Mega Project 15 April
Mega Project 15 April
1. INTRODUCTION
In India, reinforced concrete structures are designed Reinforced concrete overhead water tanks
are widely used to provide the safe drinking water. Most water supply systems in developing
countries, such as India, where urbanizing is increasing day by day rely on overhead storage
tanks and hence there is need to construct a greater number of water tanks. Storage reservoirs
and overhead tanks are used to store water, liquid petroleum, petroleum products and similar
liquids. The common materials used for the development of tanks are concrete, steel and
masonry. RCC is commonly used in construction because it is supposed to be durable material
giving long maintenance free service.
Tanks resting on ground: The tanks resting on ground like clear water reservoirs,
aeration tanks, settling tanks, etc. are supported on ground directly. The wall of these tanks is
subjected to pressure and the base is subjected to weight of water. These tanks are rectangular
or circular in their shape.
Underground tanks: An Underground storage tank (UST) is a storage tank that is placed
below the ground level. Steel or aluminum tanks, made by manufacturers in many states and
conforming to standards set by the Steel Tank Institute. Underground water storage tanks are
used for underground storage of drinking water, wastewater and rainwater collection. So,
whether you call it a water tank or water cistern, Plastic underground water tanks (cistern) are
a great alternative to concrete cisterns.
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Elevated water tanks: Elevated water tanks of varied shapes are often used as service
reservoirs, as a balancing tank in water system schemes and for replenishing the tanks for
various purposes. Reinforced concrete water towers have distinct advantages as they're not
suffering from climatic changes, are leak proof, provide greater rigidity and are adoptable for
all shape.The tanks may be either open or roofed over and they may be either circular or
rectangle. Concrete used has to be watertight. The tanks resting on ground like clear water
reservoirs, settling tanks, aeration tanks etc. are supported on the ground directly. The walls of
these tanks are subjected to pressure and the base is subjected to weight of liquid and upward
soil pressure. The tanks may be covered on top. From design point of view, the tanks may be
classified as per their shape as following:
b) Circular tanks
c) Rectangular tanks
d) Square tanks
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Rectangular tanks are provided for smaller to moderate capacity. For small capacities, circular
tanks prove uneconomical as the formwork for circular tanks is very costly. The rectangular
tanks should be preferably square in plan from point of view of economy. It is desirable that
longer side should not be greater than twice the smaller side.
ESR is the major water distribution system in India. That is because the water is stored in the
container at a certain height above ground level and then distributed by gravity, which reduces
the pumping requirement for the area.
The classification of ESR is based mostly on the shape of the container, and the shapes can be
rectangular, cylindrical, or intz type, which is geometrically very efficient and safe to dissipate
the hydrostatic pressure.
The container to store the water, staging to support the container at the required height, and
foundation to transfer the load onto the soil are the three main components of an elevated water
tank, in which every element needs different analysis and design considerations suitable for
the functional requirement.
Elevated water tanks are examined as lifeline structures, and hence seismic safety is important
to consider. The failure of such a structure may lead to disruptions in the distribution of water
to the public and firefighting processes in the city. Severe damage was observed in a past
earthquake, such as the 1997 Jabalpur earthquake and the Bhuj earthquake in 2001 in India.
During the earthquake, the water in the lower part of the tank behaves as mass, which moves
with the wall and is known as impulsive mass, and the liquid mass in the upper portion of the
tank undergoes sloshing mass or convective mass.
Capacity repositories and above tank are utilized to store water, fluid oil, oil-based
commodities and comparable fluids. These designs are made of stone work, steel, built up
concrete and pre pushed concrete. Out of these, workmanship and steel tanks are utilized for
more modest limits. The expense of steel tanks is high and consequently they are seldom
utilized for water stockpiles. Supported substantial tank is high and subsequently they are
seldom.
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Aim:
Design & analysis of circular water tank with varied zones by STAD PRO Connect
Objective
• To make a study about the design of water tanks
• Design of circular overhead water tank by LSM method
• Preparing a water tanks design which is economical and safe, providing proper steel
reinforcement in concrete and studying its safety according to various codes.
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3. Review of literature
1. A.D.V.S. Uma Maheswari, et al 1 As we know from the past, several reinforced
concrete elevated water tanks were severely damaged or collapsed during earthquakes
all around the world. As a result of general findings, the collapse of the raised tank's
supporting system is more critical than the other structural sections of the tank.
2. M. Sai Ramya, et al 2 System's lifeline is its elevated water tanks, which are its most
significant structures. As a result of earthquakes, elevated water tanks have been
damaged and collapsed in the past. Lack of suitable support systems for the water tank
and incorrect staging are responsible for the damage.
4. Nitesh Singh, et al 4 Water tanks are designed to withstand dead load + live load, wind
load, and seismic loads, according to IS rules of procedure. Tanks are often planned
for wind forces and not even examined for earthquake loads, believing that they will
be safe under seismic forces after they are designed for wind forces. However, this is
not always the case. A water tank with an H-shaped inlet is studied for Indian
circumstances. Due to the fact that wind flows relative to the surface of the earth and
exerts loads on structures standing on the ground, the wind's effect on elevated
structures is quite important.
