Textbook
Rigid Frame Formulas
The practical design of statically indeterminate structures is a trial and error process. Because the elastic equations are dependent on the substance, as well as on the form of the proposed structure, it is necessary to assume the size of each member in advance. This is based primarily on the experience of the designer, but these assumptions must then be justified by computation, and, as a rule, more than one trial is necessary to arrive at the final design. The setting-up and solution of the elastic equations for the chosen redundant quantities involve much more work than the analysis of the comparatively simple statically determinate cases. Anything which will facilitate this work is therefore desirable, and such aids are often to be found in the algebraic formulas which are the solutions of the elastic equations in general terms.
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