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Structural Behavior of Circular Concrete Manure Tanks on Compressible Foundations

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2007 ASAE Annual Meeting  074113.(doi:10.13031/2013.23055)
Authors:   Benjamin C Doerge, William A Wallace
Keywords:   Manure tanks, soil-structure interaction, structural design, foundation design, finite element analysis, compressible foundations

Floor slabs for circular concrete manure tanks are frequently designed as non-structural slabs on grade. However, the more compressible the foundation, the more the structural behavior of the floor slab diverges from that of a simple slab on grade. Differential settlement of the foundation induces bending moment and axial tension in the slab, and high bending stresses can be developed in the vicinity of the wall, depending on the degree of restraint provided by the wall-to-floor connection. For this paper, the soil-structure interaction is characterized by means of finite element analyses of both the foundation and the tank. Two methods to calculate bending moment and shear in the floor slab are presented. Finally, design details are presented which provide for an efficient structural system for tanks on compressible foundations.

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