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Transcript of Bridges
History: The is one of the oldest type of large bridges in the united states. The first truss bridges were built around the 1820's. They were made of wood and were used to transport heavy carts when the railroad became popular in the 1880's and 90's they started to be constructed of iron and other strong metals. Strengths and weaknesses of truss bridges Strengths:The truss bridge can support and resist lateral loads. Unlike the arch and beam bridge, Truss bridges prevents twisting and swaying during earthquakes and high winds. It resists forces of compression and tension.
Weaknesses: Some weaknesses are its durability such as buckling, fatigue, cracking,seismic forces, and torsion. Famous Truss bridges The Bailey Bridge: developed by the British during World War II for military use and was used by both British and the American military engineering units. The ikitsuki bridge: The longest span from 1991 to the present. Construction process A triangulated framework of elements that act primarily in tension and compression. Trusses may be used as girders below the deck level, or as through girders with the deck at the bottom of chord level Cable stayed bridge History: Cable-stayed bridges have been around for about 40 years ago. In Germany, particularly in Rhine and Elbe rivers, these kinds of bridges were built to replace the bridges that were destroyed during the World War II and these improve the highway transportation system. Strengths & weaknesses
Strengths: Its overall stiffness and reduction in vertical deflection. Its more economic in which they require less materials. It can be constructed faster, at a lower cost due to the fact they require smaller anchors, less tension wire, and reduction in the size of the bridges foundation.
Weaknesses:Cant withstand high frequency wind forces due to their lightness in weight. The cables require careful treatment to protect them from corrosion. Famous cable stayed bridges Sunshine skyway bridge: The Russky bridge:
Which has the longest span of a cable stayed bridge in the world. construction: They start by building concrete forms for pillars. They then pour the pillars and place anchor bolts or steel connecters into the concrete. They set pre cast towers on the concrete base and then thread cables through the pillars. Then they attach these to the decking cantilever style. From there they just fill in the bridge. Suspension Bridge History: Some of the earliest suspension bridge cables were made from twisted grass. Rope made from bamboo, itself a form of grass was used to hang the anlan suspension bridge in china first constructed about A.D. 300. Today suspension bridge cables are made of thousands of individual steel wire bound tightly together. Strengths:
A definite advantage of suspension bridges is their ability to be used over waterways. The bridges spans, especially the central one, can be very long, making them ideal for large bodies of waters or canyons. A suspension bridge’s base can also be very tall, allowing ships or other water vessels to easily pass beneath the bridge. (Ryn Gargulinski)
weaknesses: the economic value of the suspension bridge, they are more expensive than most bridges. Famous suspension bridges: Golden gate bridge, spanning 1280 meters Akashi-Kaikyō Bridge:It is the tallest, longest and the most expensive suspension bridge in the world. Construction process:
Suspension bridges are built by constructing the bases and then working on the bridge from the top. No one needs to dangerously dangle beneath the bridge as it’s being constructed. On the downside, suspension bridges that span wide or deep waterways require workers who dive to the depths of the waterway to set up the supports on the waterway floor. (Ryn Gargulinski)