5. Prashant Bansode 5 Structures such as reinforced concrete elevated water tanks are
extremely valuable. During and after earthquakes, they are regarded to be essential
lifelines. Like an inverted pendulum, an elevated water tank is composed of an
enormous water mass perched on the topmost stage in its design. For the tank to fail
during an earthquake, this is the most important factor to keep in mind.
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7. Ranjit Singh Lodhi, et al 7 Every creation comes from the water. Water is essential
to daily living. As a home or industrial storage facility, the overhead liquid storage
tank is the most efficient. Water tanks can be classified as overhead, on ground, or
under, according on where they are located in the structure.
10. R.V.R. Prasad and Akshaya B. Kamdi (2012) Water is stored in above water tanks.
BIS published the new version of 3370 (parts 1&2) in 2009, after a long hiatus from
the 1965 original. This new code mostly applies to liquid storage tanks. The limit state
approach is employed in this revision. The LSM approach is the most costeffective
way to design a water tank since the amount of material required is less than using the
WSM method.
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4. Briefing of Project
DIMENSIONS OF TANK
Diameter of the cylindrical portion,
D=
Where , D = diameter
D=
D = 8.56
Say 9m
R = 6.52 m
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𝑊×𝑅 4×6.52
T1 = =
1+𝑐𝑜𝑠𝜃 1+0.724
T1 = 15.13 KN/m
𝟏𝟓.𝟏𝟑×𝟏𝟎𝟑
Meridional stress = 𝟏𝟎𝟎𝟎×𝟏𝟎𝟎 =0.151 N/
W = 10.95 KN/m
∴ Total hoop tension in beam
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𝐷 9
W × 2 = 10.95 × 2
= 49.275 KN
49.275×103
< 1.5
250×𝐷+(9.33−1)×753
Considering D = 300 mm
Is : 456-2000, pg-48
Sv = 0.87×𝑓𝑦×𝑎𝑠𝑣 0.4×𝑏 𝜗
= 362.96 mm
Spacing limits :
(b) 300mm
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𝑇 45×𝐻
Ast= 𝜎 = × 103
𝑠𝑡 130
➢ 175 = t
Provide t =175m
Distribution steel
H/3 = 4/3 = 1.23 m
𝐻 2
𝛾𝑤 ×𝐻×( )
Cantilever moment (m) = 3
=10.086KN.m
6
𝑀
Ast for moment =
𝜎𝑠𝑡 ×𝑗×𝑑
10.086×106
= 130×0.861×125
= 720.879 mm^2
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Design & Analysis of Circular ESR With Varied Zones
d = 163.3 mm
= 200−40 = 160 mm
Ast = =1424mm2
201×1000
Spacing of 16mm∅bars = = 141mm
1424
Providing 16mm∅bars@130mm/c
This is the radial steel at the radial steel at top and is provide 0.2 dia
= 0.2 × 9
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Design & Analysis of Circular ESR With Varied Zones
DESIGN OF COLUMN
8 columns
Height of column = 12 m
= 528.48 KN
Factored load = 1.5× P = 1.5 × 528.48 = 792.72 KN
Condition = column effectively held in position and restrained against rotation in both ends.
3400
= 0.13 > 0.05
300
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792.72×10^3=0.45×30×(70685.83-Asc) + 0.75×415Asc
DESIGN OF BRACING
Load calculation
Ast = 1350. 62 mm
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Assume 4 – 25 mm∅bar
reinforcement
𝑊𝐿2 10.875×42
Vu = = = 51.985 KN
2 2
𝑉𝑢 51.985×42
𝜏v = 𝑏𝑑 = = 0.577N/mm2
300×300
𝐴𝑠𝑡
Pt% = 100× 𝑏𝑑
1350.62300
= 100× = 1.500%
300
Hence 𝜏𝑐 > 𝜏𝑣 the section is safe in shear yet minimum shear reinforcement is provided for beam.
0.87×𝐴𝑠𝑣×𝐹𝑦
Sv = 0.4×𝑏
0.87×415×100.53
= 0.4×300
= 302.472mm
= 300mm
5. METHODOLOGY
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DRAWING
AUTOCAD
ANALYSIS
STAAD PRO
STRUCTURAL ANALYSIS OF
CIRCULAR WATER TANK
DESIGN
Design-Tank dimension, design of footing, column, beam, tank walls, slab and staircase
STAAD PRO Analysis-Structural analysis of circular water tank.
