( a) The three-hinged arch shown in Figure P8.22 has a parabolic profile. Draw the influen...

( a) The three-hinged arch shown in Figure P8.22 has a parabolic profile. Draw the influence lines for both the horizontal and vertical reactions at A and the moment at D. ( b) Compute the horizontal and vertical reactions at support A if the arch is loaded by a uniform load of 10 kN/m. (c) Compute the maximum moment at point D.