ON THE FREE VIBRATION OF STIFFENED SHALLOW SHELLS

✍ Scribed by A.N. NAYAK; J.N. BANDYOPADHYAY

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 447 KB
• Volume: 255
• Category: Article
• ISSN: 0022-460X
• DOI: 10.1006/jsvi.2001.4159

✦ Synopsis

A "nite element analysis for free vibration behaviour of doubly curved sti!ened shallow shells is presented. The sti!ened shell element is obtained by the appropriate combinations of the eight-/nine-node doubly curved isoparametric thin shallow shell element with the three-node curved isoparametric beam element. The shell types examined are the elliptic and hyperbolic paraboloids, the hypar and the conoidal shells. The accuracy of the formulation is established by comparing some of the authors' results of speci"c problems with those available in the literature. Numerical results of additional sti!ened shells are also presented to study the e!ects of various parameters of shells and sti!eners such as orientation (i.e., along x-/y-/both x and y directions), type (concentric, eccentric at top and eccentric at bottom) and number of sti!eners, sti!ener depth to shell thickness ratio, and aspect ratio, shallowness and boundary conditions of shells on free vibration characteristics.