抄録
This study intends for some large structure which have no common structure rules on the initial design stage. Therefore, it is necessary to perform a detailed stress evaluation by FEM (finite element method) for each design proposal. However, the creation of a detailed model with fine element size in the initial design stage is difficult. In addition, there is a problem that it takes lot of time to create a design proposal. In short, because the results of FEM depend on the size of the element, it is necessary to evaluate the error in these analyses. Then, this study aims to evaluate the error and recover the stress for FEM at the initial design stage. In this study, the two methods of stress recovery for a model with regular element shape were proposed. First, it is the technique for obtaining stress using the element force of an adjacent element. When this technique was used for a model with large element size, it turned out that stress distribution is equivalent to a detailed model with fine element size except a joint of each structural component. Second, it is the technique for obtaining stress using the element force based on the quantity gap of the element force between adjacent elements. The influence from each structural component in a joint can be taken into consideration by using this technique. When this technique was used for a model with large element size, it turned out that stress at each structural component in a joint is equivalent to a detailed model.
