Truss Bridges

In the late 19th century, the transportation demands of Quebec and other provinces success in transportation like Montreal’s success in railways led to proposals for bridging the St. Lawrence River. Quebec Bridge has a long story behind it, a bridge that was proposed first back in 1852 but it was not complete until 1919. It collapsed two times in this duration once in 1907 killing 75 workers and second time in 1916 killing 13 workers. In this report I will emphasize on the first collapse.

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

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

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

Bridges are important, but what makes bridges so interesting? Bridges have been around for a long time. Bridges go all the way back to the Romans with arch bridges and to the suspension bridges in modern day cities. There are various types of bridges, but which one can support the most weight? Truss bridges can support weight because of their meticulously placed beams, but which truss is the best?

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

The truss design, which is a variant of a triangle, creates both a very rigid structure and one that transfers the load from a single point to a considerably wider area. After being used for 2000 years of architectural use, the arch continues to feature prominently in bridge designs. Its semicircular structure elegantly distributes compression through its entire form and diverts weight onto its two abutments, which are the components of the bridge that directly take on the pressure being exerted onto the bridge. The tensional forces in arch bridges are virtually negligible. That is because the natural curve of the arch and its ability to dissipate the force outward greatly reduces the effects of tension on the underside of the arch. The greater the degree of curvature, the greater the effects of tension on the underside of the bridge. If you build a big enough arch, the tension will eventually overtake the support of the bridges natural structure. While there is a fair amount in variety in arch bridge construction, the basic structure of every arch bridge is the same. For example there is Roman, Baroque and Renaissance which are all architecturally different they all have the same basic structure. It is the individual arch itself gives its namesake bridge its strength. An arch made of stone doesn’t need a mortar. In fact the ancient Romans built arch bridges and aqueducts that are still standing today and are made

The truss bridge reflected many of the qualities of America 's industrial society by the early twentieth century: steel-made, mass manufactured, practical and unglamorous, sturdy and dependable, cost-competitive, and highly versatile. Such structures were, wrote David Plowden in his splendid Bridges: The Spans of North America, "appropriate icons to our industrialization." For the developing state of Oklahoma, steel trusses held symbolic value too, for they provided tangible proof to a wider world of economic possibilities.

The truss bridge I will focus on is Hampden Bridge, located in Wagga Wagga, New South Wales. Hampden Bridge is a wood Truss bridge that crosses the Murrumbidgee River in Wagga Wagga, New South Wales. This bridge opened to the public on 11 November 1895 and it was closed in October 1995 due to Wiradjuri Bridge opening. The bridge is 100.5 metres long, all of the 3 truss spans 33.5 metres. Hampden Bridge is the first large overhead-braced truss bridge made by Percy Allan. The bridge was originally designed to be a steel, but the tenders were too expensive. timber was used as the alternative. The Hampden bridge replaced the Wagga Wagga bridge,this bridge was made in 1892 and alos crossed the Murrumbidgee river. Percy Allan made the third of five standard wooden truss bridges. there is a clear difference of development between the pre Allan era and the post Allan era. Allan completely redesigned how timber truss bridges were made in NSW. He often based his bridge design on the American Howe bridge although he exploited the much stronger woods in Australia, to reduce the design its bare essentials, this is show in the differences between the two bridges before Allan made his and Allan’s bridges all around New South

A bridge is a load bearing structure spanning a passage over a gap or barrier, such as a river or roadway. Some examples of bridge types are; suspension bridge (George Washington Bridge connecting New Jersey with New York City), truss arch bridge (Hurricane Deck Bridge in Hurricane Deck, Missouri), and a cable-stayed bridge (The modern Sunshine Skyway Bridge in Saint Petersburg). Another example is a cantilever bridge (the former Sunshine Skyway Bridge). Rarely do these structures ever have catastrophic malfunctions, however, it does happen. The citizens of Saint Petersburg, Florida who have lived here since 1980 remember the collapse of the old Sunshine Skyway Bridge. On May 9, 1980, a large ship hit the Skyway in the fog and it collapsed,

First, I would like to tell you about the Golden Gate Bridge. I’m pretty sure many of you may know about this bridge. The Golden Gate Bridge is a suspension bridge and was built in San Francisco, California in 1937. The Golden Gate Bridge spans or crosses the Golden Gate strait which is a mile wide and 3 miles long. The weight of the roadway is hung from 2 cables that pass through two main towers and are fixed in concrete at each end. Each cable is made of 27,572 strands of wire. There are 80,000 miles of wire in the main cables. These cables help support the bridge because of the big distance. The bridge also has approximately 1,200,000 total rivets. So my opinion about the bridge is that it is a very well made bridge and it also has a very good design.

An arch bridge has a slight Bend in the middle that makes itself sturdy. Most arch bridge is as old as rock itself.A beam bridge is made of many different things mostly steel and prestressed concrete.A beam bridge is the simplest and the oldest bridge ever created. The beam bridge is so simple all it consists of is a log or we can go more advanced with steel and concrete. The beam bridge may be easy and inexpensive to build but is not the sturdiest. The beam bridge is Not sturdy because of the lack of materials used and that it is square. A beam bridge is made for depending on the place, long or short distances.Truss Bridges at the beginning were made of wood and iron . Most bridges were made of stone but the the truss Bridge was made of wood and iron because it can withstand a lot of tension unlike stone. Now a days truss bridges are made of metal. The truss bridge is a very strong bridge.The truss bridge is strong but is very very expensive and hard to build. The truss on the truss bridge is made to keep the wind from blowing it over.The truss is also to keep the tension from

The bridge has a very well designed ‘sustainability’ concept, relying on upcycled materials to complete the bridge. These upcycled materials consist of the wood, the fishing net, the oil barrels and the plastic shielding for the barrels. These materials can be used for functional roles in the design, such as platforms, floatation, safety lines across hand rails, and so on. The bridge’s sustainability concept can be further supported by the ease of replacing materials, and not throwing them in the bin. The materials such as wood, plastic and pieces of metallic bolts and nuts can be recycled and reused for other purposed such as furniture, storage or completely recycled back into a molten form for the metallic objects.

Because of advancements in today’s technology in construction field, many types of bridges are being constructed depending on the requirement and their suitability for the situations.