Basically, neglecting azial deformations corresponds to the omission of rows 1 and 4 and columns 1 and 4 of the stiffness matrix equation (15.1) .

• 忽略不计轴向变形基本上可以说相当于删去方程（15-1）中刚度矩阵的第1行和第4行及第1列和第4列。