Class Activity 2 - Truss_SkyCiv

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School

University Of Georgia *

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Course

2110

Subject

Mechanical Engineering

Date

Apr 3, 2024

Type

docx

Pages

4

Uploaded by Adyjannu

Group Activity Workshop – 2D Truss Purpose 1. Practice to draw free-body diagram to describe 2D systems (CO #e) 2. Practice to solve 2D and 3D equilibrium systems (CO #f) 3. Practice to analyze simple trusses using method of joints and method of section (CO #g) 4. Practice to use appropriate mathematical, sketching, and modeling skills to describe concepts and systems (ABET #1) Tasks Please see the group that you have been assigned to on eLC. Discuss and solve following truss problems. Use sketches and diagrams to support your answers. Part A – Observe the symmetry! (10 points) A 2D truss system below has 5 elements and 4 joints. The truss system is roller supported at joint 1 and pin supported at joint 3. Calculate all member forces of the truss system using the method of joints ! Discuss your results! Assume a = 20 ft and P = 8 kips. Perform your calculations on a blank paper using the Given, Find, and Analyze layout. 2 @ a a 1 2 3 4 1 2 3 4 5 P x y Figure 1 Simple 2D truss structure (5 elements, 4 joints) Page 1 of 4
Part B – Build your analytical skills! (10 points) Some members are now added to the 2D truss system above to build a bridge structure as shown below. Note that the structure is symmetric about a line passing through nodes 3 and 7. Two-point loads P are applied to the bridge at joint 2 and 3. Calculate member forces 2, 3, 12 and 13 using the method of sections ! Discuss your results! Assume a = 20 ft and P = 8 kips. Perform your calculations on a blank paper using the Given, Find, and Analyze layout. 4 @ a a 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 9 10 11 12 13 x P P x y Figure 2 2D truss structure (13 elements, 8 joints) Page 2 of 4
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