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二、試檢核圖示鋼筋混凝土柱斷面是否能承受設計載重Mu = 69 tf-m及Pu = 196 tf。（25 分）已知條件：fc’ = 280 kgf/cm2, fy = 4200 kgf/cm2D13 鋼筋，db = 1.27 cm, as = 1.27 cm2；D25 鋼筋，db = 2.54 cm, as = 5.07 cm2

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