列式法求解切线刚度矩阵来考虑几何非线性。

For geometrical nonlinearity, Updated Lagrangian formulations are adopted to derive the tangent stiffness matrix.

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其次，基于CR列式法推导出了大旋转小应变空间杆单元及平面梁单元的内力矢量及切线刚度矩阵；

Then, based on the CR formulation, the internal force vector and tangent stiffness matrix of large rotation and small strain space bar and plane beam element are deduced.

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