Bridge QuestBridge QuestAn exploration of what it takes to make a bridge.An exploration of what it takes to make a bridge.

This is what we are going to learn:• What resources are needed to make a

bridge.

• How bridges work.

• What are the different types of bridges.

• What happens when a bridge fails.

• How bridge designs are chosen.

• How to design a truss of your own, using a computer program.

Project:Bridge Busting Competition

Build your own bridge and break it!

This is what we are going to learn:• What resources are needed to make a

bridge.

• How bridges work.

• What are the different types of bridges.

• What happens when a bridge fails.

• How bridge designs are chosen.

• How to design a truss of your own, using a computer program.

Project:Bridge Busting Competition

Build your own bridge and break it!

What What does it does it take to take to make a make a bridge?bridge?

What What does it does it take to take to make a make a bridge?bridge?

How does a bridge How does a bridge work?work?Gravity pushes down and a

bridge pushes back up!

Gravity pushes down and a bridge pushes back up!

What happens when a bridge does not push back up as much as gravity pushes down?

What happens when a bridge does not push back up as much as gravity pushes down?

Bridge Identification WorksheetBridge Identification Worksheet

What type of bridges are these?

Bridge Identification Worksheet Bridge Identification Worksheet Cont.Cont.

What are the differences between What are the differences between these two bridges?these two bridges?

How does a truss work?How does a truss work?

• Uses triangles to form a ridged structure

• Uses triangles to form a ridged structure

• Dissipates the weight through the truss system

• Dissipates the weight through the truss system

Forcing the IssueForcing the Issue

• 2 Forces– Tension

• Pulling Force.

• 2 Forces– Tension

• Pulling Force.

– Compression• Crushing Force• Tries to bend and warp things..

HollowHollowVs.Vs.

SolidSolid

What is the main benefit of a hollow member as opposed to a solid member?

What is the main benefit of a hollow member as opposed to a solid member?

•Is it important to keep the cost of our bridge down?

•How would this affect the construction and longevity of the bridge?

Items to consider:Items to consider:

How can we keep the cost How can we keep the cost down?down?

•Less supports

•Smaller diameter tubing

•Hollow tubing?

•Design a bridge over a nearby river capable of holding an 18-wheeler truck.

•Bridge design must flex but not break when a truck is driven over it.

Your task:Your task:

How will you do this?How will you do this?

Some possible bridge Some possible bridge designs:designs:

How will we be graded?How will we be graded?

Bridge Design ContestBridge Design Contest

•Bridge that costs the lowest to construct and will still hold an 18-wheeler will win an award.

•2nd and 3rd place out of each class will be ranked accordingly