The key point of our bridge project was to find a bridge that can hold the greatest weight bearing capacity. We made a plank, arch, and truss bridge with craft sticks and glue. Then, we filled the cup with small to large amounts of water in the cup and put on each bridge. The result was that the plank bridge fell at 20 pounds of cup filled with water, an arch bridge fell at 75 pounds, and the truss bridge fell at 90 pounds. In conclusion, our hypothesis, ‘If the bridge has the greatest weight bearing capacity, then it will be the truss bridge which has a truss structure that reduces the stress of the bridge,’ was right. However, we might made some mistake while building our bridges, because we used some ropes for arch and truss because it was
Without a concrete reason for the bridge's failure, every suggested reason was researched until proven incorrect” (Silver). There were many reasons that were suggested, but could not be proven correct due to the collapse. Wikipedia states that “A small crack was formed through fretting wear at the bearing, and grew through internal corrosion, a problem known as stress corrosion cracking.” The failure of the bridge was caused by a defect in one of the eye-bars on the north side causing the other side to collapse as well. “Stress corrosion cracking is the formation of brittle cracks in a normally sound material through the simultaneous action of a tensile stress and a corrosive environment.
Construction of The Peace Bridge in Buffalo New York What can construction do for an area? The construction of an office building may bring in a firm, corporation, or company. The construction of a sporting arena may keep a team where it currently is, or bring a new team to that area. For example, the construction of the HSBC Arena kept the Sabres in Buffalo. The construction of a casino may bring in tourists, or people who live in the outlying suburbs.
The Bailey Island Bridge is located in Harpswell, Maine on Route 24. Before the making of the bridge, the fishermen that lived on Bailey’s Island wanted a bridge that connected their island to Orr’s Island. The town of Harpsweell made and voted on their decisions in the weekly town meetings (“Bailey”). The project was stalled because of some of the mainlanders in the town, but it was brought back up for discussion in 1912. They first agreed on a “road” which would connect the two islands and would be constructed with timber. This was to cost $3,000. The cost quickly reached $25,000 at a later town meting because they decided to build the bridge with stone and concrete instead. Once the legislature decided to pass a bill stating that it would fun state’s highway and bridge projects, they decided to move forward with the project (Hansen, 36).
Bridge to Terabithia is a novel featuring two young characters, Jess and Leslie. These characters both experience realistic problems that many kids their age face every day. Jess has a different personality and imagination than others, which gets him bullied at school. Leslie gets neglected at home, and she’s the new girl at school. Leslie uses her imagination to come up with a funny prank to get back at the school bully.
The Jericho Covered Bridge in Kingsville, Maryland was built in 1865 and restored in 1982. The bridge is 100 feet long and cased in cedar planks and timber beams. Legend has it that after the Civil War many lynchings occurred on the bridge. Passersby were supposedly captured on the bridge and hung from the upper rafters. The bridge is very close to my house and I have driven over it several times. The storyteller, age 19, also lives a couple minutes away from the bridge. He has lived in Kingsville, Maryland his entire life. He recalled a dramatic story he had heard from his older brother involving the haunted bridge.
According to Suspension bridges: Concepts and various innovative techniques of structural evaluation, “During the past 200 years, suspension bridges have been at the forefront in all aspects of structural engineering” (“Suspension”). This statement shows that suspension bridges have been used for over 200 years, and that people are still using them today because they are structurally better bridges. This paper shows four arguments on the advantages of suspension bridges, and why you should use one when building a bridge. When deciding on building a suspension bridge, it has many advantages such as; its lightness, ability to span over a long distance, easy construction, cost effective, easy to maintain, less risk
People who thinks of Thornton Wilder primarily in terms of his classic novella “Our Town,” The Bridge of San Luis Rey will seem like quite a switch. For one thing, he has switched countries; instead of middle America, he deals here with Peru. He has switched eras, moving from the twentieth century back to the eighteenth. He has also dealt with a much broader society than he did in “Our Town,” representing the lower classes and the aristocracy with equal ease. But despite these differences, his theme is much the same; life is short, our expectations can be snuffed out with the snap of a finger, and in the end all that remains of us is those we have loved.
