Stress analysis of a cylindrical shell (axis horizontal) submerged in water and loaded for neutral buoyancy

A stress analysis of a cylindrical shell submerged in water and loaded for neutral buoyancy is presented. From this analysis it is concluded that reinforced concrete shells are structurally practical provided the proper shapes are chosen. The sphere is a particularly practical shape. For reactor enclosures a minimum wall thickness of 4 or 5 ft. is desirable to prevent radiation. Such a structure with a minimum of steel reinforcement is adequate for stress. In relatively short cylinders, longitudinal stress reinforcing would be required to relieve ring stresses, and other shell shapes, such as an oblate spheroid might be more practical. The problem of overcoming the natural buoyancy of a submerged shell is discussed, and it is concluded that the best way to achieve neutral buoyancy is to decrease the free space allowed for equipment and operation. (U.S.)