特殊型式梁的子结构建模方法

针对带孔横梁刚架，提出了利用子结构法建立其有限元模型的方法。介绍了子结构分割、离散、边界自由度定义及缩减模型的形成，并根据和标准梁单元连接的位移协调要求，将子结构缩减模型转换为和标准梁单元自由度数量和性质相同的特殊梁单元，以实现不同梁单元的混合建模。子结构方法可使刚架的有限元模型建立和计算大大简化。

Substructure Modeling Method for A Special Kind of Beam

With a special kind of beam with two holes, a substructure method for creation of its finite element model is presented in this paper. The division and discretion of the substructure, the definition of boundary freedom and the forming of reduced model are introduced. According to the requirement of displacement coordination when linking with general beam element, the reduced model is transformed into a special kind of beam element, which has the same number of nodes and the same property of node freedom with general beam element. The substructure modeling method can simplify the model and its calculation greatly.