Abstract
The recently completed hyperbolic paraboloid concrete shell roof for the Ponce Coliseum in Puerto Rico represents a significant thrust forward in the design of shell structures. The shell roof cantilevers 138 ft (measured along the edge beams) making it the world's longest cantilever shell of the HP type. Post-tensioning was used both in the shell membrane and also along the edge beams to control deflections and stresses. In addition, the piers on opposite sides of the shell were post-tensioned beneath the ground to resist the horizontal thrust. The finite element method was used to analyze the structural behavior and to calculate the moments, stresses, and deflections in the shell and edge beams. This article describes the design and construction techniques used in building this shell roof.
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