Mode
l/ Run
model
Desig
n
model
Detail
ing
the
model
Flow diagram of the defining, modeling, analyzing, Designing
and detailing of building

18. Model of Building
18
Fig. 6.1: Plan of the Building

19. Model of Building
19
Fig. 6.2: Isometric view of the model

20. 20
Fig. 6.3: Plan showing the assigning of dead load both on
internal and external beam of AAC block wall

21. 21
Fig. 6.4: Assign live load on floor

22. 22
Fig. 6.5: Load pattern defined

23. 23
Fig. 6.6: Load Cases for Response Spectrum

24. Load combination
24
1. 1.2 {DL + IL ± [ELx ± 0.3 ELy ± 0.3 ELz]} and
2. {DL + IL ± [ELy ± 0.3 ELx ± 0.3 ELz]};
3. 1.5 {DL + IL ± [ELx ± 0.3 ELy ± 0.3 ELz]} and
4. 1.5 {DL + IL ± [ELy ± 0.3 ELx ± 0.3 ELz]}
5. 0.9 DL± 1.5 [ ELx± 0.3 ELy± 0.3 ELz] and
6. 0.9 DL± 1.5 [ ELy± 0.3 ELx± 0.3 ELz]
 Load combination as per IS 1893:2016 (part I). For Earthquake
load along X axis , Y-axis and z- axis but here it is sufficient to
provide X, Y –axis .

25. 7. RESULT AND DISCUSSION
After analysis of building of C-shape, following result we
obtained:
7.1 Story Displacement
Maximum displacement is 25.95 mm with respect to base zero
mm.
25
Fig. 7.1: Maximum story
Displacement, displacement vs
story

26. 7.2 Story Shear
26
Maximum story shear force is 3.13872KN.

27. 7.3 Overturning effect
Here maximum story overturning moment is 75.98047 KN-m on
base and minimum 0 KN-m at story 12.
27
Fig. 7.3: Overturning moment at different stories

28. 7.4 Story drift
Story drift is 0.0002.
28
Fig7.4: story Drift

29. 29
Fig. 7.5: Story stiffness
7.5 Story Stiffness
Story stiffness 1246442 KN/m at story 4 and minimum at base.

30. 30
Fig. 7.6.1: Shear force and Bending moment of Beam B78
7.6 Shear force and bending moment
Maximum Minimum
Shear force 53.4365 KN 38.3581 KN
Bending moment 31.8818 KN-m -57.1038 KN-m
Beam

31. 31
Fig. 7.6.2: Shear force and Bending moment of column C3
Contd..,
Maximum Minimum
Shear force 38.5836 KN 27.4674 KN
Bending moment -76.9088 KN-m -108.0340 KN-m
Column

32. 32
Fig. 7.6.3: Shear force and bending
moment Elevation view
Fig. 7.6.4: Shear force and bending
moment Plan view

33. 33
Contd..,
The lateral force is maximum along x- axis1039.338757 KN at
story 12 and minimum at base is zero.
Fig7.6.5: Lateral force on building along X- Direction.

34. 34
Fig. 7.6.6: Lateral force on building along Y- Direction.
The lateral force is maximum along Y- axis1018.722225 KN at
story 12 and minimum at base is zero.
Contd..,

35. Contd..,
35
Here, result we found 3.76 % of steel at base Column
and decreasing as story increases up to 0.8 %. Similar for Beam
up to 1.5% of steel is used for base and decreasing as the story
is increasing
Fig. 7.6.7: showing Percentage of steel

36. 8. CONCLUSION
AAC block is used here for wall system in irregular building which
also gives less percentage of steel due to its light weight, the
displacement, story shear and story drift are minimum to make
economical design of building under the influence of seismic load as
well wind load.
In presence of infill wall, it can affect the seismic behaviour of frame
structure to large extent and the infill wall increases the strength and
stiffness of the structure. Providing the infill wall reduces the
displacement due to earthquake.
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37. 9. FUTURE SCOPE
In this present study irregular C-shaped structure is considered
and further study can be carried out for irregular H, Y and U
shaped structures.
In this study linear Time history analysis is selected by using
Bhuj earthquake data further study can be carried out for static
non-linear analysis (push over analysis), non-linear Time history
analysis and response spectrum analysis using different
earthquake data (Elcentro-1940, Northridge, Kobe-1995 etc..,).
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38. 10. REFERENCES
 “Comparative Study of Equivalent Lateral Force Method and Response
Spectrum Method for OMRF Multistory Building–A Review Paper”, Kumar
N, Kushwaha d, Maurya M c & Sharma R K (2018).
 “Dynamic Analysis of multistoried regular building”, Sharma M & Maru D S
(2014). IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-
ISSN, 2278-1684.
 “Seismic analysis of a reinforced concrete building by response spectrum
method”, Hassaballa A E, Adam, F M & Ismaeil, M. A. (2013).
 “Time history analysis of multistoried RCC buildings for different seismic
intensities”, Patil A S & Kumbhar P D (2013), International Journal of
Structural and Civil Engineering Research, 2(3), 194-201.
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