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Thesis (M.S.)—University of Nebraska—Lincoln, 1962. Department of Civil Engineering.


Copyright 1962, the author. Used by permission.


The purpose of this thesis is to evaluate the redundancies for the various sizes, shapes, and thicknesses of conduits analyzed in order to facilitate the future analysis of any conduit which approximates those studied here. Each of the basic shapes analyzed (see Figure 1) is statically indeterminate to the third degree with regard to the inner forces acting on the structure. Elastic properties of the structure need not be accounted for in the solution of any portion of the structure after the three redundancies are evaluated. The method of virtual work was chosen as the method by which the redundancies would be evaluated. The virtual work equations are derived in the chapter devoted to theory. The moment, thrust, and shear at the crown of the conduit are the redundancies which will be evaluated. The crown shear is zero in all cases studied due to the fact that each conduit is symmetrical about a vertical center line.

The object of this study is to determine coefficients of the moment, thrust, and shear at the crown of the various conduits studied in terms of a specific load type for any wall thickness. The end product of the study is a set of graphs which will chart crown coefficient versus wall thickness for a particular shape of conduit and its loading.

Advisor: George C. Ernst