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Question 1 (Design a spiral column) Which has to resist an ultimate and ultimate bending moment of 25 tons and 15 tons.m, respectively. The cross-section of this column is given to be 250 mm × 350 mm, where d and d' are 300 mm and 50 mm, respectively. Material properties of both concrete and steel rebars are listed in Table 1.1 only a rebar diameter of 25 mm is allowed for the reinforcing bars in this column. Table 1.1 Material properties of concrete and rebar fé 280 ksc fy 4,000 ksc E₂ 2.04×106 ksc Fis