The natural vibrations of rectangular plates reinforced by orthogonal ribs

A technique is proposed to determine the fundamental frequencies of vibrations of rectangular plates strengthened by an orthogonal system of ribs. The necessity of allowing for the discrete arrangement of ribs is demonstrated by numerical examples. S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 36, No. 7, pp. 117–122, July, 2000.