The resultant compressive force on the concrete section is 179.409 กก. and is located 306.8−250=56.8 mm above the centroidal axis. This is statically equivalent to an axial compressive force of 179,409 กก (applied at the centroid) plus a moment Mub=(179,409 x 5.68)x100 = 10,190 กก-ม