Drawing-Plan and elevation of tank in auto cad, STAAD PRO drawings
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6. 3D MODEL
Fig 6.1
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Design Result
Fy(Mpa) 415
Fc(Mpa) 30
As Reqd(mm²) 1070.000000
As (%) 1.600000
Fig 7.1
Bar Size 12
Bar No 10
Table 7.1
Design load
Load 1
Pu(Kns) 0.000000
Mz(Kns-Mt) 14.560000
My(Kns-Mt) 0.000000
Table 7.2
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Fig7.2
Table 7.4
Table 7.3
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Fig 7.2
WINDLOAD Z-Direction:
Fig 7.3
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EARTHQUAKE X-Direction:
Fig 7.4
EARTHQUAKE Z-Direction:
Fig 7.5
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WATER PRESURE:
Fig 7.6
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Displacement:
Fig 7.7
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Fig 7.8
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The shear force diagram is constructed by starting from one end of the beam and moving along
its length. At any location where a force or a moment is applied, the diagram is updated to
reflect the change in shear force. For example, if a downward force is applied at a certain
point, the shear force diagram would show a sudden decrease in shear force at that
location.The shear force diagram helps engineers and designers to identify critical sections of
a beam where the shear force is maximum or changes sign. These critical points are crucial in
determining the size and placement of structural members, as they affect the beam's strength
and stability.
The Shear Force Diagram represents the variation of the internal shear forces along the length
of a beam or structural member. It plots the magnitude and direction of the shear force acting
on the structure at different locations. The SFD is typically depicted as a series of line segments
with positive and negative values, indicating whether the shear force is upward or downward,
respectively.
1. Shear force changes abruptly at points where concentrated loads, moments, or supports
are present.
2. Positive shear force indicates a tendency to cause upward deformation, while negative
shear force indicates a tendency to cause downward deformation.
3. The SFD intersects the horizontal axis at points of zero shear force.
1. Determining the maximum shear force magnitude and its location in a beam.
2. Analyzing the behavior of a structure under varying loads and boundary conditions.
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A shear force diagram is one which shows variation in shear force along the length of the
beam. Bending moment may be defined as "the sum of moments about that section of all
external forces acting to one side of that section".
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Fig 7.9
BENDING MOMENT:
As its name implies, the bending moment occurs when a force is applied to a structural element
(such as a column or beam), and that external force causes the element to bend and ultimately
fail. Consider a simply supported beam bearing a load: The maximum bending moment in the
beam occurs at the point of maximum stress—the last moment before it fails. This principle is
key in designing buildings for maximum structural integrity
There are two types of bending moments, depending on which way the bending occurs:
Sagging or positive bending: The compression happens in the top fiber, which causes a
tension (or pulling) reaction in the bottom fiber.
Hogging or negative bending: The compression occurs in the bottom (for instance, a force
pushes a horizontal beam perpendicularly from below), causing tension in the top.
Master builder Jordan Smith illustrates the bending moment in this way:
“Your wood will encounter a bending moment when force is applied. For instance, as I walk
across a floor, I’m pushing down—gravity’s pulling me down—and that bends the beam and
puts the top member in compression, and the bottom member in tension.”
Compression: Particles of a material are pushed against each other, causing them to shorten,
or compress. In a building, compression usually comes from the top.
Tension: The opposite of compression, in which a pulling force is working to lengthen the
material. If a beam is being compressed from the top, it will be in tension at the bottom.
Shear: Opposing structural forces cause slippage on a plane. In other words, a shearing force
that causes layers to slide across each other in opposite directions. Buildings need shear walls
to resist lateral, or shear, forces.
You’ll always find these four stresses acting on a structure. Imagine: You’re walking across
the second floor of a house. Your weight is applying compression to the beams holding up the
floor, and as the beams compress at the top, they’re also stretched in tension at the bottom.
This creates a bending moment. The beams are also held together in a web that is in shear. To
maintain structural integrity, the home’s construction must be able to hold all of these forces
in balance.
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Design & Analysis of Circular ESR With Varied Zones
Beam Stress:-
The bending moment, M, along the length of the beam can be determined from the moment
diagram. The bending moment at any location along the beam can then be used to calculate
the bending stress over the beam's cross section at that location. The bending moment varies
over the height of the cross section according to the flexure formula below:
Fig 7.11
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Reaction:
Fig 7.12
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Table no.8.1
Fig8.1
Table no.8.2
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Beam Result:
Fig8.2
Table8.3 Table8.4
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WINLOAD X-Direction:-
Fig 8.3
Water Pressure:-
Fig 8.4
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WINDLOAD Z-Direction:-
Fig 8.5
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Earthquake X-direction:-
Fig 8.6
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Earthquake Z-direction:-
Fig 8.7
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DISPLACEMENT:-
Fig 8.8
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Fig 8.9
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SHEARFORCE DIAGRAM:-
Fig 8.10
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1 Column 1070.000000
2 Column
3 Beam
4 Beam
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10. Conclusion
From the above results it is concluded that for different zones, axial force , shear force and
bending moment under peripheral and interior column of staging varies . But area of steel req.
under peripheral column come out same for all zone and it is varries for interior columns.
From the check equation available, it is also concluded that, the direct stresses and bending
moment induced under peripheral and interior column are within the permissible limit for
Zone - II and for Zone - IV.
From the above tabulated result it is physically observed that, the axial force, shear force and
bending moment for interior columns comparatively more than peripheral columns for both
the conditions i.e. Full and Empty.
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11. REFERENCE
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PROJECT GUIDE
Email :- preetymorey88@gmail.com
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