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Popsicle Stick Bridge

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by

Nafisa M.

on 22 October 2012

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Transcript of Popsicle Stick Bridge

World's Longest, Strongest, Lightest Bridge Group Members And Their Parts Quality Control Manager Koushika Ganesilingam Fabrication Manager Rafia Mahzabin Communicator Sahifa Khan Fabricator Nafisa Mahbub Goal / Objective Identification The goal of this project is to build the WORLD's LONGEST, STRONGEST, and LIGHTEST bridge. It must be able to support a load of at least 150 lbs. Truss Bridge What is a "truss bridge?" A truss bridge is a bridge where the structure that supports the loads are beams that are connected to create a triangular unit or otherwise known as "trusses." It is a bridge whose composition is made up of numerous triangles. Benefits of A Truss Bridge A truss bridge is able to use less material but can still make a pretty strong bridge. This is because a major part of it's geometric design are triangles. As triangles are a very rigid shape, they have more strength. Forces vs Truss Bridges Two Major Forces compression tension Compression is a force that shortens or compresses an object as it bears down on it Tension is a force which lengthens or stretches an object as there are two opposing forces. Relation to Truss Truss bridges have diagonal and horizontal components (triangles). This allows there to be transfers of forces to pilings so that it can be dissipated to the Earth. Truss bridge also ensures distribution of the force to different parts of the whole structure. This means that there is no concentrated forces in one area. Examples of Truss Bridges Requirements of Building A Bridge support a 150 lbs load
- standing weight
- moving weight quality control manager must approve parts
- stringers, perimeters, and truss sections follow the basic blueprint
- bridges must be similar cooperation between team members Materials - popsicle sticks
- carpenter's glue
- paper towels
- tie members
- sand paper
- file
- blueprint Design Process Input Process Output Evaluation What is the problem? The problem is constructing a truss bridge from popsicle sticks that can hold 150 lbs. What are the available resources? We were given many resources that were meant to aid us in completing our bridge. We were given physical materials to build it, documents that gave us some basic knowledge on bridges and a clear workspace to work on. We also have access to computers to do any other research that may help us to build a good bridge. Materials Define the goal. Build a truss bridge that can hold a weight of 150 lbs. Investigate, Analyze and Understand To investigate and analyze the bridge building process we read documents provided, watched the videos on bridges, did a little research on the background of truss bridges. To understand it better, we had to be a little more hands on. We brainstormed many different ideas on how to make it stronger, more adaptable, more aesthetically pleasing, and etc. This was how we tried to be more connected and develop a better understanding of what we were doing. Select the best solution. To be able to construct a successful bridge and reach your objective, you need to find the best solution you can. Sometimes, the solution is more like a criteria you have to meet. For this particular project, our criteria was to follow the blueprint as precisely as possible, have accurate measurements and try to maintain a symmetrical look. We also tried to choose the better popsicle sticks and have an even amount of glue. These are some of the criteria we tried to follow. Create a plan and a design. Make sure that your plan and design includes a list of
resources that you require, a step-by-step process towards
completion and have a basic vision of a final product. START CONSTRUCTION! Structures built in to compose final product: - stingers
- perimeters
-trusses
- tie members Final Product Reflection on input, process, and output. Was this a suitable solution? What are the strengths? What are the weaknesses? What can we improve? Fabrication Process Stringers
(required: 3 top & bottom) - place a dummy on top of a popsicle stick as exact as possible
- binder clip the dummy to make it easier
- to the side without the dummy spread the glue (as evenly as you can)
- place another popsicle stick on the glue
- binder clip the popsicle sticks together
- release the binder clip from the dummy and remove it
- any excess glue should be wiped off with a paper towel
- top stringers
- continue this process until you have 4 popsicle sticks on bottom and 3 on top
- bottom stringers
- continue this process until you have 3 popsicle sticks on bottom and 2 on top Perimeters
(required: 3 perimeters) - place a top/small stringer on the shorter side of the diagonal between the screws
- place a bottom/big stringer on the longer side of the diagonal between the screws
- get a screw driver and tighten the screws
- pick up two separate popsicle stick
- apply glue to the top and bottom
- place them against the side of the diagonal, on the stringers
- do the same on the other sides
- binder clip the parts with glue
- any excess glue should be wiped off with a paper towel Trusses - place the perimeter on to the blueprint
- ready eight more popsicle sticks
- place them onto perimeter where indicated by blueprint
- remember to keep a 1/4 inch gap between popsicle sticks
- glue them onto the perimeter
- binder clip the trusses to the perimeter
- any excess glue should be wiped off with a paper towl
- do this for all three perimeters Tie Members - make sure you have 6 tie members
- 3 on top and 3 on bottom
- mark the location of where you will place tie members (between tie members for top)
- top and bottom should be exactly straight down
- make sure the top stringers are facing the ceiling
- glue the top tie member to the top stringer
- any excess glue should be wiped off with a paper towel
- wait for the glue to dry
- flip the bridge so bottom stringers are facing the ceiling
- glue the tie members to the marked locations
- any excess glue should be wiped off with a paper towl
- wait for the glue to dry Doubled Xs - from one corner of the bottom stringer to the top corner of a top stringer glue a popsicle stick
- get another popsicle stick and do the same thing on the opposite side
- binder clip the two sticks
- any excess glue should be wiped off with a paper towel
- wait for the glue to dry 
- double the the popsicle sticks
- continue for each pair of tie members Successes and Improvements
for the Group Successes We had a lot of successes while constructing our bridge.
We put extra supports by doubling the trusses and putting the doubled Xs. This made it stronger and more like to be able to withstand the forces of the load. Our bridges were also quite stable because the measurements were pretty accurate and it was as symmetrical as we could have made it. These are some of the things we were successful in during the construction of our bridge. Improvement There are many improvements that we should make the next time we make a bridge to make it even better than our first. For one, there should have been way more teamwork then there was this time. We weren't coordinating properly and had a hard time understanding what each of us were supposed to do. We should also try to have better time management the next time. We have to organize what we are doing, how we are doing, and the time it will take to accomplish that task. Lastly, we should try to create a more structured plan to keep us on the right track. These are some of the improvements we should make. Video Little Belt Bridge Parts of A Truss Bridge Types of Trusses Truss bridges also have a pretty large span compared to other bridges. This is mostly because the truss bridge has many supports that help make the bridge tougher. The truss bridge is an extremely sturdy bridge. Evidence of that is how it is able to stand small cracks for sometime when it is supporting a heavy load before breaking. That is why this bridge can hold its own. The structure of the truss bridge enables it to have an equal weight distribution. This means that one area isn't required to stand concentrated force because it is instead spread throughout the entire bridge. A characteristic like this makes this bridge quite efficient. Thank you for watching! An example of the step-by-step process would be:
1. Build the stringers. (3 top and 3 bottom stringers)
2. Get stringers approved by quality control manager.
3. Build the 3 perimeters.
4. Get perimeters approved by quality control manager.
5. Add the trusses.
6. Get the trusses approved by quality control manager.
7. Double the trusses.
8. Get them approved by quality control manager.
9. Connect the 3 parts of the bridge using the tie members.
10. Get it approved by quality control manager.
11. Add the double Xs.
12. Get it approved by quality control manager.
13. Test out your bridge!

(Remember to follow the fabrication plan for each of the parts of the bridge, record in your daily log and do your job for your group whether you are the quality control manager, fabrication manager, communicator or fabricator.)
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