Abstract
P restressed concrete circular tanks are widely used as water supply reservoirs, sewage digesters, and for storage of such diverse materials as acid, oil, cement, hot effluent from pulp and paper factories, and other applications. Most tanks are cylindrical and ground supported but elevated tanks are used for water supply in areas where local topography is not suitable for natural provision of adequate head for town supply, or where industrial requirements demand short-term provision of large quantities of high pressure water. Such tanks are visually prominent, and aesthetic considerations frequently dictate that more complex shapes than simple elevated cylinders be utilized. Analysis of cylindrical tanks under axisymmetric loads, such as fluid or gas pressure, is covered by standard texts on the design of circular reservoirs, and is only briefly summarized here. Loads are carried by two contributing mechanisms: hoop stress and bending of the wall along the surface generators. Fig. I illustrates the radial deflection of a pinned-base ground supported cylindrical tank under internal fluid pressure, and defines the nomenclature to be used hereinafter. Consideration of compatibility requirements results in the characteristic equation for radial deformation:
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