INTRODUCTION

• In between Cantilever and Suspension bridge.

• 1595(Renaissance period) Machinae Novae, a book by Venetian inventor Fausto Veranzio.’

• On fire since mid 19th century.

CABLE STAYED AND SUSPENSION BRIDGE

TYPES

1. Fan type

2. Harp type

VARIATIONS

1. Side-spar cable-stayed bridge.

– Single offset tower.

– bridge deck(Straight or curved)

around the spar.

Canada

Israel

VARIATIONS(contd.)

2. Cantilever-spar cable-stayed bridge.

– Forward and Backward cantilever.

SpainArgentina

VARIATIONS(contd.)

3. Multiple-span cable-stayed bridge.

Jordan

VARIATIONS(contd.)

4. Extradosed bridge.

– b/n Girder and Cable-stayed bridge.

– Horizontal pre-stressing and support.

– uneconomical

But it’s all about

beauty.

Poland

VARIATIONS(contd.)

5. Cable-stayed cradle-system bridge.

– No anchorage with pylons.

– Epoxy coated steel tubes.

U.S.A.

Millau Viaduct Bridge(France)

• €400,000,000.

• 120 years warranty.

• Engineer: Michel Virlogeux.

• Architects: Noeman Foster, Michel Virlogeux.

• Tallest bridge in the world(343m)

• Heighest road deck in Europe(270m), 12th in World.

• 2,460m length deck.

Structure and Construction

• (4 Shafts per Pylon)*7

• Deck

– 32.05m wide

– 4.2m thick

– Inverse Air foil shape.

– 36000T

• Masts

– 87m tall.

– 11 stays each side.

• Stays

– 55 to 91 cables in each.

– 7 strands per cable.

– 3 protective coats,

• Galvanization.

• Petroleum wax.

• Polyethylene sheath.

– Helical weather-strip.

• Surface for traffic

– Corrosion.

– Bonding.

– Traffic.

– Expansion of deck metal.

– Special Bitumen formula.

• 20km horizontal radius to break monotony.

• 10 to 25k vehicles per day.

• Plasma Cut steel panels.

• Wedge Jacks.(Teflon)

• Electric installations and monitoring.

• Toll Plaza.

• TEMPERATURE STRESSES.– Expansion joints.

– Pylons structure.

Some facts