Cho một cột siêu tĩnh, 2 đầu liên kết ngầm tiết diện chữ nhật b=40cm, h=60cm. Cột chịu cặp nội lực M=220kNm, N=850kN. Cho biết : cột làm bằng bê tông có cấp độ bền chịu nén B15 cột thép C11 . Hệ số uốn dọc n=1,2 . Hệ số điều kiện làm việc yb3=0.85 L=5(m) ó cap He sô ion ban chui hon Bás , côt. thep CI 5(m) yeu cau - tính toán cốt thép đối xứng cho cột

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