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The objective of the present work is to show how from the 50’s, Felix Candela got to analyze the roof long cylindrical shells in reinforced concrete. It was done from a structural point of view, with calculations based simply on equilibrium equations, with just an objective: to get a safely and easily calculation method, respecting the assignment of reinforced concrete and, therefore, obviating the considerations of compatibility and deformation that could undergo the structure. And he did it in a moment when Elastic Theory of Shells was practically inapplicable when it involved the resolution of eighth order differential equations.  The theory is developed mathematically choosing an example of work of Felix Candela, done by roof long cylindrical shells, and making the necessary structural calculations proposed.

Proceso de cálculo de las cáscaras cilíndricas largas de cubierta en la obra de Félix Candela. El enfoque del equilibrio