Second Ave. Bridge over I-94

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1 Name: Hour: Date: Transforming Detroit: Cost-Efficient Bridges Part 1: Identify the Problem Second Ave. Bridge over I-94 Your Task Working with your partner, design and build a prototype for the Second Ave. Bridge over I-94 that is cost-efficient and can safely maintain a load. The goal of your prototype is to have the largest mass to cost ratio. It is suggested that you and your partner split this task into two roles, and, at the same time, support each other in the entire process: The Construction Company CEO/Accountant will make sure that the prototype gets built, and will keep track of spending. The Engineer/Architect will make sure the bridge is safe, and will select the materials to be used. Design Constraints The prototype may only be built from provided materials. The prototype must be freestanding (i.e. not taped to the surface of an object). The prototype must include a deck. The prototype s substructure must be a minimum of 5 centimeters in height. The prototype must be 15 centimeters (cm) in length. The prototype must be wide enough to hold a Dixie cup. A "car" must be able to drive under your prototype Part 2: Research On your own, research bridge design using the resources provided. As you research, keep in mind the restrictions and your overall goal (cost effective and safe). Part 3: Imagine Possible Ideas (DESIGN) On your own, come up with possible designs for your bridge using the research you have done. Keep in mind your restrictions and materials (see order form section). Draw your ideas on your research document. Labs and Projects

2 Part 4: Choose a Solution With your partner, design your final prototype on graph paper provided. Use the design checklist to evaluate your design. Label each part of the design with the potential materials you will use. Materials available are listed in the order form section. Glue your design on the next page. Design Checklist o Top view of design o Side view of design o Substructure included o Deck included o Neat o Labeled with materials to be used o Takes up the majority of the graph paper o Labels for desired measurements (metric units) o Total length o Total width o Total height o Design is glued to this page Labs and Projects 2

3 Order Form Use your design to complete the order form below. Prototype Supplies Order Form Item Quantity Price Thin beam (toothpick or skewer) 2 toothpicks for $1 or $5 for skewer Wide beam (straw) -- $2 each Extra wide beam (popsicle stick)-- $3 each Liquid Nails Adhesive (tape) -- $1 for 10 cm Cable (thin wire) -- $20 for 10 cm Rod (paper Clip) -- $5 per clip Filler metal (hot glue) -- $40 per stick Welding machine rental fee (hot glue gun) -- $50 for unlimited use Grand Total Part 5: Create and Test Prototype When you have completed your design and order form, bring them to the lead contractor for approval. Once you have obtained the contractor s stamp of approval, you will receive the materials you have ordered and may begin building. Stamp Part 6: Improve After preliminary testing, feel free to modify your design/structure to help improve its cost and/or the amount of weight it can hold. Write about any improvement you made below: Labs and Projects 3

4 Communication Final Testing On the line below, write the greatest mass the prototype was able to sustain prior to breaking. Remember your unit of measure. Efficiency Ratio The city of Detroit is looking for the most cost-efficient bridges to replace those that are structurally unsound. To determine whether your design might support the city in creating structurally sound and safe bridges, determine the mass to cost ratio of your prototype. Then, simplify your ratio. Group Comparison : (actual) : (simplified) As instructed by the lead contractor, complete the data table below. Names Efficiency Ratio Brief Description of Bridge Features Recommendations Which prototype would you recommend to the city of Detroit, and why? Reminder: The city is looking for the most cost-efficient bridge to safely support a large load. Support your recommendation with data from the group comparison table and provide specific details (for example, design features) for your reasoning. Labs and Projects 4

5 Name: Date: Hr: Transforming Detroit: Cost-Efficient Bridges Project Requirements Requirements Points I will show that I have met the requirements of this project by Identify the design problem and its solution Meet the design criteria and constraints Evaluate competing designs Finish by the due date Work in a team and stay focused o Identifying the engineering problem and its possible solution o Describing the reasons why a solution for the problem is necessary o Recognizing the financial limitations related to the problem o Using evidence from the provided article and graph to identify the problem and possible solution o Using complete sentences while writing about the problem and possible solution o Drawing a final solution that includes all the criteria from the design checklist o Drawing a final solution that shows evidence of research o Accurately completing the order form o Using only the provided materials when building prototype o Building a prototype with a relatively low cost and that appears to be safe for public use o Building a freestanding prototype that will allow cars to drive underneath o Building a prototype that has a deck (which recognizes need for pedestrian walkways) and substructure o Building a prototype that meets all of the design constraints o Recording the final mass our prototype was able to hold o Accurately calculating the actual and simplified efficiency ratios of our prototype o Accurately completing the Group Comparison Table o Writing a detailed recommendation that is supported by data and that uses complete sentences o Finishing prototype by the time official testing begins o Building a prototype that requires no immediate improvements due to not meeting the size constraints o Turning in my project documents early or on time o Significantly contributed to the project by staying on task and staying with my group; no redirection needed from teacher or group members o Maintaining a positive attitude, kind tone-of-voice, and appropriate language o Honoring, following, and reminding others of our group rules o Showing respect and responsibility at all times during the project o Treating others in a manner that showed I valued our working relationship Labs and Projects