Shakedown of Grids

by Dale G. Eyre, (A.M.ASCE), Asst. Prof. of Civ. Engrg.; Univ. of New Brunswick, Fredericton, NB, Canada,
Theodore V. Galambos, (F.ASCE), Prof. of Civ. Engrg.; Washington Univ., St. Louis, MO,

Serial Information: Journal of the Structural Division, 1973, Vol. 99, Issue 10, Pg. 2049-2060

Document Type: Journal Paper


The simple shakedown theory that employs the assumptions of plastic design is extended to grids in the paper. The grids are continuous over supports of fixed elevation and contain three main girders and three cross beams per span. Torsion in the grid is ignored. After the theoretical analysis, an example is treated for clarification. It is found that the shakedown load for the grid falls between the load which initiates yielding, and the load at which a fully plastic mechanism is formed.

Subject Headings: Grid systems | Plastic design | Girders | Beams | Torsion | Plastics | Load and resistance factor design

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