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The History of Bridges

The History of Bridges. Walkin ’ cross stuff in style since 200 AD. Why History?. Engineers, who design and test objects, always study history History, in most cases, is easier to study than doing experiments all over again. Bridge successes. The Sydney Harbor Bridge:

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The History of Bridges

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  1. The History of Bridges Walkin’ cross stuff in style since 200 AD

  2. Why History? • Engineers, who design and test objects, always study history • History, in most cases, is easier to study than doing experiments all over again

  3. Bridge successes • The Sydney Harbor Bridge: • Widest bridge in the world • Arch bridge made of steel that boats can pass under

  4. Bridge Successes • The Verrazano-Narrows Bridge • Longest suspension bridge in the world • Located in New York City

  5. Bridge Successes • Golden Gate Bridge • Another long suspension bridge • Takes thousands of gallons of paint each year to keep bridge from rusting • This is true of all long suspension bridges

  6. Bridge Successes • The Anji Bridge • Built by Li Chun • World’s first shallow arch bridge • Could not put column in middle • Has stood for 1400 years

  7. Catastrophes • The Ashtabula Bridge • Built with Iron, one of the first • Iron was too heavy and needed to be redesigned by chemists and engineers

  8. Catastrophes • The Quebec Bridge • Needed to be built longer • Building longer did not account for extra weight • Bridge bent for weeks and finally broke

  9. Catastophes • The famous Galloping Gertie • Tacomas Narrows Bridge • Built too thin • Destroyed by wind

  10. Terms to know • Tension – force of stretching • Compression – force of being pushed in • Sheer – force of sliding together • Abuttment – support on the side of a bridge

  11. What do successes have in common? • Detailed planning • Extra money • Extra time • Arguments and openness

  12. What do failures have in common? • Rushed • Not enough money • No openness to new ideas • Hard deadlines

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