A Bridge to Somewhere
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Transcript of A Bridge to Somewhere
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A Bridge to Somewhere
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Your taskYou are a member of small company that is competing against other regional companies for the right to build a cement based bridge span for a pedestrian walkway over a creek on your school campus.
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Outcomes of project
• You will construct a bid using resources available to you in the classroom.
• Your bid must include time and cost of materials that you use in your bridge/span
• Your final submission to be considered for the winning bid will cover a 2ft span and support 30 pounds. You must submit your bid with your structure.
• The winning bridge/span will be one that is the most cost effective and meets specifications.
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Requirements
• Each team must construct a minimum of 3 separate spans.
• For each span, your must include:a. Materials (type and quantity)b. Cost & Timec. Data (stress test, weight of span, other
structural observations)d. Visual representation of datae. Summary evaluation of each separate span
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Prior Teaching
Safety: Proper use PPE’sVocabulary:CompositeTension StressStrainDistortionBidEngineering
Prior knowledge:Principles of material science, characteristics of concrete, uses of concrete
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Young’s Modulus
• Definition: How much something is going to stretch
• It was very difficult to measure in this lab!• The control and burlap did not flex at all.• The welding rods flexed, but when do you
measure?
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Bridge Designs
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Discussion Questions
• How does the design of the bridge affect the load carrying capacity?
• How does the distance of the span affect the engineering of the bridge?
• What might cause a bridge to fail?• How does the design of the bridge affect the
materials used in the making of the bridge?
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Teacher Resources
• http://elearning.vtu.ac.in/16/ENotes/ConcreteTechnology/Unit5-NS.pdf
• http://www.cee.mtu.edu/~llsutter/classes/cet1141/pdf/mca1.pdf