其中几何刚度矩阵由轴向力、双向弯曲和截面翘曲的影响组成。
The geometric stiffness matrix is composed by the effect of axial force, bending moment and bimoment.
所得到的刚度矩阵表明，只有当忽略翘曲变形对截面转角的影响时，轴向拉压才只与水平弯曲及竖向弯曲相耦合，而与约束扭转不再耦合。
It is shown that, when the effect of warping on rotation Angle is neglected, tension (or compression) is only coupled with horizontal bending and vertical bending instead of constrained torsion.
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