通过修正常应变矩阵，确保单元通过分片检验。
To pass the patch test, the constant strain matrix is modified.
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.
精化杂交法可以使单元的应变能按假定的应变模式分解，由此得到相应的分解的单元刚度矩阵，而且常常可以推出显式。
By this way the element stiffness matrix can be decomposed into a series of matrices with respect to assumed strain modes.
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