INVESTIGADORES
AMBROSINI Ricardo Daniel
artículos
Título:
On free vibration of nonsymmetrical thin-walled beams
Autor/es:
DANIEL AMBROSINI
Revista:
THIN-WALLED STRUCTURES
Editorial:
ELSEVIER SCI LTD
Referencias:
Año: 2009 vol. 47 p. 629 - 636
ISSN:
0263-8231
Resumen:
In this paper, a numericalexperimental study about natural frequencies of doubly unsymmetrical thinwalled
and open cross-section beams is presented. The equations of motion are based on Vlasovs
theory of thin-walled beams, which is modified to include the effects of shear flexibility, rotatory inertia
in the stress resultants and variable cross-sectional properties. The formulation is also applicable to
solid beams, constituting therefore a general theory of coupled flexure and torsion of straight beams.
The differential equations are shown to be particularly suitable for analysis in the frequency domain
using a state variables approach. A simplified theory, which excludes the analysis the warping
constraint, is presented leading to a more simple theory that is used for comparison purposes in this
paper. Finally, free vibration experimental tests about unsymmetrical beams are presented which allow
to verify the theory presented in this paper and provide good quality data that can be used for checking
the accuracy and reliability of different theories.