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MARKS QUESTIONS 5. a) Calculate the reactions of the three-pinned arch shown in Figure 5a С Pixy) h R Run 7771 RAV Raw U2 12 Figure 5a 7 9 5. b) Show that for an arch supporting a uniformly distributed load the funicular shape is parabolic. 5.c) 12kN/m y w D Pixy 10 m 6 m B RAH ROH RAV Pay 24 m Figure 5b (1) The arch shown in Figure 5b is described by the equation y = 20 x?and supports a uniformly distributed load of 126Nm. Calculate the value of shear, compression and bending moment at a quarter point (Point D) along the arch Note that the slope of the arch to the horizontal at Point Dis 39.8° Comment on the change in the magnitude of the maximum bending moment if a simply supported beam were used to support the uniformly distributed load over the 24m span. (11) 9