10/16
Discussed each other's responsibility for the project (and blog), as well as ideas for constructing an efficient bridge model. We have selected between two bridge designs: Pratt Truss and Warrent Trust, but not quite sure which model is better. Did some research about about Bridge structure
"The Pratt Truss was designed by Thomas and Caleb Pratt in 1844. It became popular for railway bridges because it made good use of iron. The Pratt has many variations, most with their own unique name. For instance, the Baltimore, Pennsylvania, and the Parker are all based off the Pratt."
Pratt Truss structure
http://www.garrettsbridges.com/design/pratt-truss/
10/19
Finished working on the proposal, and updated the blog with team info. Collaborated about our step-by-step process on designing the bridge. Come up with a detailed sketch of the Pratt Truss structure for the model bridge.
10/23
Group meeting in Bossone to continue discussion about the project. Began to download and learned how to use Visual Analysis for design of the bridge and have our model bridge sketch om Visual Analysis.
-We have problem in rotating the bridge on Visual Analysis and got help from advisor.
- We also learned that material will not affect the result in Visual Analysis. It tells the force can be applied due to the geometry of the model bridge.
- Also gathered some material like Gorilla Glue and Popsicle sticks to test the materials.
10/30
Working with Visual Analysis for the bridge by testing the design to see how much force is applied to each member. Completed teamwork assessment 1.
- The result from Visual Analysis shows that the center of the structure will load the most of weigh and the force is stretched and spread evenly both side of the bridge. We can see the amount of force is applied to each member when we put a 100lbs weight to the center of the bridge.
Discussed each other's responsibility for the project (and blog), as well as ideas for constructing an efficient bridge model. We have selected between two bridge designs: Pratt Truss and Warrent Trust, but not quite sure which model is better. Did some research about about Bridge structure
"The Pratt Truss was designed by Thomas and Caleb Pratt in 1844. It became popular for railway bridges because it made good use of iron. The Pratt has many variations, most with their own unique name. For instance, the Baltimore, Pennsylvania, and the Parker are all based off the Pratt."
Pratt Truss structure
http://www.garrettsbridges.com/design/pratt-truss/
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10/19
Finished working on the proposal, and updated the blog with team info. Collaborated about our step-by-step process on designing the bridge. Come up with a detailed sketch of the Pratt Truss structure for the model bridge.
Detailed sketch of Pratt truss structure.
- Our Pratt Truss model bridge will have six members, three on each side and they are symmetrical through a center point like the picture above. This symmetric structure will help the model hold the most efficient weigh on the center of the bridge.
-Arranged next meeting on Friday to try and gather materials of designing the bridge.
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10/23
Group meeting in Bossone to continue discussion about the project. Began to download and learned how to use Visual Analysis for design of the bridge and have our model bridge sketch om Visual Analysis.
-We have problem in rotating the bridge on Visual Analysis and got help from advisor.
- We also learned that material will not affect the result in Visual Analysis. It tells the force can be applied due to the geometry of the model bridge.
- Also gathered some material like Gorilla Glue and Popsicle sticks to test the materials.
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| Input value of beam from paper sketch to Visual Analysis. |
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| Follow tutorial to learn how to modify the force applied on the Pratt Truss structure. |
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Working with Visual Analysis for the bridge by testing the design to see how much force is applied to each member. Completed teamwork assessment 1.
- The result from Visual Analysis shows that the center of the structure will load the most of weigh and the force is stretched and spread evenly both side of the bridge. We can see the amount of force is applied to each member when we put a 100lbs weight to the center of the bridge.
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11/2
Start physically building both sides of the bridge using Popsicle sticks and gorilla glue.
- We made a 3 layers Popsicle sticks on each horizontal edge.
- The first layer is made so that the Popsicle stick on top will be glue to hold the connection of 2 Popsicles stick on its bottom.
- Then we add the vertical and diagonal sticks along the two edges of the first horizontal layer.
- Then second horizontal layer will be added to complete each side of the model bridge.
2 sides of our model bridge.
- The problem we had is it was very difficult to maintain all horizontal Popsicle sticks straight. We used card board as a frame to shape it straight. However one side is still a little bit tilt ( the top part on the picture). This can be recorded as a source of error of the final result.
Working on the Final report. Each member was assigned a section to the final report for completion.
- Abtract and Introduction: Bob, Technical activity: Ngoc, Result, conclusion and reference: Ribul and Mohamad, Peter will maintain and update the blog.
