Beam Bridges

The picture show here is... 

• truss
• arch
• beam
• cable-stayed

True or False: A beam (or girder) bridge is the simplest and most inexpensive bridge to build.

• True

• False

A beam bridge is made of horizontal spans supported at each end by

• arches

• beams

• piers

• rhubarb

Why does a beam bridge have to be strong?

• To hold up the sides of the bridge

• To keep from blowing away with the strong winds

• To keep the beam from bending under its own weight and that of the traffic.

When a load pushes down on the beam, the top of the beam is under

• compression

• tension

When a load is pushed down on the beam, the bottom of the beam is under

• compression

• tension

What is imbedded in pre-stressed concrete that resists tension forces and makes it ideal for use in beam bridges?

• steel rods

• wooden planks

• carbon fibers

• nothing

True or False: The farther apart the supports, the weaker the beam.

• True

• False

What is the world's longest continuous span beam bridge?

• Lake Pontchartrain Causeway

• Lupu Bridge

• Golden Gate Bridge

• San Francisco Bay Bridge

How long is the Lake Ponchartrain Causeway?

• 1000 miles

• 24 meters

• 1000 feet

• 24 miles