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X = ∑(Xi.E.Ixi)/∑(E.Ixi)Công thức trên xác định dựa trên tính chất phân phối tải trọng ngang tỉ lệ thuận với độ cứng đối với các cấu kiện biến dạng đồng điệu.
Y = ∑(Yi.E.Iyi)/∑(E.Iyi)
Hình 1: Xác định vị trí tâm cứng theo định nghĩa
X = ∑(Xi.mi)/∑(mi) và Y = ∑(Yi.mi)/∑(mi).
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