الفهرس 
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Abstract
This thesis proposesimethod for determining the effective bre¬adth of vibrating stiffened panels,which is mostly needed in dete¬rmining the response of vibrating panels.
The thesis describes the application of the orthotropic plate method,the transfer matrix method,and the separated stiffener met,- hod in determining the natural frequencies,mode of vibration and other characteristics such as stress,strain,and bending moment,of rectangular cross-stiffened panels.
The panel is considered to be simply supported all a~’ound its edges when n-pplying the orthotropic plate method,while for the other two methods no restrictions were made on longitudinal stiff¬eners,boundary conditions or spacing. The effects of torsional ri¬gidity,shear deflection,and rotary inertia may be included or omi¬tted as desired.
The thesis also includes two approaches for determining the response of crov,stiffened panels when subjected to probabilistic exciting forces,and an investigation about reliability and fatigu¬failure of structures during vibration.
A case study of a rectangular panel stiffened by (3 x 13) cross-stiffeners is treated by each method,and computer programs are included.
The thesis ends with discussions,conclusions and suggestions
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for further work.