Higher-Order Hierarchical Models for the Free Vibration Analysis of Thin-Walled Beams

Table 5

Dimensionless natural frequencies, I-shaped cross section, and .

	Mode I	Mode II	Mode III	Mode IV	Mode V	Mode VI
FEM 3D
FEM 3D
TBT				—	—	—
EBT		—		—	—	—

a: cross section mesh. b: cross section mesh. c: mode not provided by the theory.