One of Roebling’s greatest implementations in the Niagara Falls Bridge was his lattice truss design. Unlike the standard lattice truss systems where the diagonal beams lie over each other, his system interlaced the diagonal beams. This provided the structure with a higher rigidity than what was previously possible using traditional methods. This design was not flawless, however, as it substantially reduced the effectiveness of the diagonals. Roebling thought this compromise was acceptable given that the bridge supports served to buttress the system. Another advantage of the diagonal iron bands is that it avoids wooden joints which are comparatively movable and reduce the resistance of the system. A horizontal giving way (buckling) of the truss level is not possible since at the final point the vertical poles take only pulling tension…
The first being that both the top and the bottom chords for the anchor and cantilever arms of the bridge were mostly designed as straight pieces. This was done to make the construction of the bridge easier and cheaper. The top chords that attached to the anchor and the cantilever arms on the Quebec Bridge were created to be slightly curved, because the engineers believed it looked more aesthetically pleasing. However, the curvature of the chords added to the secondary stresses on the members, and reduced their buckling capacity. The engineering records for the building of the Quebec Bridge has stated in it, “As a rule secondary stresses are much more dangerous in tension that in compression members, which seem to have been the first to give way in the Quebec…
Since 1915, the University of British Columbia opened for business in a temporary headquarters in McGill University College facilities; it is ranked among the best 40 best universities in the world and considered as public institution for the Ministry of Education in Canada.…
The bridge was a twin rib arch bridges and the arch was 1050 feet that reached from one side of the canyon to the other. These arches were Concrete-Steel Composite Arches and are the only kind of this in the United States. It is also the 2nd highest bridge in the United States.…
Each type of design is although, unique in its own way, fulfills the desired goal that the Truss Brides are made for. The purpose of this experiment is to research various bridges and build a similar one that gave the students the highest inspiration. For one case in particular, the bridge design was in-spired by the Pratt Bridge and almost every height, width, and length met the requirements ex-cept for the length on the bottom part of the bridge, it exceeded the maximum height that was asked. Moreover the bridge held a total of 20 pounds before one of the top sticks snapped. Alt-hough it performed a decent job, the bridge could have held more weight if there were more di-agonals to provide more support so the bridge wouldn't break. Furthermore, this bridge fulfilled its goal and held a large amount of weight for such a small bridge. These bridges are also very significant for this planet because it is very resourceful and effective, as well as…
The related costs, dimensions and load capacity of the bridge It was decided that balsa wood and a Pratt truss would be the most appropriate materials and design to use for this application. This was due to both materials being strong, effective and cheap, allowing the raw materials cost to remain low while also preventing over engineering. This is a reasonable result for a light prototype bridge which only weighs approximately 150g. Table of Contents 1.0 Introduction ...................................................................................................................................…
The most exhilarating, terrifying ride of the year is soon going to be opening! The Railroad Bridge is a terrifying ride guaranteed to make passengers feel the adrenaline coursing through patrons veins. This ride come from the urban legend that comes from a railroad bridge on Susco Road in Pennsylvania. In the legend it says it is a bridge where a bride supposedly hung herself, and some say if patrons put passengers keys on patrons car on the site, passengers can see the bride in the mirrors.…
Truss bridges are recognizable because of their numerous, relatively small interconnected triangles. This framework of triangles is used for is strength to withstand tension and compression forces. They are considered a light-weight yet a very stiff form of construction. At first they were built of wood, then with the discovery of welding they began to build then using iron, then steel. Occasionally, a combination of the materials may be used. There are actually 30 different kinds of truss bridges. Truss bridges were commonly built before the 1930’s. They are considered expensive to build today and are considered to be labor intensive and costly to maintain. Truss bridges are frequently found to be used for railroad bridges and typical spans can range from 40m to 500m.…
This story is about two friends named Joe and Sam heading to Pittsburgh from New York City. Sam took the back road instead of taking the highway to Pittsburgh. This shows Sam is a person that doesn't rush things. The two friends in the story were in Pittsburgh and saw many historical attractions that attracted them. One of the historical attractions that attracted them was the Rockville Bridge. Another historical attraction was the Dauphin Borough Statue of Liberty. The message in this book was the back roads is not only a ride. It is a journey full of adventure like this historical adventure that you can't get from a highway.…
