MULTI-SCALE ANALYSIS OF ALL-COMPOSITE TRUSS CONSIDERING JOINT EFFECTS

The structural multi-scale finite element concept is introduced for improving analysis precision and efficiency of all-composite trusses. The fine modeling joints are embed into the macro truss model by imposing displacements constraints on two points to connect different scale models, and the material properties are given for actual truss preparation process. In order to verify the advantages of the multi-scale finite element model, bending experiment, finite element analysis based on pure beam elements and that based on pure solid elements are conducted respectively. Comparisons of computational accuracies and efficiencies among the above finite element models show that the multi-scale model can obtain a better balance between calculation accuracy and efficiency. The multi-scale finite element method can accurately analyze all-composite truss bearing performances and provide effective local information at the same time. Furthermore, the method is applicable to large-scale composite structures with complex local details.