- Review the comment on the proposal and meet with advisor for some suggestion in revise the report.
11/13
Joining the two sides by gluing the top.
- The problem we had is the joint point of 2 side is not flat. So we also had to use shave the Popsicle sticks to make the bridge flat at the joints.
- We have two members holding the side on both ends and one person will put the top on and glue it. In fact, it was very difficult to hold the 2 side horizontally and parallel while gluing the top.
- The result is the bridge is not perfectly even. However, we sill let it dry out and then we are going to test it next week.
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11/20
After the top part is dry from last week, we figure out that the two sides that were not perfectly parallel results to a severely uneven bridge. We decided to take it apart and redo it again in a more accurate way.
- We used two cushions as a frame for the sides to lean in, so that they will stand straight and parallel
- We used duck tape to tape each side of the model bridge to the cushion' edge. Then set the two cushion parallel to each other and at a distance of the length of a Popsicle sticks
- Make sure the sides are vertical with the ground and parallel with each other, then we put the top popsicle stick on top at the joint points.
- We glued Popsicle sticks on top parallel with each other, then connect them with diagonal sticks.
- Let the glue dry for an hour and a half to make sure the shape of the bridge is set, then we untape the bridge from the cushion frame.
- The uneven problem is solved, and our bridge looks very even.
Start physically building both sides of the bridge using Popsicle sticks and gorilla glue.
- We made a 3 layers Popsicle sticks on each horizontal edge.
- The first layer is made so that the Popsicle stick on top will be glue to hold the connection of 2 Popsicles stick on its bottom.
- Then we add the vertical and diagonal sticks along the two edges of the first horizontal layer.
- Then second horizontal layer will be added to complete each side of the model bridge.
- The problem we had is it was very difficult to maintain all horizontal Popsicle sticks straight. We used card board as a frame to shape it straight. However one side is still a little bit tilt ( the top part on the picture). This can be recorded as a source of error of the final result.
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11/9Working on the Final report. Each member was assigned a section to the final report for completion.
- Abtract and Introduction: Bob, Technical activity: Ngoc, Result, conclusion and reference: Ribul and Mohamad, Peter will maintain and update the blog.
- Review the comment on the proposal and meet with advisor for some suggestion in revise the report.
---------------------------------
11/13
Joining the two sides by gluing the top.
- The problem we had is the joint point of 2 side is not flat. So we also had to use shave the Popsicle sticks to make the bridge flat at the joints.
- We have two members holding the side on both ends and one person will put the top on and glue it. In fact, it was very difficult to hold the 2 side horizontally and parallel while gluing the top.
- The result is the bridge is not perfectly even. However, we sill let it dry out and then we are going to test it next week.
 | |
| Gluing the top to attach 2 sides of Model Bridge. |
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11/20
After the top part is dry from last week, we figure out that the two sides that were not perfectly parallel results to a severely uneven bridge. We decided to take it apart and redo it again in a more accurate way.
- We used two cushions as a frame for the sides to lean in, so that they will stand straight and parallel
- We used duck tape to tape each side of the model bridge to the cushion' edge. Then set the two cushion parallel to each other and at a distance of the length of a Popsicle sticks
- Make sure the sides are vertical with the ground and parallel with each other, then we put the top popsicle stick on top at the joint points.
- We glued Popsicle sticks on top parallel with each other, then connect them with diagonal sticks.
- Let the glue dry for an hour and a half to make sure the shape of the bridge is set, then we untape the bridge from the cushion frame.
- The uneven problem is solved, and our bridge looks very even.
The bridge is taped to cushions for evenly parallel position.
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11/ 23
- Add diagonal crossing sticks on both ends and the center of the model bridge to increase the support for the horizontal surface. After glue them, we used duck tape to make sure they are hold in the right position while drying as they might fall out.
- We also add Popsicle sticks across the bottom part of the bridge to completely finish building the model bridge.
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| Adding bottom part to complete the model bridge. |
11/30
- We met at the gym to test the bridge. We used the weights to test that. First, we started by putting 45 lbs, then 25 lbs, then 10 lbs, then 10 lbs, and finally 10 lbs. It all summed up to be 100 lbs and the bridge was still holding. We took a video of that which is attached here.
- We met at the gym to test the bridge. We used the weights to test that. First, we started by putting 45 lbs, then 25 lbs, then 10 lbs, then 10 lbs, and finally 10 lbs. It all summed up to be 100 lbs and the bridge was still holding. We took a video of that which is attached here.
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