Ambrose Bierces' story "An Occurrence at Owl Creek Bridge" tells the story of a confederate secessionist, who is being hanged by Union troops. At the time of the hanging, the soldiers drop him from the bridge. Luckily, just as he falls the rope snaps and the man dives into the "sluggish stream". He miraculously takes of his ropes and swims away. When he reaches the bank of the creek, he runs for what seems like forever. He finally reaches home, where his family is waiting so anxiously for him. However, Bierce chooses to surround this intriguing tell with elements that carry visual, concrete, and intangible symbolism. The symbolic elements of "An Occurrence at Owl Creek Bridge" imply that the protagonist, Peyton Fahrquhar, is out of touch with reality, which evidently leads to the added twist at the end of the story.…
After taking a trip to the Laumeier Sculpture Park, one of the works of art that stood out was the unique “Triangle Bridge Over Water” sculpture. This art was created by Dan Graham in 1990. Dan Graham was born on March 21, 1942 in Urbana, Illinois (Jeannette 1). As an artist his main works focused on video art, mirrors, and architecture. Which some of these focuses can be especially brought out in the “Triangle Bridge Over Water” work.…
Assignment Discovery Online Curriculum Lesson title: Famous Bridges Grade level: 6-8, with adaptation for older students Subject area: Physical Science, Technology Duration: Two class periods Objectives: Students will: 1. Understand the benefits and drawbacks of different types of bridges. 2. Investigate the history and structural challenges of a prominent bridge. 3. Think about the challenges involved in building bridges. Materials: The class will need the following: • Computers with Internet access (optional but very helpful) • Reference materials on bridges Each group of three or four students will need the following: • Research material about a particular bridge (Web sites and books suggested below) • One long piece of butcher block paper • Pencils, colored markers, and crayons Each student will need the following: • One copy of the Classroom Activity Sheet: Bridge Research and • One copy of the Take-Home Sheet: Longest Suspension Bridges in the United States This lesson plan can be enhanced by purchasing a copy of the documentary Bridges: Design and Function at our School Store. The program airs on the Discovery Channel February 12, March 19, April 23, and May 28, 2001. Procedures: 1. Introduce the lesson by showing the class a picture of a popular bridge, such the Golden Gate Bridge (San Francisco) or the Brooklyn Bridge (New York City). Ask students to imagine what might happen if all the bridges in New York City or San Francisco were suddenly shut down. Then help the class brainstorm some ways that bridges affect our lives. For example, 1…
Most suspension bridge roadways were lighter because light structure would put less stress on the cables. However, this light structure would not be a good support for the bridge since it can sway in the wind. Therefore, Roebling decided to use steel wires to support roadways which is why the bridge was considered not only a suspension bridge, but also a hybrid cable-stayed bridge. Just like any suspension bridge, Brookyn Bridge has anchor, approaches, towers, deck, cable, hanger and foundations. The marvel stone towers of the bridge are made of mostly granite with a mixture of limestone and Rosendale cement. These towers are considered gothic towers due to its similar visual to Gothic architecture from medieval period. Additionally, these two towers have arches that can be compared to a Roman architecture “ The Arch of Constantine” (History,…
According to the U.S. Bureau of Transportation Statistics, there are approximately 600,000 bridges in the United States. The world's longest bridge is the Danyang–Kunshan Grand Bridge in China. The most expensive bridge is the Oakland Bay bridge in San Francisco. According to Guinness world records, the oldest bridge is the Bridge Over River Meles in Turkey. The Zhaozhou Bridge is the oldest standing bridge in China and the world’s oldest stone segmental arch bridge. The Brooklyn Bridge in New York was the longest suspension bridge when originally built. There are many more interesting facts about bridges but those are the main ones.…
Have you ever crossed a bridge when driving around your city and thought about how it was constructed or how long did it take to be built or is this bridge really safe and will it ever fall down. Well, I certainly have and I know that I don’t want for a bridge to fall down whenever I am driving or walking across one. It was 6:05 pm, the rush hour in Minneapolis, Minnesota and the unimaginable at the I-35W bridge occurred. On August 1, 2007 the 1,907 foot long bridge collapsed leaving dozens of cars and trucks trapped and in the Mississippi River. The accident left 13 people dead and caused for 145 to be injured. This paper talks about the structural form of the I-35W Bridge, some circumstances that lead to the collapse, why the bridge fell…