在解析表达式的基础上推导考虑双重效应的组合梁单元刚度矩阵。
On the basis of the solution expression, we deduce the composite beam unit stiffness matrix of the dual effects of the displacement.
板的位移函数取双重级数形式，级数的各项为梁函数的乘积。
Taking the displacement function of plates in the form of a biseries, all terms in series are given by products of functions of a beam.
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