Bridge Building 101Presented by KEEN

Day-to-Day Lives

Engineering touches every aspect of our lives.

Roads you drive Bridges and overpasses

Transportation Cabinet

Design Roads Design bridges Traffic Construction Maintenance

A Balancing Act

Support its own weight. All forces must be in balance or

bridge will fall. Two major forces act on the

parts of the bridge. Compression – pushes on or

squeezes bridge parts. Tension – pulls on or stretches

bridge parts.

Types of Bridges

Suspension Cable-Stayed Truss Steel I-Beam Concrete I-Beam Covered RCDG Bridge

Suspension Bridge

A bridge with overhead cables supporting its roadway.

One of the oldest of engineering forms, suspension bridges were constructed by primitive peoples using vines for cables and mounting the roadway directly on the cables.

Suspension Bridge

Golden Gate Bridge, San Francisco

Suspension Bridge

George Washington Bridge over the Hudson River.

Suspension Bridge

Suspension bridge across the Ohio River at South Shore, KY.

Suspension Bridge

Maysville, KY

Suspension Bridge

Bridge Anchor

Cable-Stayed Bridge

Follows the cantilever method The tower is built, one cable

and a section of the deck are constructed in each direction.

The process is repeated until the deck section meet in the middle where they are connected.

The ends are anchored at the abutments.

Cable-Stayed Bridge

Cable-Stayed Bridge

Cable-Stayed bridge across the Ohio River at Maysville, KY.

Cable-Stayed Bridge

View looking North at KY Tower.

Cable-Stayed Bridge

Stay Pipe Anchor – Ready for Deck pour.

Cable-Stayed Bridge

Stay Anchors looking South.

Cable-Stayed Bridge

South face of KY Tower.

Cable-Stayed Bridge

Final 120’ span – Looking North.

Truss Bridge

A Truss is a structural member usually fabricated from straight pieces of metal or timber to form a series of triangles lying in a single plane. (A triangle cannot be distorted by stress)

Truss Bridge

Astoria Bridge over the Columbia River, Oregon.

Truss Bridge

13th Street Bridge over Ohio River at Ashland, KY.

Steel I-Beam Bridge

KY 32 Bridge over Little Sandy River in Elliott Co.

Steel I-Beam Bridge

Concrete I-Beam Bridge

Bridge in Fleming County.

Concrete Box Beam Bridge Hancock County

Concrete Box Beam Bridge

Covered Bridge

A timber-truss structure carrying a roadway over a river or other obstacle, popular in folklore and art but also of major significance in engineering history.

The function of the roof and siding, which in most covered bridges create an almost complete enclosure, is to protect the wooden structural members from the weather.

Covered Bridge

Covered Bridge, Mount Union, PA.

Covered Bridge

Goddard Covered Bridge, Fleming Co.

RCDG Bridge

Fleming County