This class activity involves an in-depth analysis of the space truss problem as part of the Structural Analysis and Design course curriculum. Students actively participate by constructing the space truss during class sessions, which serves as a hands-on preparatory exercise before they proceed to analyze its structural properties and behavior. This practical approach not only enhances their understanding of theoretical concepts but also reinforces their learning through direct application and experimentation within the classroom setting.

Truss members - regular spaghetti/popsicle sticks. Joints - hot glue/styrofoam balls/clay

This project aims to integrate the 3Cs framework (Curiosity, Connections, and Creating Value) into structural engineering courses such as Mechanics of Materials and Structural Analysis. This hands-on learning approach involves constructing a space truss using affordable materials. The exercise enhances students' curiosity by engaging them in exploring structural concepts through physical construction and promotes connections by requiring students to apply theoretical knowledge of 3D vectors to real-world engineering challenges. Additionally, the project encourages creating value by fostering skills in practical problem-solving and structural analysis, preparing students to tackle complex engineering problems effectively. For detailed instructions, please refer to the attached handout.

Project’s Steps:

Step 1.

Exploration and Reflection (5 minutes): Students are asked to begin by reflecting on common materials and structures used in truss constructions. They are asked to sketch a space truss, fostering curiosity about structural design and making connections to real-world applications.

Step 2.

Assembly of 3D Structure (15 minutes): In groups of two or three, students translate their theoretical knowledge of structural design into practical construction using provided materials. This hands-on activity promotes making connections between theoretical concepts and practical implementation while also emphasizing the creation of value through the physical realization of their designs.

As for this problem, the scale and accurate orientation are ignored (but it would be great to implement that in your class). This is a great opportunity to encourage students to ponder how changing the scale and force orientation will change the behavior of the truss.

Step 3. 

Analytical Analysis (30 minutes): Students are tasked with analyzing the space truss using either the method of sections or the method of joints to determine the forces within the members under specified loading conditions. This step encourages making connections between theoretical analysis and real-world applications of structural engineering principles. Additionally, students are prompted to reflect on whether different analysis methods yield different results, fostering curiosity about structural analysis techniques.

Note: In the long term, measuring the force member while loading (whether tension or compression) will have a high impact. 

Step 4.

Final Safety Check (5 minutes): Students are asked to examine their construction for potential structural damage or weaknesses, fostering a mindset of exploration and inquiry into their design's robustness. This step also promotes connections by linking theoretical knowledge of structural principles with practical considerations of material strength and stability, encouraging students to apply their learning in a real-world context. Additionally, it emphasizes creating value by prioritizing safety and functionality in their design, underscoring the importance of producing structurally sound constructions that meet engineering standards and user expectations.

Note:

1. Encourage students to check if they expect any damage when the strength of a material is known.

2. Provide constructive feedback so that the students understand that design is mostly an iterative process. This reinforces the value of continuous improvement and real-world practices.