The finite element analysis model of truss structures was built, in which the structural physical parameters, geometrical dimensions and the applied loads were all considered as unascertained variables. And a structure analysis method based on the unascertained factor method was given. By the mathematics expression of unascertained factor and the arithmetic operation rules of unascertained rational numbers, the computational expressions of the structural displacement response and the... The finite element analysis model of truss structures was built, in which the structural physical parameters, geometrical dimensions and the applied loads were all considered as unascertained variables. And a structure analysis method based on the unascertained factor method was given. By the mathematics expression of unascertained factor and the arithmetic operation rules of unascertained rational numbers, the computational expressions of the structural displacement response and the element stress response were developed. At last, an example was given, in which the possible values and faith degrees of the unascertained structure responses were obtained. The rationality and validity of the presented method were demonstrated. |