Abstract: The finite element analysis methods for platebeam composite structures with random physical parameters under the random loads action are studied. Based on the random factor method, considering the randomness of both the elastic module of the structures and the applied load, the finite element equations of the structures are built, and the computational expressions of the mean value and mean variance of the structural displacement response and stress response are developed by the algebra method. Through examples, the influences of the randomness of the structural physical parameters and loads on the structural displacement and stress response are analyzed, and the rationality and feasibility of presented model and approach are validated.

Key words: plate-beam composite structures, random physical parameters, random factor method, finite element analysis