7 . Problem 7B. Use the column strength interaction diagrams to design a square tied column with #9 rebars in four faces to support the loads of P. = 760 kips and M.= 240 kips-ft. The column cross section should not exceed 20" 20" due to some aesthetic considerations. The material properties are e' = 4 ksi and fy = 60 ksi. #4 ties are used as shear reinforcement and assume the spacing between the centers of rebar to the column surface is 3.0 in. Check the acceptability of your design by drawing the strength curve OM, OP, in the neighborhood of (M., P.) with at least three points. (a) Determine the dimension of the square column cross section. b=h= in (b) Compute the parameters needed to apply the column strength interaction diagram OP bh OM bh e/h= (c) The required reinforcement ratio read from interaction diagram. Pre (d) Draw the column cross section of your final design. Mark all in? necessary dimensions to show the rebar placement. A provided (e) Draw the design strength curve M, P, in the neighborhood of (M.P.) with at least three points to verify your design. =