Truss Design Challenge Experiment - Group 4

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Experiment Description: Students in the lab were tasked with designing a truss or bridge to span 400 mm and withstand a 100 lb load in a four-point flexure test. The requirements for the bridge are as follows: • Span length of 400 mm • Width of 75 mm • Maximum height of 75 mm • Maximum weight of 100 grams • Must support 45 kg (100 lbs) • No adhesives, such as glue, were allowed for connections The challenge for students was designing bridges that could be printed in separate parts due to their large size. Students had to design connections without using adhesives, which is crucial since connections are the weakest points on trusses. Group 4's Bridge Design: Group 4 designed their own truss inspired by the Warren and Howe truss. Their design featured seven complex and aesthetically pleasing parts with a total weight of 85 grams and a load resistance of 60 lbs. However, the bridge failed due to its tall midsection, causing it to overturn laterally during testing. The group suggested increasing the thickness of members at midspan or shortening the height of the midspan to improve their design. Note: A handout for this experiment will be available soon, and a link will be provided when complete, allowing you to perform the experiment with your students.