# Truss Bridge Design

Good Essays
946 Words
Grammar
Plagiarism
Writing
Score
Truss Bridge Design
Basic Research 1. What is a truss and how are trusses used in bridge design? Include the importance of triangular shapes in truss design.

A truss is a formation produced by triangular components. The triangular units forming the truss are slim and straight in form. The truss bridges consist of a grouping of triangles. Trusses are used in bridge design to form a series of strong supports using triangles, and have the forces of tension and compression acting on them. The importance of triangular shapes in truss design is that when a force is applied on them, they will be under both compression and tension. The forces will be spread sideways, which spreads the weight from where it is applied, to the ends of the bridge. A truss is a structural
Strength and mass are proportional, since an increased mass allows for more materials to maintain the structure. Increased supports mean that there will be more supports for the applied load. Another important relationship between strength and mass (material used), is that shorter members are less capable to compression, while longer members are better for obtaining tension.

Research of Bridge Designs Warren Truss Bridge: It is considered one of the simplest and strongest bridges. It uses equilateral triangles. The equilateral triangles minimize the forces to only tension and compression. When the load is centered in the middle of the bridge, all the forces are larger. Its advantages are that it is fairly simple, and spreads loads fairly evenly between the members. The disadvantages are that it has poorer performance under certain loads. It is best used for long span structures.

Pratt and Howe Tresses: These two bridges are very similar. The only difference is how the slanted members are angled. On the Pratt truss, the shorter, vertical members are in compression, whereas on the Howe truss, the angled members are in compression. The Pratt Truss has larger forces on the top and bottom chords than the Howe. There is a similar effect of centered and spread loads on the Howe Truss. These designs are not advantageous when the load is
As well, we learned about the pros and cons of different types of truss bridges namely the Warren truss, Pratt and Howe trusses, and the Fink truss. Additionally, it was concluded from the research that triangles will experience both tension and compression when a force is applied on them, since the triangle spreads the compression force sideways to the ends of the bridge, therefore allowing support for a maximized load. Equilateral triangles are commonly used as they minimize forces to tension and compression. From the bridge research, it was concluded that the first types of bridges such as the Warren truss and the Pratt and Howe trusses are not optimized to keep a load; this crates the decision to construct a Fink bridge. The reason for this choice is that the Fink design is with a large triangle, with numerous smaller triangles inside the large triangle for reinforcements, which signifies that the Fink design would be strong, especially if the load is applied to the middle, due to the strengths of triangles. Additionally, to further strengthen the bridge for a centered load, the bridge should have a high depth at the middle. Also, in order to ensure that the bridge spans at least 90 cm, and to add strength, it was decided that a Triple Fink bridge be constructed. Due to the triangles in the design, this is even further reinforced by the overall triangular

## You May Also Find These Documents Helpful

• Good Essays

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…

• 1508 Words
• 7 Pages
Good Essays
• Powerful Essays

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 ...................................................................................................................................…

• 3761 Words
• 146 Pages
Powerful Essays
• Good Essays

Web give the truss its strength and rigidity by transferring the stresses in the chords throughout the structure. https://nationalvetcontent.edu.au/alfresco/d/d/workspace/SpacesStore/b2f0fcee-47cb-4650-b248-f533d73d5428/13_05/toolbox13_05/unit8_laying_up_roof_trusses/section1_principles/lesson2_parts_of_a_roof_truss.htm 4. What particular feature makes a truss so strong? The feature that makes a truss so strong are the geometric principles that are used such as triangles.…

• 370 Words
• 2 Pages
Good Essays
• Good Essays

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…

• 876 Words
• 4 Pages
Good Essays
• Good Essays

Boon, G. (2008). 5 Steps to Building a Model Bridge [EBL version]. Retrieved from www.garrettsbridges.com…

• 5848 Words
• 20 Pages
Good Essays
• Better Essays

Truss bridges have many advantages that make it more useful for everyday use. The truss bridge is very economical to build and uses very few resources. It uses light materials and small loads of timber or whatever it is being made of. It is also one of the stronger bridges that can be built. The trusses on top of the bridge make it very strong because the triangle shape takes away much of the pressure and spreads the pressure to the triangles and takes it away from the road part of the bridge. The bridge is also one of the few designs that roads can be directly placed on top of. The truss bridge can also be built virtually anywhere, meaning it can be short or long and it will still be strong. It is also very easy to build. The truss…

