Pratt Truss Bridge Essay

In the small town of Waco, Texas who would have thought it was once well known for the structure of a bridge, the Waco Suspension Bridge to be exact. Up until 1870, the Brazos River was just a simple river that had no special meaning to it. The land around it was empty, occasionally you would find cattlemen pushing their cattle across stream, but that was only because you could not find one bridge that spanned the eight hundred miles of river flowing through Central Texas. This caused a serious transportation issue for merchants and travelers. It became clear that a better means of crossing the river was necessary.

Initially, suspension bridges before 1940 were made of piers, towers, wires, anchorages, and roadways. Piers were the main foundation for the suspension bridges. There usually were two of them, which were made out of cement and were entrenched in ground underneath the body of water that the bridge was spanned across. Towers were built on top of the piers to provide a means of connection for the roadways and wires. Wires were connected to the towers, roadways, and anchorages to provide tension support for the weight of the bridge. The anchorages were large cement platforms that were planted into the ground on either side of the land so that the wires could be connected to it. Lastly, the roadways were the main point of the suspension bridge. They usually were wide enough to provide four lanes of traffic and stretched from one side of the bridge to the other. This was the basic design of the suspension bridges

Calculations were performed to determine the effectiveness of the design of the platform. Allowing for a safety factor of 1.5 times the design weight of 10kg and considering the bridge must not be overdesigned; plans were made for the bridge to fail at 25kg, 2.5 times that of the design weight. According to the calculations, the bridge would hold a load of over 15kg and experience failure at 20kg in the members. These calculations were later disproven in the testing, breaking 8kg earlier than expected, due to unforseen errors. An analysis of the bridge design and calculations has been included at the end of this report.

Bridges are a vital part of people’s everyday life and without them people would not be able to do nearly as much as is possible today. The weather in the outer banks of North Carolina is very rough and can be very detrimental to the various structures on them. When hurricanes come near North Carolina the outer banks are hit the worst. Bridges on the outer banks keep being destroyed by weather and so the people there have to think about the cost, the effectiveness, and the need between a strong expensive bridge that will be able to handle rough weather or a cheap quick to build bridges that may fall with any extreme weather.

Since the early days, the men try overcome environmental challenges and, in this process, ends up creating amazing masterpieces of engineering. Among this works, the bridges appears as the clearest representatives of how the mankind could adapt to Earth’s contours. If the shape of landscape can’t be changed, the bridges are the solution to link two places and allows the connection of the traffic to improve aspects such as the communication and the trade. Depending to the need, to the sources and to the environment, the bridge can be constructed in a specific configuration. There are five main sorts of bridges configurations. First, there is the simplest bridge, the beam bridge. Second, the arch bridge, one of the oldest kind. There are the truss, composed of set of trellises. Lastly, there are the cable-stayed and

Several students are doing Science Fair projects at Woodstock Middle School and I am one of the seventh grade students. The topic I shall be doing is on how bridge structure affects the weight bearing capacity. I chose this specific topic to guide bridge builders in the right direction on what bridge is safest for public use. The key topics I plan to research on include the following: Beam, Warren Truss, suspension, cable-stayed, and arch bridges. I shall use the scientific method to guide me through this process.

The Pratt truss bridge was originally founded by Caleb and Thomas Pratt in 1844. It is mainly used to carry trains. The biggest advantage of this bridge was its low costs for construction and the materials to construct a truss bridge are minimal. It also use materials that is cheaper and light in weight. We can easily identify a pratt truss by detecting its diagonal members, which (excluding for the very end ones) all slant down and in toward the center of the span. The pratt truss was designed by applying few laws that related to the mechanics of materials concept. The bridge is mainly built using steel girders to support the construction of the structure. The below part of bridge weight is high so, it need an enough support to prevent from

Truss bridges have been around for a long time. I see truss bridges the most out of all the different types of bridges and to me it seems like the most popular type of bridge. In addition there are thirty different types of Truss bridges which means that there is a bigger variety of Truss Bridges instead of just having one type. Truss bridges have triangular shaped beams that go all across the bridge. The bridge also is above the roadway instead of under the roadway like the arch bridge. Truss bridges could also stretch very far. The longest cantilever Truss bridge that goes is called Crescent City Connection and it is 13,418 feet long with a width of 52 feet. There is also a really long Truss bridge that is near Hoboken, the name of the bridge

Uncle Hammer drives in font of the Wallces in the bridge. Uncle Hammer made the wrong decision pretending to be Mr.Granger. I think because of this lead up to Mama getting fired. It also means that the Night Men might come after them. The night men poured kerosene over Mr. Berry and his nephews and lit them on fire. This could happen to the Logan's for what they did to the Wallaces. The Wallaces would do up to anything to the Logan for the embarrsent they did.

Bollman truss had many independent tension elements that makes a strong bridge which is easy to assemble.

This report mainly presents causes and consequences that resulted in the structural failure of the I-35W Mississippi River bridge which was constructed since 1964 and the further implication for me. It was found that the bridge collapsed due to undersized gusset plates, inefficient maintenance project and overloaded equipments. As a result of the abrupt collapse that brought about 13 dead and 145 injurers, the state government carried out a series of effective rescue, forced the designing company to pay the price and exerted themselves to eliminate pressures imposed on both traffic and business. It can be concluded that qualified engineers are required to be both ware of social responsibilities of engineers and adept at the professional skills that they specialised respectively.

The Washington State Bridge and Structures office is responsible for managing Washington state’s bridge inventory. There are roughly 7,300 bridges in the state, of which 74% are concrete structures (WSDOT Web). Bridges have an average expected life cycle of 75 years. The average age of existing bridges in Washington State is 45 years old, therefore are over halfway through their expected life-cycle (WSDOT Web). To ensure safety of the public, periodic inspections and repairs must be performed to maintain and improve the serviceability of the bridges.

The introduction to the modern era through historical framework of Brooklyn Bridge was very insightful. By situating myself in this time period, in which the bridge was constructed, it became clearer as to why the construction and creation of the bridge in itself can be viewed as monumental. Before exploring the intricacies of the Brooklyn Bridge’s inception, I viewed the bridge mainly as a historical relic. I believe my initial perception of the bridge left me underwhelmed because I was approaching it from a twenty first century point of progress. I think the most important point of progress to my understanding this time period in early modern America, is to try situate myself in the historical context of this time without distorting it with

The story of bridge gate is when the Fort Lee lane was closed (also known as George Washington Bridge lane Closure) causing major traffic problems during morning rush hour on September 9, 2013. This was two to three toll lanes that were connected to a local street. The lanes were not reopened until Friday, September 13, 2013. The order was given to reopen the lanes by port authority figure Patrick Foye. Mr. Foye was the executive director of the port authority. It was later found that David Wildstein ordered the closures along with Bill Baroni who notified the press that the closures were due to a traffic study. Three people were indicted for this crime. David Wildstein who ordered the closure, Bill Baroni, and another aid to Chris Christie,

The bridge of sighs is This lab use spaghetti with the bridge to see how many pennies it can hold.There are interesting facts about bridges ,I also stated its tie to our lab. Thousands of tourists have crowded onto and around San Francisco's Golden Gate Bridge to celebrate the iconic structure's 75th birthday.Crowds partied across its three-kilometer length, boats cruised on the water below and a finale of fireworks lit up the San Franciscan sky. It took four years to build, costing US$35 million and finally opened in 1937. It has remained one of the engineering world's most famous poster boys since. But it's not the only bridge that merits celebration.Here