Bridges_notes


 * 1. Are all bridges alike?**

They all are design to achieve the same function, which to connect places.

Wood, Steel, Iron, strong materials. Cities, communities, neighborhoods. Some of them have a long span between their piers, other have a short span. Some Spans are made from beams, others are made of cables.
 * Think of the bridges you remember:**
 * **What are they made of?**
 * **What are they connecting?**
 * **How is the span between their piers or towers?**

**2. What social and/or political benefits can bridges provide to places?**
They help the communication and connection of people.

they are built because of the need to communicate places, roads, cities.
 * **Why were the bridges built?**
 * **Did they provide benefits? To whom? Why?**

They provide many benefits to the people, and de city they live in and the nation, with good briges comunicating cities, the roads become shorter and iys easier the transport of merchandise.



Ancient bridge in Shangli, China. Ponte dei Salti - Ancient double arch stone bridge, Lavertezzo, Switzerland

=Notes=

Completed in 1883, the Brooklyn Bridge in New York City represents a huge achievement in the world of engeneering. Built in the age when high perfomance computers didnt wxisted, this bridge was built all with man power, being the talest and longer bridge of its time.

=Types of Bridges=


 * Arch Bridge: it works by transferring the weight of the bridge, they are very strong and lasting.

Rainbow Arch Bridge, Riverton, Kansas.


 * Beam Bridge: are the most simple of structure, they are strong and they are commonly used as viaducts.


 * Cable-Stayed Bridge: consists of one or more columns or towers, with cables supporting the road, this cable go from the road, directly to the bridge tower, making them less flexible, stronger, and safe for train to pass through.

The Millau Bridge. France.


 * Covered Bridge: mainly made from wood, this bridges have walls and roof, making them look like a tunnel.

Covered Bridge, Woodstock, Vermont.


 * Cantilever Bridge: It' a bridge built using beams that are only anchored at one end. These Bridges are mostly made of steel beams.

of Forth Bridge, South Queensferry and North Queensferry, Scotland


 * Suspension Bridge: is the type of bridge where the road is held by cables that are suspended by suspender cables that go between the towers. This type of bridge is very flexible, so it is not used for trains because it could be dangerous.

Golden Gate Bridge, San Francisco, USA.


 * Truss Bridge: usually made of steel beams, creating a structure of triangles. these bridges are strong and simple.

Essex County, NY. USA.