Vibration of Flanged Beams and Panels

by Satya P. Keshava, (M.ASCE), Assoc. Prof. of Civ. Engrg.; North Dakota State Univ., Fargo, ND,

Serial Information: Journal of the Structural Division, 1973, Vol. 99, Issue 7, Pg. 1681-1686

Document Type: Journal Paper


Considerable attention has been given in recent years to the dynamic performance of structural elements. The dependence of fatigue strength on stress range is well known. Test results on welded plate girders indicate a correlation between tensile fatigue strength and web boundary stress, which in turn is a function of several variables, such as frequency, nature of dynamic load, and girder proportions. This note presents an approximate analysis of the dynamics of a built-up girder, based on the realization that a flanged section behaves essentially like a rectangular composite beam, whose facing layers, representing the flanges, have a higher mass density and flexural stiffness than the web material. The analysis in this note is limited only to free flexural motion of simply supported symmetrical sections

Subject Headings: Plate girders | Ultimate strength | Dynamic loads | Vibration | Flanges | Beams | Panels (structural) | Fatigue tests

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