There are two theories (T1: Theory One) and (T2: Theory Two) that have different implications for how to build a bridge. These two theories are similar because they both have not been falsified however they differ because one has been tested and the other has not. The theories are stated explicitly below.
The Tacoma Narrows Bridge is perhaps the most notorious failure in the world of engineering. It collapsed on November 7, 1940 just months after its opening on July 1, 1940. It was designed by Leon Moisseiff and at its time it was the third largest suspension bridge in the world with a center span of over half a mile long. The bridge was very narrow and sleek giving it a look of grace, but this design made it very flexible in the wind. Nicknamed the "Galloping Gertie," because of its undulating behavior, the Tacoma Narrows Bridge drew the attention of motorists seeking a cheap thrill. Drivers felt that they were driving on a roller coaster, as they would disappear from sight in the trough of the wave. On the last day of the bridge's existence it gave fair warning that its destruction was eminent. Not only did it oscillate up and down, but twisted side to side in a cork screw motion. After hours of this violent motion with wind speeds reaching forty and fifty miles per hour, the bridge collapsed. With such a catastrophic failure, many people ask why such an apparently well thought out plan could have failed so badly?(This rhetorical question clearly sets up a position of inquiry-which iniates all research.) The reason for the collapse of the Tacoma Narrows Bridge is still controversial, but three theories reveal the basis of an engineering explanation. (Jason then directly asserts what he found to be a possible answer to his question.)
The results show that the bridge in Case 1 collapsed under 44% of the total applied load with 0.097 inches bending displacement and 0.45 inches buckling displacement, as shown in Figs 10 -11. The bridge collapsed due to the huge lateral movement at the top of the webs, which caused a loss of stability and ability of the webs to carry any load, Figs 12-13. The value of the bending displacement is small compared to the value of the buckling displacement because almost no bending moment was created under this situation, since the webs would not be able to carry the load and transfer it vertically to the bearing support.
However, before doing this we had to look more into depth on the materials we will use to construct our bridge. We also have to consider the possible environmental and geological factors that should be taken into consideration for our model. Pertaining to environmental and geological factors, there are many stipulations that structural engineers take into consideration before the construction of a truss bridge begins. The main objective of the geotechnical engineers are to protect the lives of others and avoid property damage from happening which can be caused by various geological conditions. Geological engineering uses principles of soil and rock mechanics to find surface conditions and materials.The Geotechnical engineers complete works such as: geological hazard assessments, material properties, landslide and slope stability, erosion, flooding, dewatering, and seismic investigations. These engineers closely examine all of these important factors before constructing a bridge in a certain location. According to Teach Engineering.com, constructing a safe and efficient bridge requires an ample amount of time and energy. Environmental and geological factors play a major role in construction, as
Permanent loads, as the name would imply, are those loads, which always remain on a
According to the theory of consequentialism, “an action is morally required just because it produces the best overall results” (Landau, 2015, p.121). In this view, an individual’s action is deemed moral only if it produces the optimific result in any situation. In the article “Framing Effect in the Trolley Problem and Footbridge Dilemma,” the authors introduced the “Footbridge Dilemma”, wherein an individual is given the option to save the lives of five workers by pushing an innocent man towards an incoming trolley (Cao, et. al, 2017, p. 90). In this dilemma, consequentialism suggests that it is moral to push the innocent man and save the workers. Even though pushing the man would kill him, the action would yield the optimific outcome in that
thinks the idea of sardines in the ocean is as strange as oranges on a
Eddie considers Catherine as a little project "I supported you this far I want to support you a little more". As a result Eddie finds it hard to let go of Catherine. This is shown by the fact that is takes Eddie a while to be persuaded by B. that the work is the best thing. Eddie is worried that once Catharine has her job she will get her own place and they will never see her again.