Different Types of Bridges Essay -- miscellaneous

Different Types of BridgesThe quest for travel has al agencys been one that human beings has tried to conquer. First, he traveled on foot, and then developed methods of exaltation such as boats, but one of the first restrictions that he had to repress was acquiring across rivers, waterways, and canals. Today, connects have become a vocalization of terrestrial life hence without them, people would have a much more difficult time going from one place to another. In the United States alone, there ar more than half a jillion tie (History of Bridges 1). Although braces have been in existence since antiquated times, they were not first annoy by man. Nature actually do the first bridges by toppling logs across streams. This was considered the first beam bridge as the flat rocks were employ to support the log. Then, the water eroded the rocks and at long last a stone bridge was formed. The ancient Romans built arched bridges because they needed roads and bridges to connect t he sections of their empire. The original swing bridge, from which the falling out bridge was produced, was a simple vine that swung people over the water. From these beginnings, men created quadruplet main types of bridges. To begin with, beam bridges, also known as girder bridges, be one of the easiest and simplest types of bridges to build. In ancient times, people used to make these bridges out of granite. Beam bridges can be made by putting a wooden plank over an cranial orbit needing to be crossed. To get across larger areas, piers or supports can be fabricated up from the river bed to hold up a touch of beams. The piers of the girder bridge have constant pressure on them. Therefore, the beams, which are ordinarily made out of concrete or poise, have a mussiness of strength so they do not crumble due to the punishing load. Many beam bridges are made of pre-stressed concrete. This concrete has steel rods inside of it, which help resist tension. When the weight pushes d own on a bridge, the top of the beams are pressed together creating compression, while the bottom strand is stretched and causes tension. Beam bridges are not practical in cities with a lot of high rises, because the bridge has very low clearance. The biggest limitation of the girder bridge is its length. The farther apart the piers are, the weaker the bridge gets. Beam bridges are technical to use on spans of up to twain hundred feet ( How Bridges sprain 1). A bridge of greater... ... long way (Bridges 3). A cable-stayed bridge is used to cross medium lengths, which are approximately five hundred feet to two thousand eight hundred feet (Bridges 3). The cable-stayed bridge requires less cable than a rift bridge, and is much faster to build in comparison to suspension bridges. Cable stayed bridges are supported by stave towers. These towers are A shaped, and absorb almost all of the bridges compression. opposed suspension bridges, cable stayed bridges only have two towers and do not need any anchorages.Now that man has overcome the obstacle of getting across rivers, canals, and waterways efficiently, it is now time to perfect these human creations so no more mishaps happen. Even though people keep auditory sense about collapsing bridges, they still use them because it has become a part of their everyday life style. Without bridges, people would have a difficult time getting from one place to another. It could be done by means of a ferry or other boat, but that is time consuming and a real pain in the neck because once a person gets across the river or canal, they would have to walk everywhere. So, without bridges, things would not be the way they are today.