Silver Bridge
4.1 Background
The Point Pleasant Bridge or so called the Silver Bridge was designed by the J.E. Greiner Company and built by the Gallia County Ohio River Bridge Company to connect Point Pleasant, West Virginia to Gallipolis, Ohio. It was designed as a two-lane eye-bar suspension type bridge, measuring 2,235 feet in total length, including the approaches. The bridge was the first eye-bar suspension bridge of its type to be constructed in the United States. [26] Figure 4.1: The Bridge before collapse. [26] During the early evening of December 15, 1967, the Silver Bridge collapsed during a period of heavy traffic and 46 people were killed. Another nine people were injured. Of the 37 vehicles on the bridge, 31 fell during the collapse. After some forty years of service, the Point Pleasant Bridge collapsed without warning. [27] Figure 4.2: The Bridge after collapse. [26] The bridge was constructed of carbon steel, which tends to crack. Many cracks were found throughout the bridge among extensive corrosion. Upon investigation, it was found that the collapse was due to a defective eye-bar that experienced a cleavage fracture in the lower part of its head which was resulted from stress corrosion and corrosion fatigue. [26] Since the eye-bars were not designed to be redundant, failure in one eye-bar would disrupt the continuity of the suspension system. This disruption is what caused the bridge to collapse suddenly. The location of the flaw
Tacoma Narrows Bridge was opened to the public on July 1st 1940 after being in construction for 2 years. The structure was built 5,939-foot-long with a span of 2800 feet in order to bridge the gap between Tacoma and Gig Harbour in the state of Washington, USA. It became known as “Galloping Gertie” due to the fact that the bridge
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
At 6:05 p.m. CDT on Wednesday, August 1,2007 with rush hour bridge traffic moving slowly through
Sam: A real life bridge that is similar to our household bridge is the Hoffstadt Bridge. The Hoffstadt Bridge is a truss bridge 96 miles south of Seattle Washington. (show picture)This bridge connects Hoffstadt Creek and Hoffstadt Mountain. The Hoffstadt Bridge is 2,340 feet long, or about 712 meters. Similar to our bridge, this bridge is supported by trusses on the bottom. The Hoffstadt Bridge also has a flat deck such as ours.
"The book is really good, it tells a story about a man who has to blow up a bridge during the spanish civil war. It is a exciting story and a good book to read. The story starts like this: The novel graphically describes the brutality of the civil war in Spain during this time. It is told primarily through the thoughts and experiences of the protagonist, Robert Jordan. It draws on Hemingway's own experiences in the Spanish Civil War as a reporter for the North American Newspaper Alliance.[citation needed]
Stretching across the San Francisco Bay stands the world famous Golden Gate Bridge. The bridge is located in one of nature’s most beautiful settings, spanning the mile-wide bay from Fort Point in San Francisco to the Marin County Shore. Joseph Strauss, specializing in bridge building, was the leader of the construction of the Golden Gate Bridge. The start of construction began on January 5, 1993 and, after four years, was completed on April 27, 1997. The bridge was needed to be built because of the growing population after the California Gold Rush. The bridge was a difficult task for engineers and is now an inspiration. The Golden Gate Bridge is one of the largest suspension bridges and is well known around the world. The Golden Gate
You’re on your way home from work and you are stuck on a bridge in rush hour traffic. All of a sudden the bridge collapses and you along with hundreds of other people are severely injured. This is what it was like for the people involved in the Minnesota bridge collapse, one of the deadliest bridge collapses in history.
At approximately 12:15 A.M. on June 28, 1983, a large section on the Mianus River Bridge collapsed leaving three victim killed and three injured as they were plunged into the Mianus river. The vehicles where two tractor trailers and two passenger cars. A volunteer firefighter and emergency medical technician (EMT) volunteer described moving a girl trapped in a car without the use of a backboard: “If we delayed there could have been a bigger problem with an explosion or fire. You have those diesel trucks with hundreds of gallons of fuel.”
On November 7, 1940, the unthinkable happened to the Tacoma Narrows Bridge. It collapsed at Puget Sound in Washington (state), only four months after its completion and after more than fifty years of insusceptibility from suspension bridge failure. The bridge was by far the most flexible among its contemporaries. Under moderate winds, the deck of the bridge not only swayed from side to side but it would also be subject to severe twisting. The vibrations were so violent that the deck of the bridge was torn away and crashed into the water below. Thus, this could have been prevented
It was located in Staten Island, New York. Also the Verrazano Narrows Bridge was also a double decker suspension bridge and that it had a underneath the bottom of the bridge was a bottom deck. Verrazano Narrows Bridge was one of the largest span of the suspension bridges there was. Also Verrazano Narrow Bridge was one of the best bridges there was and that it could hold a lot of weight and it would look so amazing in the shiny light when the pretty blue light turned to the dark and shabby light. Also it was opened on November 21, 1964 and then years later it had its 50th anniversary but who knows how long it stands now these days. The last thing about this final suspension bridge is that the bridge connected New York City boroughs of Staten Island and
With no reinforcements, their bridge collapsed under the weight put on it. Other groups tried to make a bridge with the least amount of money hold the most weight. In the future, I would try to make a bridge this way. An example of this would be the group of Tucker, Hilary, and Jack in G band.
On the 15th October, 1970, during its third year of construction, the Westgate Bridge collapsed killing 35 men. The section of the bridge that collapsed was a 128 meter span that was being worked on at
The basic design of the Tacoma Narrows Bridge itself was a suspension bridge with a center span of 2800 feet and two side spans of one 1100 feet (Farquharson, 1950, p. 17). Its two lane, reinforced concrete roadway was twenty-six feet wide with two 5 foot, 9 inch sidewalks (Farquharson, 1950, p. 19). Overall the superstructure was 5939 feet, including the suspension structures, approach spans and anchorages (Farquharson, 1950, p. 19). Anchorages were made of solid concrete and were fifty feet by 170 feet and were fifty feet high (Farquharson, 1950, p. 19). The main towers which the cables saddle were 425 feet in height and with a spacing of thirty-nine feet at the top and fifty feet at the bottom (Farquharson, 1950, p. 19). Each cable consisted of nineteen strands of galvanized wire and totaled a diameter of seventeen inches. The design of the bridge may sound rather large and structurally stable but as mentioned before the bridge was designed to be very sleek looking. By
In the community where I grew up folks didn’t read the News Paper to find out what folks had done. They already knew that from the “party line.” They read the News Paper to find out if they got caught.
When building the bridge, weather conditions are a major factor to take into consideration. For example, when it is windy, a suspension bridge will sway from side to side or even bounce up and down, making transportation dangerous for those traveling on the bridge. The Tacoma Narrows Bridge is a very good example of this type of structural failure. It was built to withstand winds up to 120 mph but it collapsed in a wind of only 42 mph after oscillating back and forth repeatedly. Since suspension bridges are susceptible to wind, it is always a challenge for engineers to keep the vertical and lateral swayings within safe limits. Transporting the equipment to build a bridge above such a huge mass of water