DESIGN OF OVERHEAD CIRCULAR WATER TANK

WITH FLAT BASE

PRESENTED BY,SYEDA NUSRATH FATHIMA

INTRODUCTION TO WATER TANKS

TYPES OF ELEVATED WATER TANKS

SUPPORT SYSTEM OR STAGING

DESIGN PRINCIPLES

DESIGN EXAMPLE

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CONTENTS

To study the Analysis and Design of elevated water tanks.

To study the guidelines for the design of liquid retaining structure according to IS Code IS: 3370 part 2-2009 & IS: 456:2000.

To know about the design philosophy for the safe and economical design of water tanks.

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OBJECTIVES

For storage of large quantities of water, tanks are required.

INTRODUCTION

WATER TANK

BASED ON PLACEMENT OF

TANK

BASED ON SHAPE OF

TANK

1. UNDER GROUND 2.RESTING ON

GROUND3. ELEVATED

1. RECTANGULAR2. CIRCULAR

3. INTZE4. SPHERICAL

5. CONICAL

Tanks used to supply water through gravity are termed as Elevated water tanks.

Elevated tanks may have circular or rectangular section with flat or Conical bottom.

For small Storage capacity, tanks square in plan are economical. Where as for large capacities circular tanks prove economical.

They may be made of masonry, steel, reinforced concrete and pre stressed concrete.

RCC tanks are very popular as, Simplicity in construction and design Cheap monolithic in nature Can be made leak proof.

IntzeCircular

Spherical bottom Domed bottom Conical bottom

Rectangular

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COMPARISON OF TANKSRECTANGULAR

TANK CIRCULAR TANK INTZE TANK PRESTRESSED TANKS

For smaller capacities

rectangular (square) tanks are

economical.

For large capacities circular tanks are

economical.For same capacity, circular tanks requires less concrete

than rectangular tanks.On account of circular

shape, it can be made water tight easily as there

are no sharp corners.

Intze tank is constructed

to reduce the project cost

because lower dome

in this construction

resists horizontal

thrust

For bigger tanks,

prestressing is the

superior choice

resulting in a saving of up to 20%.

Elevated tanks are supported on staging which may consist of Masonry Shaft, R.C.C tower or R.C.C. column braced together with tie beams.

SUPPORT SYSTEM FOR RECTANGULAR TANKS

•The simplest form is Rectangular tanks supported by beams and four columns.•With increase in plan area, Internal beams and columns are introduced to limit the span.

SUPPORT SYSTEM FOR CIRCULAR TANKS

Circular beamMasonry tower 4 beams mutually orthogonal2 beams mutually orthogonalInternal beams and ColumnsSingle Annular shaft

Design of Tank• Cover slab or Top dome

• Top ring beam

• Side walls or Cylindrical wall

• Base slab

Design of Staging

Design of Foundation

DESIGN OF ELEVATED WATER TANKS

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