1. ENGR 34 Chapter 6, Day 3 3D Trusses & Frames
ENGR 34 Statics Chapter 6, Day D Trusses
ENGR Chapter 6, Day 3 3D Trusses & Frames
3D trusses
Constraints & rigidity
More 3D RB equilibrium practice

2. ENGR 34 Statics Chapter 6, Day 3 3D Trusses
3D Truss Analysis
All connections assumed ball and socket
All forces at joints
Each joint is 3D point FBD
2 J = M + R ?????
Tetrahedrons are strongest

3. ENGR 34 Statics Chapter 6, Day 3 3D Trusses
3D Truss Analysis
All connections assumed ball and socket
All forces at joints
Each joint is 3D point FBD
3 J = M + R
Tetrahedrons are strongest

4. ENGR 34 Statics Chapter 6, Day 3 3D Trusses
Non Rigid Trusses
Extra reactions may help

5. ENGR 34 Statics Chapter 6, Day 3 3D Trusses
3D Zero Force Bodies
A joint with one member not in a common plane.

6. ENGR 34 Statics Chapter 6, Day 3 3D Trusses
3D Trusses Key Concepts
3 J = M +R
Joint method preferred
Assume Tension