• 680 Words
• 3 Pages
Better Essays
• Good Essays

This bridge was one of the bridges that we thought as a group that can hold the much weight because of its structures. At first it was really hard to figure out on how to build it but three minds always work better then one so as we figured out the best way to built it we would test it ourselves.…

• 443 Words
• 2 Pages
Good Essays
• Good Essays

## 5t43

• 2676 Words
• 11 Pages

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…

• 2676 Words
• 11 Pages
Good Essays
• Satisfactory Essays

In conclusion, our hypothesis which stated that the truss bridge will be the bridge with greatest weight bearing capacity was right. The truss that supported its bridge had a greater effect than an arch bridge’s arc that similarly acts like a truss.…

• 149 Words
• 1 Page
Satisfactory Essays
• Good Essays

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…

• 989 Words
• 4 Pages
Good Essays
• Satisfactory Essays

The bridge we, as a group, choose to model for this project is the Brooklyn Bridge. The Brooklyn Bridge was built by architects named John A. Roebling and Washington Roebling. John A. Roebling was born in Germany on June 12, 1806 and immigrated to America in 1831. He received a degree in civil engineering at Royal Polytechnic, in Berlin, 1826. Sadly, on construction site of the Brooklyn Bridge, due to an accident, John died, at the age of 1869. Washington Roebling was John’s son. Washington was born on May 26, 1837, in Saxonburg, Pennsylvania.He too, was an architect for the Brooklyn Bridge. Just like his father, Washington, received a degree in civil engineering at Royal Polytechnic, in Berlin, 1857. The Construction of the Brooklyn Bridge…

• 142 Words
• 1 Page
Satisfactory Essays
• Good Essays

Czaja, S. J., & Sharit, J. (2009). The Bridge. Washington, DC: National Academy of Engineering.…

• 822 Words
• 3 Pages
Good Essays
• Good Essays

Its architectural style is neo-gothic , with its characteristic pointed arches in the two lateral towers. Although at the time it was built no aerodynamic tests were carried out on the bridges (this technique only began to be used in the fifties of the twentieth century), the open structure of the bridge prevented stability problems due to the wind. In addition, Roebling had calculated that with the metallic cable supports the bridge was six times more resistant than strictly necessary, which explains why it still stands when a large part of the hanging bridges built at the same time do not…

• 549 Words
• 3 Pages
Good Essays
• Satisfactory Essays

On July 1, 1940 the Tacoma Narrows Bridge was open to traffic and was the third longest suspension bridge in the united state during the 1940 's. It had a span of 5939 feet measuring the approaches. It had two towers of 425 feet tall that were connected to the bridge. During the design they picked that it should be a suspension bridge because it was only supporting cars which were much lighter then trains. Due to only have cars on the bridge they used shallow plate girders instead of trusses because they didn 't cost as much and the bridge didn 't need to hold as weight up. The plate girders however did not allow the wind to pass through as the trusses did so it moved a lot and got the nickname of "Galloping Gertie." The bridge collapsed on November 7, 1940 due to winds plus a broken cable in the middle of the bridge which made it unbalanced. The wind would come up and under the bridge and get it in a motion where it turned one way and then bounced back and the wind would hit it there. It sent it into a twisting motion till it broke into pieces. The winds started at 35 mph that day and it was enough to get the bridge moving but then it went up to 42 mph which stayed constant for a while and broke the bridge. In 1950 they built the new Tacoma Narrows Bridge. It used truss girders this time and they also put stiffeners into the bridge so it didn 't move. The truss girders also allowed the wind to pass through so it didn…

• 471 Words
• 2 Pages
Satisfactory Essays
• Good Essays

Each structure has its own performance that qualifies it for specific tasks, for example, concrete structures have advantage x, so this construction is mainly dependent on using concrete structure because of x feature. Happho (2016) pointed out that concrete and steel structures both have advantages in overall performance that make them two of the most important structures uses in civil engineering in many types of constructions. This is valid point since these advantages allow the constructions processes much easier to be handled for instance as for concrete structures no excessive maintenance is required in comparison to steel structures and it can tolerate high temperatures from fire for a long period of time without losing structural safety while for steel structures, less time to build than concrete structure, ease to expand the structure, wide range of joining methods like bolting and welding , they are more flexible than concrete that let them to have high dynamic forces resistance like wind or earthquake forces and they can take up both compression and tension forces . On the other side in real life there is nothing is perfect so there are disadvantages in performance for both structures. According to Happho (2016) and Madsen (2005), the two structures have some disadvantages that might delay the process of the constructions. The author has a point because these…

• 1069 Words
• 5 Pages
Good Essays