Determines the type definition that this derived element is based upon.
确定此派生元素所基于的类型定义。
It is exposed so that derived element classes can make further checks on their own possibly invalid layout state.
公开此方法以便派生元素类可以对其自身可能的无效布局状态进行进一步的检查。
Having introduced the eccentric space thin-walled girder and the space combined cable elements, the author has derived element elastic stiffness matrix, geometric stiffness and masse matrix.
引入偏心空间薄壁梁单元及空间组合索单元，导出弹性刚度阵、几何刚度阵、质量阵。拉索张力随垂度变化的非线性由等效几何刚度计入。
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