Bridges and Tunnels

Danyang-Kunshan Grand Bridge is the longest beam bridge in the world and is approx 164.8 kilometres long.

Suspension bridges can be used for longer distances, compared to others like truss bridges and Arch bridges.

In mechanics, a rigid bar that pivots about one point and that is used to move an object at a second point by pressure applied to a third point. The pivot therefore is variable according to the weight of the object to be moved

Once Archeologists established animals and people could have been able to walk from Asia to North America, they offered the following explanation. Bands, or small groups, of hunters left Asia more than 11,500 years ago. They may have moved across Beringia to present-day Alaska. From there the hunters traveled south.

There are 985,000 light on the Golden gate bridge

Sunshine Skyway Bridge was created in 1954.

It was first built by the Romans about 50 AD and there have been several rebuilds since then, the last being in 1973.

I think they have to be painted because if you do not paint something that is steel than it will rust beyoned repair.

beam and tunnel

If you have a arch bridge it has formulas for the arch and how much weight a given bridge can support. The easiest way to think of this question is all the math a engineer would have to do in bullet Grus blueprint for a bridge.

Hot weather causes the metal the bridges are made of to heat up and expand. If there was no space for them to expand then the bridge would either crack it's foundations or tear itself to pieces.

The Tidal Basin Bridge, located in Washington, D.C., was built By Archibald (Archie) Alphonso Alexander.

The lights are actually pink in honor of National Breast Cancer Awareness Month. See the Related Link below.

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it make it strong as it is the strongest shape.

hope this helped.

i tried to figure out this question whilst helping my daughter with her pointless science question 'Why are structure with triangles in them strong

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The Lupu Bridge crosses over the Huangpu River, in Shanghai, China.

because of the support of the circles

could be the tulip trestle in Greene county Indiana

Work began in 1980 and it opened in 1984.

I think it changed bridge building laws

Fourteen bridges span the Harlem River. In order from north to south, they are the:

1) Spuyten Duyvil Bridge

2) Henry Hudson Bridge

3) Broadway Bridge

4) 207th Street-University Heights Bridge

5) Washington Bridge

6) Alexander Hamilton Bridge

7) High Bridge (the oldest bridge in New York City, though no longer in use)

8) Macombs Dam Bridge

9) 145th Street Bridge

10) Madison Avenue Bridge

11) 3rd Avenue Bridge

12) Willis Avenue Bridge

13) Triboro aka RFK (Robert F. Kennedy) Bridge

14) Wards Island Bridge.

because the bridge will fall any time and some times theres to much wait

Truss Bridges=Trusses have been used extensively in bridges since the early 19th Century. Early truss bridges were made of wood.==in additon the classic American covered bridges are all trusses, though the wooden truss members are covered by walls and a roof, for protection from the elements. Later truss bridges were made of cast iron and wrought iron. Most modern trusses are made of structural steel.=