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multi-stored buildings PDF

Added on - 25 Jan 2022

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ABSTRACT
In India, multi-stored buildings are usually constructed due to high cost and scarcity
of land. In order to utilize maximum land area, building and architects generally
propose asymmetrically plan configurations. These unsymmetrical plan buildings,
which are constructed in seismic prone areas, are likely to experience more damage
during earthquake. Earthquake is a natural phenomenon which can generate the most
destructive forces on structures. In the present study, four different models with
symmetric circular and rectangularplan constructed on soft rocky soil in seismic
zone V of India (as per IS: 1893-2016) are considered. Linear andstatic analysis
using the software in STAAD PRO is carried out for all the plan. The objective of the
present study is to study the behavior and comparison of building frames under strong
column and weak beam & strong beam and weak column. It is observed that the
building with circular symmetric plan with strong column and weak beam performs
well compared to the other building plan. It is recommended that construction of
rectangular symmetric building with strong beam and weak column should be avoided
in earthquake prone regions.
1
LIST OF SYMBOLS
ADesign horizontal seismic coefficient
DLDead load
EModulus of elasticity
EQEarthquake load along x direction
EQEarthquake load along y direction
hHeight of the structure
hHeight measure from the base of the building to floor i
LLLive load
nNumber of stores in the building
QLateral force at floor i
RResponse reduction factor
Sa/gAverage response acceleration coefficient for rock or soil sites based on
Appropriate natural periods and damping of the structure
VDesign seismic base shear
TApproximate fundamental period of vibration of the structure
WSeismic weight of the structure
WSeismic weight of floor i
ZZone factor
2
List of table
Table No.TopicPage No.
4.1Specification of the building25
5.1bending moment of circular building strong beam36
5.2bending moment of circular building strong column36
5.3bending moment ofrectangular building strong beam37
5.4bending moment ofrectangular building strong column37
5.5shear force of rectangular building strong beam38
5.6shear force of rectangular building strong column38
5.7shear force of circular building strong beam39
5.8shear force of circular building strong column39
3
List of figure
Serial no.TitlePage no.
Figure 4.4(a)Circular building plan19
Figure 4.4(b)Rectangular building plan19
Figure 4.4(c)Front view of circular
building plan
20
Figure 4.4(d)Front view of rectangular
building plan
20
Figure 4.4(e)whole plan of the circular
building
21
Figure 4.4(f)whole plan of the
rectangular building
21
Figure 4.4(g)3D circular building plan
of weak column and
strong beam section
22
Figure 4.4(h)3D rectangular building
plan of weak column and
strong beam section
22
Figure 4.4(i)3D rectangular building
plan of strong column and
weak beam section
23
Figure 4.4(j)3D circular building plan
of strong column and
weak beam section
23
Figure 4.5(a)Difference in deflection of
slab and beam adjacent
25
Figure 4.5(b)Discretization of beam25
Figure 4.6.3Distribution of lateral
forces at different levels at
which themassesare
located.
28
Figure 5.1.1(a)plate load under all
loading in circular
building plan with strong
column and weak beam
Front side
39
Figure 5.1.1(b)plate load under all
loading in circular
building plan with strong
column and weak beam
back side
39
Figure 5.1.2(a)plate load under all
loading in circular
building plan with weak
39
4
column and strong beam
Front side
Figure 5.1.2(b)plate load under all
loading in circular
building plan with weak
column and strong beam
back side
39
Figure 5.1.3(a)plate load under all
loading in rectangular
building plan with strong
column and weak beam
Front side
40
Figure 5.1.3(b)plate load under all
loading in rectangular
building plan with strong
column and weak beam
back side
40
Figure 5.1.4(a)plate load under all
loading in rectangular
building plan with weak
column and strong beam
Front side
41
Figure 5.1.4(b)plate load under all
loading in rectangular
building plan with weak
column and strong beam
back side
41
5
Contents
Chapter No.TopicPage No.
iList of figures
iiList of tables
iiiList of symbols
ivAbstract
1Introduction7
1.1General8
1.2Architectural behaviour of building9
1.3StaadPRO10
2Objective12-13
3Literature review14-18
4Methodology19
4.1Introduction20
4.2Purpose20
4.3Models of building20
4.4Description of building model21-26
4.5Slab and structural wall modelling27
4.6Loading28-30
4.7Load combination30
4.8Analysis method of structures31-34
5Results35
5.1Linear static analysis36-42
6Scope of future study43-44
7Conclusion45-46
8reference47-48
6
Chapter 1
Introduction
7
Introduction
1.1General
An earthquake also known as quake or tremor is the result of a sudden release of
energy in the earth’s crust that creates seismic waves. The most important cause from
an engineering point of view, it is believed at present, is the movement of faults which
are buried deep below the earth surface.
Earthquake has always been a thread to human civilization from the day of its
existence, devastating human lives, properly and manmade structures. The very recent
earthquake that we faced in our neighbouring country Nepal has again shown nature’s
fury, causing such a massive destruction to the country and its people. It is such an
unpredictable calamity that it is very necessary for survival to ensure the strength to
the structures against seismic forces. Therefore, there is a continuous research work
goingonaroundtheworld,resolvingarounddevelopmentofnewandbetter
techniques to resist the damages during seismic against failures under seismic forces it
is a prerequisite.
Earthquake cause ground to vibrate and these results a lateral forces on the surface.
Earthquakes don’t kill people but poorly built buildings do. Poorly built buildings
include poor quality of materials used poor shape of the buildings and poor design
without considering the codal provisions. Several countries including India have
experienced severe losses in the past, in terms of human casualty and property; most
recent are the bhuj earthquake of 26thJanuary, 2001; Sumatra earthquake of 26th
December, 2004 leading to tsunami and Kashmir earthquake of 8thOctober, 2005.
Most of the casualties were due to collapse of poorly constructed buildings in the
seismically vulnerable regions.
Earthquake caused random ground motions, in all possible direction emanating from
theepicentre.Verticalgroundmotionsarerare,butanearthquakeisalways
accompaniedwithhorizontalgroundshaking.Thegroundvibrationcausesthe
structures resisting on the ground to vibrate, developing inertial forces in the structure.
As the earthquake changes directions, it can cause reversal of stresses in the stresses
in the structural components that is tension may change to compression and
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