The box section shown in Figure 1 has a central void that is 12 in. wide x 20 in. deep. fe fr = 3,200 psi = 60,000 psi b= b = 24 in. h A = 32 in. = 6 #10 bars 164 b) Determine the nominal moment strength (M.). +6+ 20" 32" Figure 1: Typical Beam Section The following items need to be calculated to determine the design moment strength of the section: a) Determine if the depth of the compression block (a) is smaller than the top flange thickness of 6 inches. If the depth of the compression block is larger than the top flange thickness of 6 inches, determine a. (10 Points) (18 Points) c) Determine & the strength reduction factor and the design moment strength (M) of the section. (10 Points) d) Determine the minimum and maximum areas of tensile reinforcement (Amin and Amar) for this section. (12 Points)