MONOLITHIC DOMEBy:SHUBHAM PAWAR

IIT BHUBANESWAR

CONTENTS

1. Introduction

2. What is monolithic dome?

3. Characteristics-

a. Latitude and meridian circle

b. Stresses acting on dome

c. Material used

3. Steps of construction

4. Profile and shapes

5. Advantages and disadvantages

6. Comparison with conventional house

7. Conclusion

INTRODUCTION

A curve rotated about a central axis to form a surface, creates a dome.

A rounded building structure typically made of concrete and rigid steel rods.

This structure provides safe shelter for the people with hurricanes and

earthquakes.

An effective alternative to conventional methods

WHAT IS MONOLITHIC DOME?

A form of monolithic architecture.

Thin wall reinforced concrete shell structure.

Structure which cast in one piece form.

Energy efficient and designated as tornado shelter.

Three brothers David, Barry and Randy built and patented first monolithic dome in 1975.

Sizes range from 2.5m to 80m diameter dome.

A Monolithic Dome

CHARACTERISTICS

Latitude :-

Circle of each successive rings increase in downward direction is latitude.

Meridian circle :-

Circle drawn through two diametrical opposite points on a horizontal diameter

and crown is meridian circle.

Stresses acting on dome :-

1. Meridian thrust along the meridian-

Compressive only and increase toward the base. Thrust produced are directly proportional to the weight of its materials.

2. Hoop stresses along latitudes-

Compression at top and tension at the base with transition at an angle 51.8 degree from the top.

Material Used

Airform

Polyurethane foam

Reinforced steel

Concrete

STEPS OF CONSTRUCTION

A reinforced concrete foundation is constructed defining the shape of the base.

Airform placed on the base is inflated through blower fans so that it can take required shape.

Approximately three inches of polyurethane is applied to the interior surface of airform to stiffen it.

It is also the base for attaching reinforcing steel bars.

Steel reinforces rebar is attached to the foam.

A spray mix of concrete is applied to interior of the dome.

PROFILE AND SHAPE

Low profile spherical segment

Hemisphere

High profile spherical segment

Oblate ellipsoid

Prolate ellipsoid

Lower the profile , lesser the expenses.

ADVANTAGES AND DISADVANTAGES

Advantages –

Economy in construction

Economy in operation

Aesthetics and comfort

Security

Disadvantages –

Engineering

Social

COMPARISION WITH CONVENTIONAL

Lower construction cost

Faster construction

Less maintenance

Security

Energy efficient

CONCLUSION

Monolithic dome building technique is an effective alternative to conventional methods.

Monolithic domes are energy efficient and cost effective.

Most safest building that can be built and designed for many purposes.

Monolithic ages better than the other types of structures.

THANK YOU