Influence of Stiff Equatorial Rings on Concrete Spherical Hulls Subjected to Hydrostatic Loading.
Technical rept. Jul 68-Jan 71,
NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF
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Thirteen hollow concrete spheres were assembled from hemispheres fastened together with equatorial joint rings of different stiffness. The joint rings were made from polycarbonate plastic, glass reinforced plastic laminate, aluminum, titanium, low carbon steel, and alloy steel. The spheres were tested to destruction under external hydrostatic loading. Equatorial joints that are either considerably stiffer or more compliant than concrete lower the short-term implosion pressure of the concrete spheres by as much as 27 the glass reinforced plastic joint ring did not significantly reduce the implosion pressure. It is recommended that equatorial joint rings be designed to have a stiffness approximately equal to that of the concrete shell and be made of glass reinforced plastic. If stiffer joint rings are used, the operational pressure should be 30 lower than that of a sphere without a mechanical lock joint mechanism. Author-PL
- Marine Engineering