Answer Happy

Question 3 3. a) Classify each of the following structures as: • stable or unstable, and • statically determinate or indeterminate. If indeterminate, specify the degree of indeterminacy. In each case justify the classification and comment on its significance. All members are pin-jointed at their ends. A roller pin pin Figure 3a 3. b) H 4 m Figure 3b 4m roller F 4m 200000 pin B roller 4m 15 KN 10 kN Figure 3d Determine the reactions and the force in members GF, FC and CD. State if the members are in tension or compression. All members are pin connected at their ends. 3. c) In the truss in Figure 3d, members HC and CF are to be replaced with members between nodes B - G and G-D. Using qualitative analysis, identify the nature of the internal forces (Tension, Compression or Zero Force) in each member of this new truss arrangement. Use a sketch of the truss to illustrate the nature of the internal forces. No calculations are required. pin D No joint No joint here here Figure 3c + 1.5 m 3m E roller 11 00