railway bridges because it made good use of iron. The Pratt has many variations‚ most with their own unique name. For instance‚ the Baltimore‚ Pennsylvania‚ and the Parker are all based off the Pratt. Pratt Truss How the forces are spread out Here are two diagrams showing how the forces are spread out when the Pratt Truss is under a load. The first shows the load being applied across the entire top of the bridge. The second shows a localized load in the center of the bridge. In both
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2/4/2013 Bridge improvements Building a bridge was trial and error. This is not something you can do over night. When building the bridge I have to focus on the structure‚ details and actually putting it together right. The structure of my frame I made with the thicker wood‚ but it should have been placed different. Looking at the data from testing other bridges‚ the bridges who double bonded their wood at the bottom last a lot longer that the one piece of wood. My bridge failed when one
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Bridges started in ancient Rome‚ and from that point on‚ the understanding of them spread slowly. Both architectures and engineers helped bridges to become a more advanced structure all over the world throughout the years. In the beginning it was known that to build a bridge was very simple‚ all you really needed was natural resources around you‚ such as tree logs and stone. The purpose of bridges is to provide an easier passage way over any interference that your vehicle can not go through such
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Bridge Instruments Bridge Instruments Various types of bridge circuits are used in instrumentation. They can operate in either deflection mode or null principle. They give very high degree of accuracy. Bridges Instruments are used to measure • Resistance‚ Inductance‚ Capacitance • Purity of components • Impedances and admittances • Physical parameters Bridge Instruments Types of Bridges • • AC Bridge DC Bridge DC Current Bridge Instruments • Wheatstone bridge and
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The Tacoma Narrows bridge of 1940 was a disastrous‚ yet amazing‚ flawed‚ yet stunning structure. The Tacoma narrows bridge travels across the Puget Sound river‚ connecting Tacoma and the Kitsap Peninsula. It was located in Washington State‚ before tragedy struck. The bridge‚ the 3rd longest suspension bridge in the world at the time‚ was designed by a man named Leon Moiseff‚ helped by Elmer Maxwell Hayden‚ Clark Eldridge‚ Frederick Bert Farquharson‚ Lacey V. Murrow‚ and around 225 workers with
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The Brooklyn Bridge (initially known as the "New York and Brooklyn Bridge") links the districts of Manhattan and Brooklyn in New York City . It was built between 1870 and 1883 and‚ at the time of its inauguration‚ it was the largest suspension bridge in the world (1825 meters long‚ and the light between pillars is 486.3 meters)‚ a record of light until 1889 the Forth Bridge is built ‚ with a maximum light of 521 m. It was also the first suspended by steel cables . Since then‚ it has become one of
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Signature Bridge The Yamuna Bridge at Wazirabad is an unsymmetrical cable-stayed bridge with a span of 251 meters and length of 675 meters. The bridge’s composite deck carries 8 lanes (4 in each direction). It is about 35 meter wide and is supported by lateral cables spaced at 13.5 meters interval. The height of the steel tower is approximately 150 meters. The area around the bridge will later be developed into a park and the Yamuna River will be widened to lake like dimensions. At the same time
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Suspension bridges come in two different designs: the suspension bridge‚ recognized by the elongated ’M’ shape‚ and the less-common cable-stayed design‚ which has more of an ’A’ shape. The cable-stayed bridge does not require two towers and four anchorages as does the suspension bridge. Instead‚ the cables are run from the roadway up to a single tower where they are secured. Forces on a cable-stayed bridge A cable-stayed bridge near Savannah‚ Georgia‚ USA A typical cable-stayed bridge is
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Bridge Project Questions 1- History of Bridges In the beginning bridges were very simple structures that were built from easily accessible natural resources- wooden logs‚ stone and dirt. Because of that‚ they had ability only to span very close distances‚ and their structural integrity was not high because mortar was not yet invented and rain slowly but constantly dissolved dirt fillings of the bridge. Revolution in the bridge construction came in Ancient Rome whose engineers found that
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The trestle bridge is built with lateral and angled bracing‚ and horizontal and vertical reinforcements; to ensure the bridge can bear maximum weight. The base of the bridge is simply constructed with lateral bracing which is connected by horizontal panels that are connected to a horizontal‚ upright‚ panel on either side. Although‚ engineers rarely place lateral bracing on the base‚ it provides for extra stability. Moreover‚ the base also has upright and angled Popsicle sticks connected to the lateral
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