Bridges

Mario Espindola
Bridges: Compare and Contrast
Two bridges that I would like to discuss are the Truss and the Cantilever bridges.   These bridges are almost exactly the same the only major difference is the degrees of freedoms.
The truss bridge is made out of wood and metal. The truss bridge is supported by posts, piers, triangular sides, and abutments. When a company builds these types of bridges, there are certain conditions to consider. For example they need to consider all the winds, floods, and earthquakes of the area where they will be building this certain bridge. Other factors to take into consideration are tensions the bridge causes, compressions, gravity and torsions. An advantage of this particular bridge is that it supports heavier loads than beam bridges. Another advantage is that this bridge is more coefficient than other bridges. Some disadvantages are that is has the lack of aesthetic appeal, heavy corrosion, and rust.
The cantilever is made out of metal and wood. Cantilever bridges are supported by truss, diagonal braces, and piers. They are also supported by beams, girders, counter weights, caissons, and cofferdams. People who build this bridge usually have to consider everything said in the truss bridge except for flooding. The advantage this bridge has is that this building does not disrupt navigation, and they are rigid. Another advantage is that it has a span greater than a beam. A disadvantage is that it’s really huge, really massive.
Some examples of famous truss bridges are: Fair Oaks Bridge, Jay Bridge, and the Sky Gate Bridge. Some examples of famous cantilever bridges are: Quebec Bridge and the Forth Bridge.