London Bridge is Falling Down, my fair ladies!?! - PowerPoint PPT Presentation

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London Bridge is Falling Down, my fair ladies!?!

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Title: Reach for the Sky: Careers in Building the World s Tallest Structures Author: Tracy Correa Last modified by: Tracy Kijewski-Correa Created Date – PowerPoint PPT presentation

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Title: London Bridge is Falling Down, my fair ladies!?!


1
London Bridge is Falling Down, my fair ladies!?!
  • Dr. Tracy Kijewski-Correa
  • Structural Engineer Assistant Professor
  • University of Notre Dame

2
What is a Civil Engineer?
  • A Civil Engineer is an engineer trained in the
    design and construction of public works.

3
  • Roads, Bridges
  • Stadiums, Buildings, Towers
  • Water Supply, Wastewater Treatment
  • Pollution Clean Up

4
In your opinion, what is the most amazing Civil
Engineering Project? Why?
5
What are some of the common types of bridges?
BEAM
TRUSS
CABLE STAYED
BEAM
DRAWBRIDGE
ARCH
SUSPENSION
6
What is the Worlds Longest Bridge and What Type
is It?
  • Akashi-Kaikyo Bridge, Japan
  • Suspension Type
  • Center span of 6528 feet (about four Sears Towers
    long!)

7
What Bridge To Use?
BEAM
DRAWBRIDGE
SUSPENSION
ARCH
8
Emily Warren Roebling first female Civil
Engineer
 
Chief Field Engineer of the Brooklyn Bridge
(1872-1883)
9
String Challenge
  • Who can lift this shoe in the air only by pulling
    down on the string?

10
This is the same principle used to construct
suspension bridges
Golden Gate Bridge San Francisco, CA
11
Bridge Building Challenge Step 1
  • Cut two short pieces of straw, each 1.25 in.
    long.
  • For each tower, tape two full straws to each side
    of the short piece of straw. Then tape the other
    end of the two long pieces.

12
Bridge Building Challenge Step 2
  • Tape one tower to the edge of a desk or chair.
  • Tape the second to another desk or chair spaced 7
    in. apart.

13
Bridge Building Challenge Step 3
  • Place another straw between the towers so its
    ends rest on the two short pieces.
  • This straw is your bridge deck.
  • Now you have a simple beam bridge.

14
Bridge Building Challenge Step 4
  • Make a load tester by unbending a large paper
    clip into a V shape
  • Poke the ends through a paper cup at opposite
    sides, near the edge
  • Use a second paper clip to hang the load tester
    over the bridge deck
  • Record how many pennies the paper clip can hold
    before the bridge fails. How does it fail?

15
Bridge Building Challenge Step 5
  • Now cut 4 feet of floss (cable)
  • Tie the center around the middle of a new straw
  • Place the new straw between the towers to replace
    the damaged deck
  • Tie the floss tightly to the top of the towers
  • Record how many pennies the paper clip can hold
    before the bridge fails. How does it fail?

16
Bridge Building Challenge Step 6
  • Repair any damage to the towers.
  • If necessary, cut another 4 feet of floss (cable)
    and tie the center around the middle of a new
    straw
  • Place the new straw between the towers
  • Pass the cable over the top of the towers

17
Bridge Building Challenge Step 7
  • To anchor the bridge, wrap each end of the cable
    around a paper clip.
  • Slide the paper clips away from the bridge until
    the cable pulls tight.
  • Tape the paper clips firmly to the desks.
  • Record how many pennies the paper clip can hold
    before the bridge fails. How does it fail?

18
What Led to Difference in Behavior?
Tower
Cables
Deck
Anchor Block
Water
19
For More Interactive Labs and Activities on
Skyscrapers, Bridges and Dams, visit
www.pbs.org/buildingbig
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