The Redundant Truss Apparatus is constructed with units of basic triangular pin-jointed. At joint 1, it is fixed firmly due to a support. At joint 2, it is fixed to a movable support. Suppose at joint 4, $F = 250N$ Q1) Using pin-jointed Theory, show the full working to calculate theoretical member forces for the framework. For qn1, I am able to obtain the magnitude of the forces for each members using free body diagrams. A small part of my calculation based on free-body diagram is at joint 4 $$\frac{1}{\sqrt2}F_7 - F = 0$$ $$F_7 = 250\sqrt2 N$$ Q2) From your results and the theoretical member forces, identify which members are in compression and which are in tension. Explain your choices. Even if I answer qns 1 correctly, I have no idea how to explain why some of them experience compression while some experience tension. Q3) Explain the reading of member 5. While I understand that member 5 does not apply any force, I have no idea how to explain it. Login To add answer/comment