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Where do they get their I value from? In their answer they use: r = 2.66 in A = 166 in^2 Which implies I = 1139 in^4 But the section dimensions they use give I = 1324 in^4 (48*7.625^3 - 40*5.125^ 3)/12 And neither value matches up with the properties in the MDG (4) - did the MDG values change?

I'm working through the NCEES SE sample questions book and one of the questions (Q133 in the AM section) is on masonry walls, and I can't work out how they get their values in the solutions. Wall = 8" thick, reinforced at 48" O.C. The NCEES solutions use the following: Area = 161 in^2...