The uniform sign has a weight of 1580 lb and is supported by the pipe AB, which has an inner radius of 2.75 in. and an outer radius of 3.00 in. If the face of the sign is subjected to a uniform pressure of a = 164 lb/ft2, determine the state of stress at points C and D. The sign has a width of 11.3 ft. Neglect the thickness of the sign, and assume that it is supported along the outside edge of the pipe.