The table below contains the information about the cross - section. If the .formation width is 10 m, find the area of the cross - section Cross - section L CL R С 3.05 C 3.65 C 2.45 С 2.95 С 2.65 С 3.45 11.10 7.30 3.5 8.6 11.8

Figure Q3 shows an overhead crane truss supported by pin and roller supports at point A and E. The truss is subjected to forces of 20 kN, 30kN and 20 KN acted at joint G, H and I, respectively. The cross-section area for the truss member is 2000 mm? and the Young's Modulus for all truss members is 250 kN/mm?. As a structural engineer, you are responsible to ensure the overhead crane truss is safe during maintenance works. Therefore, the crane is additionally supported by roller support at joint C. Calculate reaction, R. at support C (assume the unit load acting downward)? (a) (b) How do you present the new data on internal force for member BC when overhead crane has additional roller support at Joint C?

Must be solved using Castigliano's theorem