Answer Happy

Question 4 (25 Marks) A U-shaped steel frame ABCDE is simply supported at A and E and loaded by opposing forces F at points B and D, as shown in Figure 2. (a). Why is this problem statically indeterminate? (5 Marks) (b). Making use of symmetry, how can the Unit Load energy method be employed to determine the vertical deflection of point A, assuming this point has been temporarily released? (10 Marks) (c). If the radius of curvature of the semi-circular arc, R = L, as shown in Figure 2, use the Unit Load method to prove that the vertical reaction force at A is given by RA = 0.565 F. (10 Marks) Hint: when carrying out the calculation you may assume that ſ sin 1 sin2x = x 2 = 2 (v - zsin 2x) 1 2
L L F A B R = L с D ololo O E F L L