Railway

Bridges

•Ahmed Zakaria

•Hammad Khan

•Shahrukh Aqiq

•Ashraf Mehmood

•Asadullah Khan

•Maaz Ahmed

What is a bridge?

Bridge is the structure

which covers a gap

Types of

Bridges

• Arch

• Truss

• Cantilever

• Cable-Stayed

• Suspension

• Keystone – the wedge-shaped stone of an arch that locks its parts together

• Abutments – the structures that support the ends of the bridge

Arch Bridge

• Works by

Compression

Arch Bridge

Marsh Rainbow Arch, Riverton, KS

Railway Arch Bridge

• Piers – the vertical supporting structures

• Cables – thick steel ropes from which the decking is suspended

• Decking – the supported roadway on a bridge

Cable Stayed Bridge

Cable Stayed Bridge

•Works by Tension AND Compression

Zakim Bridge, Boston

Suspension Bridges

•Similar to Cable-Stayed

•Different construction method

Suspension Bridges

• Works by Tension and Compression

Golden Gate Bridge, San Francisco, CA

Other TypesTruss

Southern Pacific Railroad Bridge, Tempe, AZ

Cantilever

Firth of Forth-Forth Rail

Bridge, Edinburgh,

Scotland

Construction of Rail

Bridge and Railway

Tracks.

•The design and construction is similar in a way to a highway bridge

•Example a beam bridge is utilized for short spans and through truss.

•Over truss bridges are used for longer spans.

Railway Bridge

• In construction of a steel railway bridges parallel building and jacking sideways are added

Railway Track

Types of Ballast:

Causes of Railway

Bridges Failure

Reasons Why Rail Bridge Collapse

10 Earth Quake

09 Fire

08 Train Crash

07 Boat Impact

the Judge William Seeber Bridge in New Orleans in 1993. The bridge carried road traffic over a canal, and a barge passing under the bridge struck a pier supporting the bridge and severed it.

Nearly 150 feet (46 meters) of bridge collapsed as a result

06 Flood

The Quebec Bridge collapsed twice during construction before finally being built

05 Construction Error

04 Manufacturing Defects

03 Design Defects

Sometimes, bridges collapse due to design flaws

02 Poor maintenance

01 Odd occurrence

Some bridge collapses just can't be explained at all.

A bridge carrying the Connecticut Turnpike over the Mianus River collapsed in the middle of the night in June 1983

Landmark Railway Bridges

in Pakistan

Kotri Bridge

Location: Indus River Sindh(Kotri & Hyderabad)

Open: 25th May 1900Reconstruct: 1931

Khushal Rail-Road Bridge

Location: Indus River (between Jand & kohat)

Open: 1901Reconstruct: 1907Extras: shortest bridge on Indus River

Ravi Railway Bridge

Situated between Sadiq Pura, Lahore and Shahdara Bagh

on Ravi river.

Opened in: 1876.

It is composed of iron trusses over many concrete piers.

Kalabagh Road-Rail Bridge

Location: Mari Indus & Kalabagh on River IndusIt is originally designed for broad gauge line but narrow gauge line was laid.

Attock Rail-Road BridgeLocation: Attock & Khairabad on River IndusOpened: 24th May 1883 Cost: 3.2 million PKRReconstructed in 1929 Cost: 2.5 million PKR

Highest Railway

Bridges in the world

Mala Rijeka ViaductMontenegro

650 feet high495 foot spanOpened in: 1973

Qingshuihezen, China590 feet high420 foot spanOpened: 2000

Pit River BridgeCA, USA500 feet high630 foot span1942

Santa Giustina Railway BridgeItaly475 feet high256 foot span 1959

Viaduct 13Muçum, Rio Grande Sul, Brazil469 feet high(98) foot span1978

ANY QUESTION?